1
|
Stephan T, Stoldt S, Barbot M, Carney TD, Lange F, Bates M, Bou Dib P, Inamdar K, Shcherbata HR, Meinecke M, Riedel D, Dennerlein S, Rehling P, Jakobs S. Drosophila MIC10b can polymerize into cristae-shaping filaments. Life Sci Alliance 2024; 7:e202302177. [PMID: 38253420 PMCID: PMC10803214 DOI: 10.26508/lsa.202302177] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Revised: 01/08/2024] [Accepted: 01/09/2024] [Indexed: 01/24/2024] Open
Abstract
Cristae are invaginations of the mitochondrial inner membrane that are crucial for cellular energy metabolism. The formation of cristae requires the presence of a protein complex known as MICOS, which is conserved across eukaryotic species. One of the subunits of this complex, MIC10, is a transmembrane protein that supports cristae formation by oligomerization. In Drosophila melanogaster, three MIC10-like proteins with different tissue-specific expression patterns exist. We demonstrate that CG41128/MINOS1b/DmMIC10b is the major MIC10 orthologue in flies. Its loss destabilizes MICOS, disturbs cristae architecture, and reduces the life span and fertility of flies. We show that DmMIC10b has a unique ability to polymerize into bundles of filaments, which can remodel mitochondrial crista membranes. The formation of these filaments relies on conserved glycine and cysteine residues, and can be suppressed by the co-expression of other Drosophila MICOS proteins. These findings provide new insights into the regulation of MICOS in flies, and suggest potential mechanisms for the maintenance of mitochondrial ultrastructure.
Collapse
Affiliation(s)
- Till Stephan
- https://ror.org/03av75f26 Department of NanoBiophotonics, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
- Clinic of Neurology, University Medical Center Göttingen, Göttingen, Germany
| | - Stefan Stoldt
- https://ror.org/03av75f26 Department of NanoBiophotonics, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
- Clinic of Neurology, University Medical Center Göttingen, Göttingen, Germany
- Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen, Göttingen, Germany
| | - Mariam Barbot
- https://ror.org/03av75f26 Department of NanoBiophotonics, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
- Clinic of Neurology, University Medical Center Göttingen, Göttingen, Germany
| | - Travis D Carney
- Institute of Cell Biochemistry, Hannover Medical School, Hanover, Germany
- Mount Desert Island Biological Laboratory, Bar Harbor, ME, USA
| | - Felix Lange
- https://ror.org/03av75f26 Department of NanoBiophotonics, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
- Clinic of Neurology, University Medical Center Göttingen, Göttingen, Germany
| | - Mark Bates
- https://ror.org/03av75f26 Department of NanoBiophotonics, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
- Department of Optical Nanoscopy, Institute for Nanophotonics, Göttingen, Germany
| | - Peter Bou Dib
- https://ror.org/03av75f26 Department of NanoBiophotonics, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
- Clinic of Neurology, University Medical Center Göttingen, Göttingen, Germany
| | - Kaushik Inamdar
- https://ror.org/03av75f26 Department of NanoBiophotonics, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
- Clinic of Neurology, University Medical Center Göttingen, Göttingen, Germany
| | - Halyna R Shcherbata
- Institute of Cell Biochemistry, Hannover Medical School, Hanover, Germany
- Mount Desert Island Biological Laboratory, Bar Harbor, ME, USA
| | - Michael Meinecke
- Biochemistry Center (BZH), Heidelberg University, Heidelberg, Germany
| | - Dietmar Riedel
- Laboratory of Electron Microscopy, Max Planck Institute for Multidisciplinary Science, Göttingen, Germany
| | - Sven Dennerlein
- Department of Cellular Biochemistry, University Medical Center Göttingen, Göttingen, Germany
| | - Peter Rehling
- Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen, Göttingen, Germany
- Department of Cellular Biochemistry, University Medical Center Göttingen, Göttingen, Germany
- Fraunhofer Institute for Translational Medicine and Pharmacology, Translational Neuroinflammation and Automated Microscopy, Göttingen, Germany
- Max Planck Institute for Multidisciplinary Science, Göttingen, Germany
| | - Stefan Jakobs
- https://ror.org/03av75f26 Department of NanoBiophotonics, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
- Clinic of Neurology, University Medical Center Göttingen, Göttingen, Germany
- Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen, Göttingen, Germany
- Fraunhofer Institute for Translational Medicine and Pharmacology, Translational Neuroinflammation and Automated Microscopy, Göttingen, Germany
| |
Collapse
|
2
|
Frieg B, Han M, Giller K, Dienemann C, Riedel D, Becker S, Andreas LB, Griesinger C, Schröder GF. Cryo-EM structures of lipidic fibrils of amyloid-β (1-40). Nat Commun 2024; 15:1297. [PMID: 38351005 PMCID: PMC10864299 DOI: 10.1038/s41467-023-43822-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2023] [Accepted: 11/21/2023] [Indexed: 02/16/2024] Open
Abstract
Alzheimer's disease (AD) is a progressive and incurable neurodegenerative disease characterized by the extracellular deposition of amyloid plaques. Investigation into the composition of these plaques revealed a high amount of amyloid-β (Aβ) fibrils and a high concentration of lipids, suggesting that fibril-lipid interactions may also be relevant for the pathogenesis of AD. Therefore, we grew Aβ40 fibrils in the presence of lipid vesicles and determined their structure by cryo-electron microscopy (cryo-EM) to high resolution. The fold of the major polymorph is similar to the structure of brain-seeded fibrils reported previously. The majority of the lipids are bound to the fibrils, as we show by cryo-EM and NMR spectroscopy. This apparent lipid extraction from vesicles observed here in vitro provides structural insights into potentially disease-relevant fibril-lipid interactions.
Collapse
Affiliation(s)
- Benedikt Frieg
- Institute of Biological Information Processing (IBI-7: Structural Biochemistry) and JuStruct: Jülich Center for Structural Biology, Forschungszentrum Jülich, Jülich, Germany
| | - Mookyoung Han
- Department of NMR-Based Structural Biology, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
| | - Karin Giller
- Department of NMR-Based Structural Biology, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
| | - Christian Dienemann
- Department of Molecular Biology, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
| | - Dietmar Riedel
- Laboratory of Electron Microscopy, Max-Planck-Institute for Multidisciplinary Sciences, Göttingen, Germany
| | - Stefan Becker
- Department of NMR-Based Structural Biology, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany.
| | - Loren B Andreas
- Department of NMR-Based Structural Biology, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany.
| | - Christian Griesinger
- Department of NMR-Based Structural Biology, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany.
- Cluster of Excellence "Multiscale Bioimaging: From Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen, Göttingen, Germany.
| | - Gunnar F Schröder
- Institute of Biological Information Processing (IBI-7: Structural Biochemistry) and JuStruct: Jülich Center for Structural Biology, Forschungszentrum Jülich, Jülich, Germany.
- Physics Department, Heinrich Heine University Düsseldorf, Düsseldorf, Germany.
| |
Collapse
|
3
|
Binotti B, Ninov M, Cepeda AP, Ganzella M, Matti U, Riedel D, Urlaub H, Sambandan S, Jahn R. ATG9 resides on a unique population of small vesicles in presynaptic nerve terminals. Autophagy 2023:1-19. [PMID: 37881948 DOI: 10.1080/15548627.2023.2274204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2023] [Accepted: 10/17/2023] [Indexed: 10/27/2023] Open
Abstract
In neurons, autophagosome biogenesis occurs mainly in distal axons, followed by maturation during retrograde transport. Autophagosomal growth depends on the supply of membrane lipids which requires small vesicles containing ATG9, a lipid scramblase essential for macroautophagy/autophagy. Here, we show that ATG9-containing vesicles are enriched in synapses and resemble synaptic vesicles in size and density. The proteome of ATG9-containing vesicles immuno-isolated from nerve terminals showed conspicuously low levels of trafficking proteins except of the AP2-complex and some enzymes involved in endosomal phosphatidylinositol metabolism. Super resolution microscopy of nerve terminals and isolated vesicles revealed that ATG9-containing vesicles represent a distinct vesicle population with limited overlap not only with synaptic vesicles but also other membranes of the secretory pathway, uncovering a surprising heterogeneity in their membrane composition. Our results are compatible with the view that ATG9-containing vesicles function as lipid shuttles that scavenge membrane lipids from various intracellular membranes to support autophagosome biogenesis.Abbreviations: AP: adaptor related protein complex: ATG2: autophagy related 2; ATG9: autophagy related 9; DNA PAINT: DNA-based point accumulation for imaging in nanoscale topography; DyMIN STED: dynamic minimum stimulated emission depletion; EL: endosome and lysosome; ER: endoplasmic reticulum; GA: Golgi apparatus; iBAQ: intensity based absolute quantification; LAMP: lysosomal-associated membrane protein; M6PR: mannose-6-phosphate receptor, cation dependent; Minflux: minimal photon fluxes; Mito: mitochondria; MS: mass spectrometry; PAS: phagophore assembly site; PM: plasma membrane; Px: peroxisome; RAB26: RAB26, member RAS oncogene family; RAB3A: RAB3A, member RAS oncogene family; RAB5A: RAB5A, member RAS oncogene family; SNARE: soluble N-ethylmaleimide-sensitive-factor attachment receptor; SVs: synaptic vesicles; SYP: synaptophysin; TGN: trans-Golgi network; TRAPP: transport protein particle; VTI1: vesicle transport through interaction with t-SNAREs.
Collapse
Affiliation(s)
- Beyenech Binotti
- Laboratory of Neurobiology, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
- Department of Biochemistry, Biocenter, University of Würzburg, Würzburg, Germany
| | - Momchil Ninov
- Laboratory of Neurobiology, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
- Bioanalytics, Institute of Clinical Chemistry, University Medical Center Göttingen, Germany
- Bioanalytical Mass Spectrometry, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
| | - Andreia P Cepeda
- Bioanalytical Mass Spectrometry, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
| | - Marcelo Ganzella
- Laboratory of Neurobiology, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
| | - Ulf Matti
- Abberior Instruments GmbH, Göttingen, Germany
| | - Dietmar Riedel
- Facility for Transmission Electron Microscopy, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
| | - Henning Urlaub
- Bioanalytics, Institute of Clinical Chemistry, University Medical Center Göttingen, Germany
- Bioanalytical Mass Spectrometry, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
- Cluster of Excellence "Multiscale Bioimaging : from Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen, Göttingen, Germany
| | - Sivakumar Sambandan
- Laboratory of Neurobiology, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
- Synaptic Metal Ion Dynamics and Signalin, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
| | - Reinhard Jahn
- Laboratory of Neurobiology, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
| |
Collapse
|
4
|
Drees L, Schneider S, Riedel D, Schuh R, Behr M. The proteolysis of ZP proteins is essential to control cell membrane structure and integrity of developing tracheal tubes in Drosophila. eLife 2023; 12:e91079. [PMID: 37872795 PMCID: PMC10597583 DOI: 10.7554/elife.91079] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2023] [Accepted: 09/20/2023] [Indexed: 10/25/2023] Open
Abstract
Membrane expansion integrates multiple forces to mediate precise tube growth and network formation. Defects lead to deformations, as found in diseases such as polycystic kidney diseases, aortic aneurysms, stenosis, and tortuosity. We identified a mechanism of sensing and responding to the membrane-driven expansion of tracheal tubes. The apical membrane is anchored to the apical extracellular matrix (aECM) and causes expansion forces that elongate the tracheal tubes. The aECM provides a mechanical tension that balances the resulting expansion forces, with Dumpy being an elastic molecule that modulates the mechanical stress on the matrix during tracheal tube expansion. We show in Drosophila that the zona pellucida (ZP) domain protein Piopio interacts and cooperates with the ZP protein Dumpy at tracheal cells. To resist shear stresses which arise during tube expansion, Piopio undergoes ectodomain shedding by the Matriptase homolog Notopleural, which releases Piopio-Dumpy-mediated linkages between membranes and extracellular matrix. Failure of this process leads to deformations of the apical membrane, tears the apical matrix, and impairs tubular network function. We also show conserved ectodomain shedding of the human TGFβ type III receptor by Notopleural and the human Matriptase, providing novel findings for in-depth analysis of diseases caused by cell and tube shape changes.
Collapse
Affiliation(s)
- Leonard Drees
- Research Group Molecular Organogenesis, Department of Molecular Developmental Biology, Max Planck Institute for Multidisciplinary SciencesGöttingenGermany
| | - Susi Schneider
- Cell biology, Institute for Biology, Leipzig UniversityLeipzigGermany
| | - Dietmar Riedel
- Facility for electron microscopy, Max Planck Institute for Multidisciplinary SciencesGöttingenGermany
| | - Reinhard Schuh
- Research Group Molecular Organogenesis, Department of Molecular Developmental Biology, Max Planck Institute for Multidisciplinary SciencesGöttingenGermany
| | - Matthias Behr
- Cell biology, Institute for Biology, Leipzig UniversityLeipzigGermany
| |
Collapse
|
5
|
Zehnle H, Laso-Pérez R, Lipp J, Riedel D, Benito Merino D, Teske A, Wegener G. Candidatus Alkanophaga archaea from Guaymas Basin hydrothermal vent sediment oxidize petroleum alkanes. Nat Microbiol 2023:10.1038/s41564-023-01400-3. [PMID: 37264141 DOI: 10.1038/s41564-023-01400-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2022] [Accepted: 04/28/2023] [Indexed: 06/03/2023]
Abstract
Methanogenic and methanotrophic archaea produce and consume the greenhouse gas methane, respectively, using the reversible enzyme methyl-coenzyme M reductase (Mcr). Recently, Mcr variants that can activate multicarbon alkanes have been recovered from archaeal enrichment cultures. These enzymes, called alkyl-coenzyme M reductase (Acrs), are widespread in the environment but remain poorly understood. Here we produced anoxic cultures degrading mid-chain petroleum n-alkanes between pentane (C5) and tetradecane (C14) at 70 °C using oil-rich Guaymas Basin sediments. In these cultures, archaea of the genus Candidatus Alkanophaga activate the alkanes with Acrs and completely oxidize the alkyl groups to CO2. Ca. Alkanophaga form a deep-branching sister clade to the methanotrophs ANME-1 and are closely related to the short-chain alkane oxidizers Ca. Syntrophoarchaeum. Incapable of sulfate reduction, Ca. Alkanophaga shuttle electrons released from alkane oxidation to the sulfate-reducing Ca. Thermodesulfobacterium syntrophicum. These syntrophic consortia are potential key players in petroleum degradation in heated oil reservoirs.
Collapse
Affiliation(s)
- Hanna Zehnle
- Max Planck Institute for Marine Microbiology, Bremen, Germany.
- MARUM, Center for Marine Environmental Sciences, University of Bremen, Bremen, Germany.
- Faculty of Geosciences, University of Bremen, Bremen, Germany.
| | - Rafael Laso-Pérez
- MARUM, Center for Marine Environmental Sciences, University of Bremen, Bremen, Germany
- Systems Biology Department, Centro Nacional de Biotecnología (CNB-CSIC), Madrid, Spain
- Biogeochemistry and Microbial Ecology Department, Museo Nacional de Ciencias Naturales (MNCN-CSIC), Madrid, Spain
| | - Julius Lipp
- MARUM, Center for Marine Environmental Sciences, University of Bremen, Bremen, Germany
| | - Dietmar Riedel
- Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
| | - David Benito Merino
- Max Planck Institute for Marine Microbiology, Bremen, Germany
- Faculty of Geosciences, University of Bremen, Bremen, Germany
| | - Andreas Teske
- Department of Earth, Marine and Environmental Sciences, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Gunter Wegener
- Max Planck Institute for Marine Microbiology, Bremen, Germany.
- MARUM, Center for Marine Environmental Sciences, University of Bremen, Bremen, Germany.
| |
Collapse
|
6
|
Brás IC, Khani MH, Vasili E, Möbius W, Riedel D, Parfentev I, Gerhardt E, Fahlbusch C, Urlaub H, Zweckstetter M, Gollisch T, Outeiro TF. Molecular Mechanisms Mediating the Transfer of Disease-Associated Proteins and Effects on Neuronal Activity. J Parkinsons Dis 2022; 12:2397-2422. [PMID: 36278361 DOI: 10.3233/jpd-223516] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
BACKGROUND Various cellular pathways have been implicated in the transfer of disease-related proteins between cells, contributing to disease progression and neurodegeneration. However, the overall effects of protein transfer are still unclear. OBJECTIVE Here, we performed a systematic comparison of basic molecular mechanisms involved in the release of alpha-synuclein, Tau, and huntingtin, and evaluated functional effects upon internalization by receiving cells. METHODS Evaluation of protein release to the extracellular space in a free form and in extracellular vesicles using an optimized ultracentrifugation protocol. The extracellular effects of the proteins and extracellular vesicles in primary neuronal cultures were assessed using multi-channel electrophysiological recordings combined with a customized spike sorting framework. RESULTS We demonstrate cells differentially release free-forms of each protein to the extracellular space. Importantly, neuronal activity is distinctly modulated upon protein internalization in primary cortical cultures. In addition, these disease-related proteins also occur in extracellular vesicles, and are enriched in ectosomes. Internalization of ectosomes and exosomes by primary microglial or astrocytic cells elicits the production of pro-inflammatory cytokines, and modifies spontaneous electrical activity in neurons. OBJECTIVE Overall, our study demonstrates that released proteins can have detrimental effects for surrounding cells, and suggests protein release pathways may be exploited as therapeutic targets in different neurodegenerative diseases.
Collapse
Affiliation(s)
- Inês C Brás
- Department of Experimental Neurodegeneration, Center for Biostructural Imaging of Neurodegeneration, University Medical Center Göttingen, Göttingen, Germany
| | - Mohammad H Khani
- Department of Ophthalmology, University Medical Center Göttingen, Göttingen, Germany
| | - Eftychia Vasili
- Department of Experimental Neurodegeneration, Center for Biostructural Imaging of Neurodegeneration, University Medical Center Göttingen, Göttingen, Germany
| | - Wiebke Möbius
- Department of Neurogenetics, Max Planck Institute for Experimental Medicine, Göttingen, Germany.,Electron Microscopy Core Unit, Max Planck Institute for Experimental Medicine, Göttingen, Germany
| | - Dietmar Riedel
- Laboratory of Electron Microscopy, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Iwan Parfentev
- Research Group Bioanalytical Mass Spectrometry, Max-Planck-Institute for Biophysical Chemistry, Göttingen, Germany
| | - Ellen Gerhardt
- Department of Experimental Neurodegeneration, Center for Biostructural Imaging of Neurodegeneration, University Medical Center Göttingen, Göttingen, Germany
| | - Christiane Fahlbusch
- Department of Experimental Neurodegeneration, Center for Biostructural Imaging of Neurodegeneration, University Medical Center Göttingen, Göttingen, Germany
| | - Henning Urlaub
- Research Group Bioanalytical Mass Spectrometry, Max-Planck-Institute for Biophysical Chemistry, Göttingen, Germany.,Bioanalytics, Institute of Clinical Chemistry, University Medical Center Göttingen, Göttingen, Germany
| | - Markus Zweckstetter
- German Center for Neurodegenerative Diseases (DZNE), Göttingen, Germany.,Department for NMR-Based Structural Biology, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany.,Department of Neurology, University Medical Center Göttingen, Göttingen, Germany
| | - Tim Gollisch
- Department of Ophthalmology, University Medical Center Göttingen, Göttingen, Germany
| | - Tiago F Outeiro
- Department of Experimental Neurodegeneration, Center for Biostructural Imaging of Neurodegeneration, University Medical Center Göttingen, Göttingen, Germany.,Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany.,Translational and Clinical Research Institute, Faculty of Medical Sciences, Newcastle University, United Kingdom.,Scientific Employee with an Honorary Contract at German Center for Neurodegenerative Diseases (DZNE), Göttingen, Germany
| |
Collapse
|
7
|
Wu Z, Berlemann LA, Bader V, Sehr DA, Dawin E, Covallero A, Meschede J, Angersbach L, Showkat C, Michaelis JB, Münch C, Rieger B, Namgaladze D, Herrera MG, Fiesel FC, Springer W, Mendes M, Stepien J, Barkovits K, Marcus K, Sickmann A, Dittmar G, Busch KB, Riedel D, Brini M, Tatzelt J, Cali T, Winklhofer KF. LUBAC assembles a ubiquitin signaling platform at mitochondria for signal amplification and transport of NF-κB to the nucleus. EMBO J 2022; 41:e112006. [PMID: 36398858 PMCID: PMC9753471 DOI: 10.15252/embj.2022112006] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2022] [Revised: 10/20/2022] [Accepted: 10/25/2022] [Indexed: 11/19/2022] Open
Abstract
Mitochondria are increasingly recognized as cellular hubs to orchestrate signaling pathways that regulate metabolism, redox homeostasis, and cell fate decisions. Recent research revealed a role of mitochondria also in innate immune signaling; however, the mechanisms of how mitochondria affect signal transduction are poorly understood. Here, we show that the NF-κB pathway activated by TNF employs mitochondria as a platform for signal amplification and shuttling of activated NF-κB to the nucleus. TNF treatment induces the recruitment of HOIP, the catalytic component of the linear ubiquitin chain assembly complex (LUBAC), and its substrate NEMO to the outer mitochondrial membrane, where M1- and K63-linked ubiquitin chains are generated. NF-κB is locally activated and transported to the nucleus by mitochondria, leading to an increase in mitochondria-nucleus contact sites in a HOIP-dependent manner. Notably, TNF-induced stabilization of the mitochondrial kinase PINK1 furthermore contributes to signal amplification by antagonizing the M1-ubiquitin-specific deubiquitinase OTULIN. Overall, our study reveals a role for mitochondria in amplifying TNF-mediated NF-κB activation, both serving as a signaling platform, as well as a transport mode for activated NF-κB to the nuclear.
Collapse
Affiliation(s)
- Zhixiao Wu
- Department Molecular Cell Biology, Institute of Biochemistry and PathobiochemistryRuhr University BochumBochumGermany
| | - Lena A Berlemann
- Department Molecular Cell Biology, Institute of Biochemistry and PathobiochemistryRuhr University BochumBochumGermany
| | - Verian Bader
- Department Molecular Cell Biology, Institute of Biochemistry and PathobiochemistryRuhr University BochumBochumGermany
- Department Biochemistry of Neurodegenerative Diseases, Institute of Biochemistry and PathobiochemistryRuhr University BochumBochumGermany
| | - Dominik A Sehr
- Department Molecular Cell Biology, Institute of Biochemistry and PathobiochemistryRuhr University BochumBochumGermany
| | - Eva Dawin
- Department Molecular Cell Biology, Institute of Biochemistry and PathobiochemistryRuhr University BochumBochumGermany
- Leibniz‐Institut für Analytische Wissenschaften—ISAS—e.VDortmundGermany
| | | | - Jens Meschede
- Department Molecular Cell Biology, Institute of Biochemistry and PathobiochemistryRuhr University BochumBochumGermany
| | - Lena Angersbach
- Department Molecular Cell Biology, Institute of Biochemistry and PathobiochemistryRuhr University BochumBochumGermany
| | - Cathrin Showkat
- Department Molecular Cell Biology, Institute of Biochemistry and PathobiochemistryRuhr University BochumBochumGermany
| | - Jonas B Michaelis
- Faculty of Medicine, Institute of Biochemistry IIGoethe University FrankfurtFrankfurt am MainGermany
| | - Christian Münch
- Faculty of Medicine, Institute of Biochemistry IIGoethe University FrankfurtFrankfurt am MainGermany
| | - Bettina Rieger
- Institute for Integrative Cell Biology and Physiology, Faculty of BiologyUniversity of MünsterMünsterGermany
| | - Dmitry Namgaladze
- Institute of Biochemistry I, Faculty of MedicineGoethe‐University FrankfurtFrankfurtGermany
| | - Maria Georgina Herrera
- Department Molecular Cell Biology, Institute of Biochemistry and PathobiochemistryRuhr University BochumBochumGermany
| | - Fabienne C Fiesel
- Department of NeuroscienceMayo ClinicJacksonvilleFLUSA
- Neuroscience PhD ProgramMayo Clinic Graduate School of Biomedical SciencesJacksonvilleFLUSA
| | - Wolfdieter Springer
- Department of NeuroscienceMayo ClinicJacksonvilleFLUSA
- Neuroscience PhD ProgramMayo Clinic Graduate School of Biomedical SciencesJacksonvilleFLUSA
| | - Marta Mendes
- Proteomics of Cellular Signaling, Department of Infection and ImmunityLuxembourg Institute of HealthStrassenLuxembourg
| | - Jennifer Stepien
- Medizinisches Proteom‐CenterRuhr‐Universität BochumBochumGermany
- Medical Proteome Analysis, Center for Protein Diagnostics (PRODI)Ruhr‐University BochumBochumGermany
| | - Katalin Barkovits
- Medizinisches Proteom‐CenterRuhr‐Universität BochumBochumGermany
- Medical Proteome Analysis, Center for Protein Diagnostics (PRODI)Ruhr‐University BochumBochumGermany
| | - Katrin Marcus
- Medizinisches Proteom‐CenterRuhr‐Universität BochumBochumGermany
- Medical Proteome Analysis, Center for Protein Diagnostics (PRODI)Ruhr‐University BochumBochumGermany
| | - Albert Sickmann
- Leibniz‐Institut für Analytische Wissenschaften—ISAS—e.VDortmundGermany
| | - Gunnar Dittmar
- Proteomics of Cellular Signaling, Department of Infection and ImmunityLuxembourg Institute of HealthStrassenLuxembourg
- Department of Life Sciences and MedicineUniversity of LuxembourgBelvauxLuxembourg
| | - Karin B Busch
- Institute for Integrative Cell Biology and Physiology, Faculty of BiologyUniversity of MünsterMünsterGermany
| | - Dietmar Riedel
- Laboratory for Electron MicroscopyMax Planck Institute for Multidisciplinary SciencesGöttingenGermany
| | - Marisa Brini
- Department of BiologyUniversity of PaduaPaduaItaly
- Centro Studi per la Neurodegenerazione (CESNE)University of PadovaPaduaItaly
| | - Jörg Tatzelt
- Department Biochemistry of Neurodegenerative Diseases, Institute of Biochemistry and PathobiochemistryRuhr University BochumBochumGermany
- RESOLV Cluster of ExcellenceRuhr University BochumBochumGermany
| | - Tito Cali
- Department of Biomedical SciencesUniversity of PaduaPaduaItaly
- Centro Studi per la Neurodegenerazione (CESNE)University of PadovaPaduaItaly
- Padua Neuroscience Center (PNC)University of PaduaPaduaItaly
| | - Konstanze F Winklhofer
- Department Molecular Cell Biology, Institute of Biochemistry and PathobiochemistryRuhr University BochumBochumGermany
- RESOLV Cluster of ExcellenceRuhr University BochumBochumGermany
| |
Collapse
|
8
|
Brás IC, Khani MH, Riedel D, Parfentev I, Gerhardt E, van Riesen C, Urlaub H, Gollisch T, Outeiro TF. Ectosomes and exosomes modulate neuronal spontaneous activity. J Proteomics 2022; 269:104721. [PMID: 36089191 DOI: 10.1016/j.jprot.2022.104721] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2022] [Revised: 07/08/2022] [Accepted: 09/02/2022] [Indexed: 12/19/2022]
Abstract
Extracellular vesicles (EVs) are important mediators in intercellular communication. However, understanding the biological origin and functional effects of EVs subtypes has been challenging due to the moderate differences in their physical properties and absence of reliable markers. Here, we characterize the proteomes of ectosomes and exosomes using an improved differential ultracentrifugation protocol and quantitative proteomics. Our analyses revealed singular proteomic profiles for ectosomes and exosomes that enabled us to establish specific protein markers that can be used for their biochemical distinction. Cytoskeleton and glycolytic proteins are distinctively present in ectosomes, while endosomal sorting complexes proteins and tetraspanins are enriched in exosomes. Furthermore, annexin-A2 was identified as a specific marker for ectosomes derived from cell media and human cerebrospinal fluid. Expression of EGFP as a cytosolic reporter leads to its incorporation in EVs and enables their imaging with higher resolution. Assessment of neuronal network activity using multi-electrode array recordings demonstrated that spontaneous neuronal activity can be modulated by EVs. Ectosomes and exosomes internalization in neuronal cells disrupted their regular synchronized bursting activity, resulting in overall lower and more disorganized spiking activity. Our findings suggest that EVs cargoes reflect core intracellular processes, and their functional properties might regulate basic biological and pathological processes. SIGNIFICANCE: This article presents novel approaches for studying the origin, composition, and biological effects in neuronal activity of ectosomes and exosomes. Our findings suggest that EVs cargoes reflect core intracellular processes, and their functional properties might regulate basic biological and pathological processes. Ultimately, our study also forms the foundation for future biomarker studies and for the understanding of the molecular basis of different diseases.
Collapse
Affiliation(s)
- Inês C Brás
- Department of Experimental Neurodegeneration, Center for Biostructural Imaging of Neurodegeneration, University Medical Center Göttingen, 37073 Göttingen, Germany
| | - Mohammad H Khani
- Department of Ophthalmology, University Medical Center Göttingen, 37073 Göttingen, Germany
| | - Dietmar Riedel
- Laboratory of Electron Microscopy, Max Planck Institute for Biophysical Chemistry, 37075 Göttingen, Germany
| | - Iwan Parfentev
- Research Group Bioanalytical Mass Spectrometry, Max-Planck-Institute for Biophysical Chemistry, 37077 Göttingen, Germany
| | - Ellen Gerhardt
- Department of Experimental Neurodegeneration, Center for Biostructural Imaging of Neurodegeneration, University Medical Center Göttingen, 37073 Göttingen, Germany
| | - Christoph van Riesen
- Department of Neurology, University Medical Center Göttingen, 37075 Göttingen, Germany; German Center for Neurodegenerative Diseases (DZNE), 53127 Bonn, Germany
| | - Henning Urlaub
- Research Group Bioanalytical Mass Spectrometry, Max-Planck-Institute for Biophysical Chemistry, 37077 Göttingen, Germany; Bioanalytics, Institute of Clinical Chemistry, University Medical Center Göttingen, 37075 Göttingen, Germany
| | - Tim Gollisch
- Department of Ophthalmology, University Medical Center Göttingen, 37073 Göttingen, Germany
| | - Tiago F Outeiro
- Department of Experimental Neurodegeneration, Center for Biostructural Imaging of Neurodegeneration, University Medical Center Göttingen, 37073 Göttingen, Germany; Max Planck Institute for Multidisciplinary Sciences, 37075 Göttingen, Germany; Translational and Clinical Research Institute, Faculty of Medical Sciences, Newcastle University, Newcastle NE2 4HH, United Kingdom; Scientific employee with an honorary contract at German Center for Neurodegenerative Diseases (DZNE), 37075 Göttingen, Germany.
| |
Collapse
|
9
|
Bock-Bierbaum T, Funck K, Wollweber F, Lisicki E, von der Malsburg K, von der Malsburg A, Laborenz J, Noel JK, Hessenberger M, Jungbluth S, Bernert C, Kunz S, Riedel D, Lilie H, Jakobs S, van der Laan M, Daumke O. Structural insights into crista junction formation by the Mic60-Mic19 complex. Sci Adv 2022; 8:eabo4946. [PMID: 36044574 PMCID: PMC9432830 DOI: 10.1126/sciadv.abo4946] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/07/2022] [Accepted: 07/15/2022] [Indexed: 06/15/2023]
Abstract
Mitochondrial cristae membranes are the oxidative phosphorylation sites in cells. Crista junctions (CJs) form the highly curved neck regions of cristae and are thought to function as selective entry gates into the cristae space. Little is known about how CJs are generated and maintained. We show that the central coiled-coil (CC) domain of the mitochondrial contact site and cristae organizing system subunit Mic60 forms an elongated, bow tie-shaped tetrameric assembly. Mic19 promotes Mic60 tetramerization via a conserved interface between the Mic60 mitofilin and Mic19 CHCH (CC-helix-CC-helix) domains. Dimerization of mitofilin domains exposes a crescent-shaped membrane-binding site with convex curvature tailored to interact with the curved CJ neck. Our study suggests that the Mic60-Mic19 subcomplex traverses CJs as a molecular strut, thereby controlling CJ architecture and function.
Collapse
Affiliation(s)
- Tobias Bock-Bierbaum
- Structural Biology, Max Delbrück Center for Molecular Medicine in the Helmholtz Association (MDC), Berlin, Germany
| | - Kathrin Funck
- Structural Biology, Max Delbrück Center for Molecular Medicine in the Helmholtz Association (MDC), Berlin, Germany
- Institute of Chemistry and Biochemistry, Freie Universität Berlin, Berlin, Germany
| | - Florian Wollweber
- Medical Biochemistry and Molecular Biology, Center for Molecular Signaling (PZMS), Saarland University Medical School, Homburg, Saarland, Germany
| | - Elisa Lisicki
- Structural Biology, Max Delbrück Center for Molecular Medicine in the Helmholtz Association (MDC), Berlin, Germany
- Institute of Chemistry and Biochemistry, Freie Universität Berlin, Berlin, Germany
| | - Karina von der Malsburg
- Medical Biochemistry and Molecular Biology, Center for Molecular Signaling (PZMS), Saarland University Medical School, Homburg, Saarland, Germany
| | - Alexander von der Malsburg
- Medical Biochemistry and Molecular Biology, Center for Molecular Signaling (PZMS), Saarland University Medical School, Homburg, Saarland, Germany
| | - Janina Laborenz
- Medical Biochemistry and Molecular Biology, Center for Molecular Signaling (PZMS), Saarland University Medical School, Homburg, Saarland, Germany
| | - Jeffrey K. Noel
- Structural Biology, Max Delbrück Center for Molecular Medicine in the Helmholtz Association (MDC), Berlin, Germany
| | - Manuel Hessenberger
- Structural Biology, Max Delbrück Center for Molecular Medicine in the Helmholtz Association (MDC), Berlin, Germany
| | - Sibylle Jungbluth
- Medical Biochemistry and Molecular Biology, Center for Molecular Signaling (PZMS), Saarland University Medical School, Homburg, Saarland, Germany
| | - Carola Bernert
- Structural Biology, Max Delbrück Center for Molecular Medicine in the Helmholtz Association (MDC), Berlin, Germany
| | - Séverine Kunz
- Technology Platform for Electron Microscopy, Max Delbrück Center for Molecular Medicine in the Helmholtz Association (MDC), Berlin, Germany
| | - Dietmar Riedel
- Laboratory of Electron Microscopy, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Hauke Lilie
- Institute of Biochemistry and Biotechnology, Section of Protein Biochemistry, Martin Luther University Halle-Wittenberg, Halle/Saale, Germany
| | - Stefan Jakobs
- Research Group Mitochondrial Structure and Dynamics, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany
- Clinic for Neurology, University Medical Center Göttingen, Göttingen, Germany
- Translational Neuroinflammation and Automated Microscopy, Fraunhofer Institute for Translational Medicine and Pharmacology ITMP, Göttingen, Germany
| | - Martin van der Laan
- Medical Biochemistry and Molecular Biology, Center for Molecular Signaling (PZMS), Saarland University Medical School, Homburg, Saarland, Germany
| | - Oliver Daumke
- Structural Biology, Max Delbrück Center for Molecular Medicine in the Helmholtz Association (MDC), Berlin, Germany
- Institute of Chemistry and Biochemistry, Freie Universität Berlin, Berlin, Germany
| |
Collapse
|
10
|
Rostam N, Goloborodko A, Riemer S, Hertel A, Riedel D, Vorbrüggen G, Dosch R. The germ plasm is anchored at the cleavage furrows through interaction with tight junctions in the early zebrafish embryo. Development 2022; 149:275789. [DOI: 10.1242/dev.200465] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Accepted: 06/06/2022] [Indexed: 11/20/2022]
Abstract
ABSTRACT
The zebrafish germline is specified during early embryogenesis by inherited maternal RNAs and proteins collectively called germ plasm. Only the cells containing germ plasm will become part of the germline, whereas the other cells will commit to somatic cell fates. Therefore, proper localization of germ plasm is key for germ cell specification and its removal is crucial for the development of the soma. The molecular mechanism underlying this process in vertebrates is largely unknown. Here, we show that germ plasm localization in zebrafish is similar to that in Xenopus but distinct from Drosophila. We identified non muscle myosin II (NMII) and tight junction (TJ) components, such as ZO2 and claudin-d (Cldn-d) as interaction candidates of Bucky ball (Buc), which is the germ plasm organizer in zebrafish. Remarkably, we also found that TJ protein ZO1 colocalizes with germ plasm, and electron microscopy of zebrafish embryos uncovered TJ-like structures at the cleavage furrows where the germ plasm is anchored. In addition, injection of the TJ receptor Cldn-d produced extra germ plasm aggregates, whereas expression of a dominant-negative version inhibited germ plasm aggregate formation. Our findings support for the first time a role for TJs in germ plasm localization.
Collapse
Affiliation(s)
- Nadia Rostam
- Institute of Human Genetics, University Medical Center 1 , 37073 Göttingen , Germany
- Johann-Friedrich-Blumenbach Institute of Zoology and Anthropology, Göttingen Center of Molecular Biosciences, University of Göttingen 2 Department of Developmental Biology , , 37077 Göttingen , Germany
| | - Alexander Goloborodko
- Institute for Developmental Biochemistry, University Medical Center 3 , 37077 Göttingen , Germany
| | - Stephan Riemer
- Institute for Developmental Biochemistry, University Medical Center 3 , 37077 Göttingen , Germany
| | - Andres Hertel
- Max Planck Institute for Biophysical Chemistry 4 Department of Molecular Developmental Biology , , 37077 Göttingen , Germany
| | - Dietmar Riedel
- Max Planck Institute for Biophysical Chemistry 5 Laboratory of Electron Microscopy , , 37077 Göttingen , Germany
| | - Gerd Vorbrüggen
- Johann-Friedrich-Blumenbach Institute of Zoology and Anthropology, Göttingen Center of Molecular Biosciences, University of Göttingen 2 Department of Developmental Biology , , 37077 Göttingen , Germany
- Max Planck Institute for Biophysical Chemistry 4 Department of Molecular Developmental Biology , , 37077 Göttingen , Germany
| | - Roland Dosch
- Institute of Human Genetics, University Medical Center 1 , 37073 Göttingen , Germany
- Institute for Developmental Biochemistry, University Medical Center 3 , 37077 Göttingen , Germany
| |
Collapse
|
11
|
Grabner CP, Jansen I, Neef J, Weihs T, Schmidt R, Riedel D, Wurm CA, Moser T. Resolving the molecular architecture of the photoreceptor active zone with 3D-MINFLUX. Sci Adv 2022; 8:eabl7560. [PMID: 35857490 PMCID: PMC9286502 DOI: 10.1126/sciadv.abl7560] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Cells assemble macromolecular complexes into scaffoldings that serve as substrates for catalytic processes. Years of molecular neurobiology research indicate that neurotransmission depends on such optimization strategies. However, the molecular topography of the presynaptic active zone (AZ), where transmitter is released upon synaptic vesicle (SV) fusion, remains to be visualized. Therefore, we implemented MINFLUX optical nanoscopy to resolve the AZ of rod photoreceptors. This was facilitated by a novel sample immobilization technique that we name heat-assisted rapid dehydration (HARD), wherein a thin layer of rod synaptic terminals (spherules) was transferred onto glass coverslips from fresh retinal slices. Rod ribbon AZs were readily immunolabeled and imaged in 3D with a precision of a few nanometers. Our 3D-MINFLUX results indicate that the SV release site in rods is a molecular complex of bassoon-RIM2-ubMunc13-2-Cav1.4, which repeats longitudinally on both sides of the ribbon.
Collapse
Affiliation(s)
- Chad P. Grabner
- Institute for Auditory Neuroscience, University Medical Center Göttingen, 37075 Göttingen, Germany
- Auditory Neuroscience and Synaptic Nanophysiology Group, Max Planck Institute for Multidisciplinary Sciences, 37077 Göttingen, Germany
- Collaborative Research Center 1286, University of Göttingen, Göttingen, Germany
- Cluster of Excellence “Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells”, University of Göttingen, 37075 Göttingen, Germany
- Corresponding author. (C.P.G.); (C.A.W.); (T.M.)
| | - Isabelle Jansen
- Abberior Instruments, Hans-Adolf-Krebs-Weg 1, 37077 Göttingen, Germany
| | - Jakob Neef
- Institute for Auditory Neuroscience, University Medical Center Göttingen, 37075 Göttingen, Germany
- Auditory Neuroscience and Synaptic Nanophysiology Group, Max Planck Institute for Multidisciplinary Sciences, 37077 Göttingen, Germany
- Collaborative Research Center 1286, University of Göttingen, Göttingen, Germany
- Cluster of Excellence “Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells”, University of Göttingen, 37075 Göttingen, Germany
| | - Tobias Weihs
- Abberior Instruments, Hans-Adolf-Krebs-Weg 1, 37077 Göttingen, Germany
| | - Roman Schmidt
- Abberior Instruments, Hans-Adolf-Krebs-Weg 1, 37077 Göttingen, Germany
| | - Dietmar Riedel
- Laboratory of Electron Microscopy, Max Planck Institute for Multidisciplinary Sciences, 37077 Göttingen, Germany
| | - Christian A. Wurm
- Abberior Instruments, Hans-Adolf-Krebs-Weg 1, 37077 Göttingen, Germany
- Corresponding author. (C.P.G.); (C.A.W.); (T.M.)
| | - Tobias Moser
- Institute for Auditory Neuroscience, University Medical Center Göttingen, 37075 Göttingen, Germany
- Auditory Neuroscience and Synaptic Nanophysiology Group, Max Planck Institute for Multidisciplinary Sciences, 37077 Göttingen, Germany
- Collaborative Research Center 1286, University of Göttingen, Göttingen, Germany
- Cluster of Excellence “Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells”, University of Göttingen, 37075 Göttingen, Germany
- Corresponding author. (C.P.G.); (C.A.W.); (T.M.)
| |
Collapse
|
12
|
Wildung M, Herr C, Riedel D, Wiedwald C, Moiseenko A, Ramírez F, Tasena H, Heimerl M, Alevra M, Movsisyan N, Schuldt M, Volceanov-Hahn L, Provoost S, Nöthe-Menchen T, Urrego D, Freytag B, Wallmeier J, Beisswenger C, Bals R, van den Berge M, Timens W, Hiemstra PS, Brandsma CA, Maes T, Andreas S, Heijink IH, Pardo LA, Lizé M. miR449 Protects Airway Regeneration by Controlling AURKA/HDAC6-Mediated Ciliary Disassembly. Int J Mol Sci 2022; 23:ijms23147749. [PMID: 35887096 PMCID: PMC9320302 DOI: 10.3390/ijms23147749] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2022] [Revised: 07/08/2022] [Accepted: 07/10/2022] [Indexed: 01/25/2023] Open
Abstract
Airway mucociliary regeneration and function are key players for airway defense and are impaired in chronic obstructive pulmonary disease (COPD). Using transcriptome analysis in COPD-derived bronchial biopsies, we observed a positive correlation between cilia-related genes and microRNA-449 (miR449). In vitro, miR449 was strongly increased during airway epithelial mucociliary differentiation. In vivo, miR449 was upregulated during recovery from chemical or infective insults. miR0449−/− mice (both alleles are deleted) showed impaired ciliated epithelial regeneration after naphthalene and Haemophilus influenzae exposure, accompanied by more intense inflammation and emphysematous manifestations of COPD. The latter occurred spontaneously in aged miR449−/− mice. We identified Aurora kinase A and its effector target HDAC6 as key mediators in miR449-regulated ciliary homeostasis and epithelial regeneration. Aurora kinase A is downregulated upon miR449 overexpression in vitro and upregulated in miR449−/− mouse lungs. Accordingly, imaging studies showed profoundly altered cilia length and morphology accompanied by reduced mucociliary clearance. Pharmacological inhibition of HDAC6 rescued cilia length and coverage in miR449−/− cells, consistent with its tubulin-deacetylating function. Altogether, our study establishes a link between miR449, ciliary dysfunction, and COPD pathogenesis.
Collapse
Affiliation(s)
- Merit Wildung
- Molecular & Experimental Pneumology Group, Clinic for Cardiology and Pneumology, University Medical Center Goettingen, 37075 Gottingen, Germany; (M.W.); (C.W.); (M.H.); (L.V.-H.); (S.A.)
- Molecular Oncology, University Medical Center Goettingen, 37077 Goettingen, Germany; (M.S.); (B.F.)
| | - Christian Herr
- Department of Internal Medicine V, Saarland University, 66421 Homburg, Germany; (C.H.); (C.B.); (R.B.)
| | - Dietmar Riedel
- Laboratory for Electron Microscopy, Max Planck Institute for Multidisciplinary Sciences, 37075 Goettingen, Germany;
| | - Cornelia Wiedwald
- Molecular & Experimental Pneumology Group, Clinic for Cardiology and Pneumology, University Medical Center Goettingen, 37075 Gottingen, Germany; (M.W.); (C.W.); (M.H.); (L.V.-H.); (S.A.)
- Molecular Oncology, University Medical Center Goettingen, 37077 Goettingen, Germany; (M.S.); (B.F.)
| | - Alena Moiseenko
- Immunology & Respiratory Department, Boehringer Ingelheim Pharma GmbH, 88400 Biberach an der Riss, Germany;
| | - Fidel Ramírez
- Global Computational Biology and Digital Sciences Department, Boehringer Ingelheim Pharma GmbH, 88400 Biberach an der Riss, Germany;
| | - Hataitip Tasena
- Department of Pathology and Medical Biology, University Medical Center Groningen, University of Groningen, 9712 Groningen, The Netherlands; (H.T.); (W.T.); (C.-A.B.); (I.H.H.)
- Groningen Research Institute for Asthma and COPD, University Medical Center Groningen, University of Groningen, 9712 Groningen, The Netherlands;
| | - Maren Heimerl
- Molecular & Experimental Pneumology Group, Clinic for Cardiology and Pneumology, University Medical Center Goettingen, 37075 Gottingen, Germany; (M.W.); (C.W.); (M.H.); (L.V.-H.); (S.A.)
- Molecular Oncology, University Medical Center Goettingen, 37077 Goettingen, Germany; (M.S.); (B.F.)
| | - Mihai Alevra
- Institute of Neuro- and Sensory Physiology, Goettingen University, 37073 Goettingen, Germany;
| | - Naira Movsisyan
- Oncophysiology Group, Max Planck Institute for Multidisciplinary Sciences, 37075 Goettingen, Germany; (N.M.); (D.U.); (L.A.P.)
| | - Maike Schuldt
- Molecular Oncology, University Medical Center Goettingen, 37077 Goettingen, Germany; (M.S.); (B.F.)
| | - Larisa Volceanov-Hahn
- Molecular & Experimental Pneumology Group, Clinic for Cardiology and Pneumology, University Medical Center Goettingen, 37075 Gottingen, Germany; (M.W.); (C.W.); (M.H.); (L.V.-H.); (S.A.)
| | - Sharen Provoost
- Laboratory for Translational Research in Obstructive Pulmonary Diseases, Department of Respiratory Medicine, Ghent University Hospital, 9000 Ghent, Belgium; (S.P.); (T.M.)
| | - Tabea Nöthe-Menchen
- Department of General Pediatrics, University Hospital Muenster, 48149 Muenster, Germany; (T.N.-M.); (J.W.)
| | - Diana Urrego
- Oncophysiology Group, Max Planck Institute for Multidisciplinary Sciences, 37075 Goettingen, Germany; (N.M.); (D.U.); (L.A.P.)
| | - Bernard Freytag
- Molecular Oncology, University Medical Center Goettingen, 37077 Goettingen, Germany; (M.S.); (B.F.)
| | - Julia Wallmeier
- Department of General Pediatrics, University Hospital Muenster, 48149 Muenster, Germany; (T.N.-M.); (J.W.)
| | - Christoph Beisswenger
- Department of Internal Medicine V, Saarland University, 66421 Homburg, Germany; (C.H.); (C.B.); (R.B.)
| | - Robert Bals
- Department of Internal Medicine V, Saarland University, 66421 Homburg, Germany; (C.H.); (C.B.); (R.B.)
| | - Maarten van den Berge
- Groningen Research Institute for Asthma and COPD, University Medical Center Groningen, University of Groningen, 9712 Groningen, The Netherlands;
- Department of Pulmonology, University Medical Center Groningen, University of Groningen, 9712 Groningen, The Netherlands
| | - Wim Timens
- Department of Pathology and Medical Biology, University Medical Center Groningen, University of Groningen, 9712 Groningen, The Netherlands; (H.T.); (W.T.); (C.-A.B.); (I.H.H.)
- Groningen Research Institute for Asthma and COPD, University Medical Center Groningen, University of Groningen, 9712 Groningen, The Netherlands;
| | - Pieter S. Hiemstra
- Department of Pulmonology, Leiden University Medical Centre, 2333 Leiden, The Netherlands;
| | - Corry-Anke Brandsma
- Department of Pathology and Medical Biology, University Medical Center Groningen, University of Groningen, 9712 Groningen, The Netherlands; (H.T.); (W.T.); (C.-A.B.); (I.H.H.)
- Groningen Research Institute for Asthma and COPD, University Medical Center Groningen, University of Groningen, 9712 Groningen, The Netherlands;
| | - Tania Maes
- Laboratory for Translational Research in Obstructive Pulmonary Diseases, Department of Respiratory Medicine, Ghent University Hospital, 9000 Ghent, Belgium; (S.P.); (T.M.)
| | - Stefan Andreas
- Molecular & Experimental Pneumology Group, Clinic for Cardiology and Pneumology, University Medical Center Goettingen, 37075 Gottingen, Germany; (M.W.); (C.W.); (M.H.); (L.V.-H.); (S.A.)
| | - Irene H. Heijink
- Department of Pathology and Medical Biology, University Medical Center Groningen, University of Groningen, 9712 Groningen, The Netherlands; (H.T.); (W.T.); (C.-A.B.); (I.H.H.)
- Groningen Research Institute for Asthma and COPD, University Medical Center Groningen, University of Groningen, 9712 Groningen, The Netherlands;
- Department of Pulmonology, University Medical Center Groningen, University of Groningen, 9712 Groningen, The Netherlands
| | - Luis A. Pardo
- Oncophysiology Group, Max Planck Institute for Multidisciplinary Sciences, 37075 Goettingen, Germany; (N.M.); (D.U.); (L.A.P.)
| | - Muriel Lizé
- Molecular & Experimental Pneumology Group, Clinic for Cardiology and Pneumology, University Medical Center Goettingen, 37075 Gottingen, Germany; (M.W.); (C.W.); (M.H.); (L.V.-H.); (S.A.)
- Molecular Oncology, University Medical Center Goettingen, 37077 Goettingen, Germany; (M.S.); (B.F.)
- Immunology & Respiratory Department, Boehringer Ingelheim Pharma GmbH, 88400 Biberach an der Riss, Germany;
- Correspondence:
| |
Collapse
|
13
|
Upmanyu N, Jin J, Emde HVD, Ganzella M, Bösche L, Malviya VN, Zhuleku E, Politi AZ, Ninov M, Silbern I, Leutenegger M, Urlaub H, Riedel D, Preobraschenski J, Milosevic I, Hell SW, Jahn R, Sambandan S. Colocalization of different neurotransmitter transporters on synaptic vesicles is sparse except for VGLUT1 and ZnT3. Neuron 2022; 110:1483-1497.e7. [PMID: 35263617 DOI: 10.1016/j.neuron.2022.02.008] [Citation(s) in RCA: 21] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2021] [Revised: 01/08/2022] [Accepted: 02/10/2022] [Indexed: 12/26/2022]
Abstract
Vesicular transporters (VTs) define the type of neurotransmitter that synaptic vesicles (SVs) store and release. While certain mammalian neurons release multiple transmitters, it is not clear whether the release occurs from the same or distinct vesicle pools at the synapse. Using quantitative single-vesicle imaging, we show that a vast majority of SVs in the rodent brain contain only one type of VT, indicating specificity for a single neurotransmitter. Interestingly, SVs containing dual transporters are highly diverse (27 types) but small in proportion (2% of all SVs), excluding the largest pool that carries VGLUT1 and ZnT3 (34%). Using VGLUT1-ZnT3 SVs, we demonstrate that the transporter colocalization influences the SV content and synaptic quantal size. Thus, the presence of diverse transporters on the same vesicle is bona fide, and depending on the VT types, this may act to regulate neurotransmitter type, content, and release in space and time.
Collapse
Affiliation(s)
- Neha Upmanyu
- Synaptic Metal Ion Dynamics and Signaling, Max Planck Institute for Multidisciplinary Sciences, Göttingen 37077, Germany; Laboratory of Neurobiology, Max Planck Institute for Multidisciplinary Sciences, Göttingen 37077, Germany
| | - Jialin Jin
- European Neurosciences Institute, A Joint Initiative of the University Medical Center Göttingen and the Max Planck Society, Göttingen 37077, Germany
| | - Henrik von der Emde
- Department of NanoBiophotonics, Max Planck Institute for Multidisciplinary Sciences, Göttingen 37077, Germany
| | - Marcelo Ganzella
- Laboratory of Neurobiology, Max Planck Institute for Multidisciplinary Sciences, Göttingen 37077, Germany
| | - Leon Bösche
- Synaptic Metal Ion Dynamics and Signaling, Max Planck Institute for Multidisciplinary Sciences, Göttingen 37077, Germany; Laboratory of Neurobiology, Max Planck Institute for Multidisciplinary Sciences, Göttingen 37077, Germany
| | - Viveka Nand Malviya
- Laboratory of Neurobiology, Max Planck Institute for Multidisciplinary Sciences, Göttingen 37077, Germany
| | - Evi Zhuleku
- Laboratory of Neurobiology, Max Planck Institute for Multidisciplinary Sciences, Göttingen 37077, Germany
| | - Antonio Zaccaria Politi
- Live-Cell Imaging Facility, Max Planck Institute for Multidisciplinary Sciences, Göttingen 37077, Germany
| | - Momchil Ninov
- Bioanalytical Mass Spectrometry, Max Planck Institute for Multidisciplinary Sciences, Göttingen 37077, Germany; Institute of Clinical Chemistry, University Medical Center Göttingen, Göttingen 37075, Germany
| | - Ivan Silbern
- Bioanalytical Mass Spectrometry, Max Planck Institute for Multidisciplinary Sciences, Göttingen 37077, Germany; Institute of Clinical Chemistry, University Medical Center Göttingen, Göttingen 37075, Germany
| | - Marcel Leutenegger
- Department of NanoBiophotonics, Max Planck Institute for Multidisciplinary Sciences, Göttingen 37077, Germany
| | - Henning Urlaub
- Bioanalytical Mass Spectrometry, Max Planck Institute for Multidisciplinary Sciences, Göttingen 37077, Germany; Institute of Clinical Chemistry, University Medical Center Göttingen, Göttingen 37075, Germany
| | - Dietmar Riedel
- Department of Structural Dynamics, Max Planck Institute for Multidisciplinary Sciences, Göttingen 37077, Germany
| | - Julia Preobraschenski
- Laboratory of Neurobiology, Max Planck Institute for Multidisciplinary Sciences, Göttingen 37077, Germany; Institute for Auditory Neuroscience, University Medical Center Göttingen, Göttingen 37075, Germany; Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen, Göttingen 37075, Germany
| | - Ira Milosevic
- Wellcome Centre for Human Genetics, Nuffield Department of Medicine, NIHR Oxford Biomedical Research Centre, University of Oxford, Oxford OX3 7BN, UK; Multidisciplinary Institute of Ageing, MIA-Portugal, University of Coimbra, Coimbra 3000-370, Portugal
| | - Stefan W Hell
- Department of NanoBiophotonics, Max Planck Institute for Multidisciplinary Sciences, Göttingen 37077, Germany; Department of Optical Nanoscopy, Max Planck Institute for Medical Research, Heidelberg 69028, Germany
| | - Reinhard Jahn
- Laboratory of Neurobiology, Max Planck Institute for Multidisciplinary Sciences, Göttingen 37077, Germany
| | - Sivakumar Sambandan
- Synaptic Metal Ion Dynamics and Signaling, Max Planck Institute for Multidisciplinary Sciences, Göttingen 37077, Germany; Laboratory of Neurobiology, Max Planck Institute for Multidisciplinary Sciences, Göttingen 37077, Germany; Department of NanoBiophotonics, Max Planck Institute for Multidisciplinary Sciences, Göttingen 37077, Germany.
| |
Collapse
|
14
|
Abstract
Synaptic vesicles (SVs) store neurotransmitters and undergo a fine-tuned regulatory and dynamic cycle of exo- and endocytosis, which is essential for neurotransmission at chemical synapses. The development of protocols for isolating SVs from biological extracts was a fundamental accomplishment since it allowed for characterizing the molecular properties of SVs using biochemical methods. In this chapter, we describe a modified procedure for isolating SVs from a few g of rodent brain and that can be completed within ~12 h. The protocol involves the preparation of isolated nerve terminals from which SVs are released by osmotic shock and then enriched via various centrifugation steps, followed by size exclusion chromatography as final purification step. The final vesicle fraction is 22-fold enriched in SVs over the starting material, and the final yield of SVs obtained using this protocol is approximately 20 μg of protein per gram of mouse brain. The degree of contamination by other organelles and particles monitored by morphology and immunolabeling compares well with that of the classical protocols.
Collapse
Affiliation(s)
- Marcelo Ganzella
- Laboratory of Neurobiology, Max-Planck-Institute for Biophysical Chemistry, Göttingen, Germany.
| | - Momchil Ninov
- Laboratory of Neurobiology, Max-Planck-Institute for Biophysical Chemistry, Göttingen, Germany
- Bioanalytical Mass Spectrometry, Max-Planck-Institute for Biophysical Chemistry, Göttingen, Germany
| | - Dietmar Riedel
- Facility for Transmission Electron Microscopy, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Reinhard Jahn
- Laboratory of Neurobiology, Max-Planck-Institute for Biophysical Chemistry, Göttingen, Germany
- Georg-August University, Göttingen, Germany
| |
Collapse
|
15
|
Bissinger T, Wu Y, Marichal-Gallardo P, Riedel D, Liu X, Genzel Y, Tan WS, Reichl U. Towards integrated production of an influenza A vaccine candidate with MDCK suspension cells. Biotechnol Bioeng 2021; 118:3996-4013. [PMID: 34219217 DOI: 10.1002/bit.27876] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2021] [Revised: 06/01/2021] [Accepted: 06/23/2021] [Indexed: 12/11/2022]
Abstract
Seasonal influenza epidemics occur both in northern and southern hemispheres every year. Despite the differences in influenza virus surface antigens and virulence of seasonal subtypes, manufacturers are well-adapted to respond to this periodical vaccine demand. Due to decades of influenza virus research, the development of new influenza vaccines is relatively straight forward. In similarity with the ongoing coronavirus disease 2019 pandemic, vaccine manufacturing is a major bottleneck for a rapid supply of the billions of doses required worldwide. In particular, egg-based vaccine production would be difficult to schedule and shortages of other egg-based vaccines with high demands also have to be anticipated. Cell culture-based production systems enable the manufacturing of large amounts of vaccines within a short time frame and expand significantly our options to respond to pandemics and emerging viral diseases. In this study, we present an integrated process for the production of inactivated influenza A virus vaccines based on a Madin-Darby Canine Kidney (MDCK) suspension cell line cultivated in a chemically defined medium. Very high titers of 3.6 log10 (HAU/100 µl) were achieved using fast-growing MDCK cells at concentrations up to 9.5 × 106 cells/ml infected with influenza A/PR/8/34 H1N1 virus in 1 L stirred tank bioreactors. A combination of membrane-based steric-exclusion chromatography followed by pseudo-affinity chromatography with a sulfated cellulose membrane adsorber enabled full recovery for the virus capture step and up to 80% recovery for the virus polishing step. Purified virus particles showed a homogenous size distribution with a mean diameter of 80 nm. Based on a monovalent dose of 15 µg hemagglutinin (single-radial immunodiffusion assay), the level of total protein and host cell DNA was 58 µg and 10 ng, respectively. Furthermore, all process steps can be fully scaled up to industrial quantities for commercial manufacturing of either seasonal or pandemic influenza virus vaccines. Fast production of up to 300 vaccine doses per liter within 4-5 days makes this process competitive not only to other cell-based processes but to egg-based processes as well.
Collapse
Affiliation(s)
- Thomas Bissinger
- Bioprocess Engineering, Max Planck Institute for Dynamics of Complex Technical Systems, Magdeburg, Germany
| | - Yixiao Wu
- Bioprocess Engineering, Max Planck Institute for Dynamics of Complex Technical Systems, Magdeburg, Germany.,State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, China
| | - Pavel Marichal-Gallardo
- Bioprocess Engineering, Max Planck Institute for Dynamics of Complex Technical Systems, Magdeburg, Germany
| | - Dietmar Riedel
- Facility for Transmission Electron Microscopy, Max Planck Institute for Biophysical Chemistry, Goettingen, Germany
| | - Xuping Liu
- Shanghai BioEngine Sci-Tech Co., Shanghai, China
| | - Yvonne Genzel
- Bioprocess Engineering, Max Planck Institute for Dynamics of Complex Technical Systems, Magdeburg, Germany
| | - Wen-Song Tan
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, China.,Shanghai BioEngine Sci-Tech Co., Shanghai, China
| | - Udo Reichl
- Bioprocess Engineering, Max Planck Institute for Dynamics of Complex Technical Systems, Magdeburg, Germany.,Chair of Bioprocess Engineering, Otto von Guericke University Magdeburg, Magdeburg, Germany
| |
Collapse
|
16
|
Lange F, Agüi-Gonzalez P, Riedel D, Phan NTN, Jakobs S, Rizzoli SO. Correlative fluorescence microscopy, transmission electron microscopy and secondary ion mass spectrometry (CLEM-SIMS) for cellular imaging. PLoS One 2021; 16:e0240768. [PMID: 33970908 PMCID: PMC8109779 DOI: 10.1371/journal.pone.0240768] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2020] [Accepted: 04/13/2021] [Indexed: 11/24/2022] Open
Abstract
Electron microscopy (EM) has been employed for decades to analyze cell structure. To also analyze the positions and functions of specific proteins, one typically relies on immuno-EM or on a correlation with fluorescence microscopy, in the form of correlated light and electron microscopy (CLEM). Nevertheless, neither of these procedures is able to also address the isotopic composition of cells. To solve this, a correlation with secondary ion mass spectrometry (SIMS) would be necessary. SIMS has been correlated in the past to EM or to fluorescence microscopy in biological samples, but not to CLEM. We achieved this here, using a protocol based on transmission EM, conventional epifluorescence microscopy and nanoSIMS. The protocol is easily applied, and enables the use of all three technologies at high performance parameters. We suggest that CLEM-SIMS will provide substantial information that is currently beyond the scope of conventional correlative approaches.
Collapse
Affiliation(s)
- Felix Lange
- Research Group Mitochondrial Structure and Dynamics, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
- Clinic for Neurology, University Medical Center Göttingen, Göttingen, Germany
| | - Paola Agüi-Gonzalez
- Department of Neuro- and Sensory Physiology, University Medical Center Göttingen, Göttingen, Germany
- Center for Biostructural Imaging of Neurodegeneration, University Medical Center Göttingen, Göttingen, Germany
| | - Dietmar Riedel
- Laboratory of Electron Microscopy, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Nhu T. N. Phan
- Department of Neuro- and Sensory Physiology, University Medical Center Göttingen, Göttingen, Germany
- Center for Biostructural Imaging of Neurodegeneration, University Medical Center Göttingen, Göttingen, Germany
| | - Stefan Jakobs
- Research Group Mitochondrial Structure and Dynamics, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
- Clinic for Neurology, University Medical Center Göttingen, Göttingen, Germany
- Center for Biostructural Imaging of Neurodegeneration, University Medical Center Göttingen, Göttingen, Germany
- * E-mail: (SJ); (SOR)
| | - Silvio O. Rizzoli
- Department of Neuro- and Sensory Physiology, University Medical Center Göttingen, Göttingen, Germany
- Center for Biostructural Imaging of Neurodegeneration, University Medical Center Göttingen, Göttingen, Germany
- * E-mail: (SJ); (SOR)
| |
Collapse
|
17
|
Antonschmidt L, Dervişoğlu R, Sant V, Tekwani Movellan K, Mey I, Riedel D, Steinem C, Becker S, Andreas LB, Griesinger C. Insights into the molecular mechanism of amyloid filament formation: Segmental folding of α-synuclein on lipid membranes. Sci Adv 2021; 7:7/20/eabg2174. [PMID: 33990334 PMCID: PMC8121418 DOI: 10.1126/sciadv.abg2174] [Citation(s) in RCA: 35] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2020] [Accepted: 03/25/2021] [Indexed: 05/15/2023]
Abstract
Recent advances in the structural biology of disease-relevant α-synuclein fibrils have revealed a variety of structures, yet little is known about the process of fibril aggregate formation. Characterization of intermediate species that form during aggregation is crucial; however, this has proven very challenging because of their transient nature, heterogeneity, and low population. Here, we investigate the aggregation of α-synuclein bound to negatively charged phospholipid small unilamellar vesicles. Through a combination of kinetic and structural studies, we identify key time points in the aggregation process that enable targeted isolation of prefibrillar and early fibrillar intermediates. By using solid-state nuclear magnetic resonance, we show the gradual buildup of structural features in an α-synuclein fibril filament, revealing a segmental folding process. We identify distinct membrane-binding domains in α-synuclein aggregates, and the combined data are used to present a comprehensive mechanism of the folding of α-synuclein on lipid membranes.
Collapse
Affiliation(s)
- Leif Antonschmidt
- Department of NMR-Based Structural Biology, Max-Planck-Institute for Biophysical Chemistry, Göttingen, Germany
| | - Rıza Dervişoğlu
- Department of NMR-Based Structural Biology, Max-Planck-Institute for Biophysical Chemistry, Göttingen, Germany
| | - Vrinda Sant
- Department of NMR-Based Structural Biology, Max-Planck-Institute for Biophysical Chemistry, Göttingen, Germany
- Department of Mechanical and Aerospace Engineering, University of California San Diego, San Diego, CA, USA
| | - Kumar Tekwani Movellan
- Department of NMR-Based Structural Biology, Max-Planck-Institute for Biophysical Chemistry, Göttingen, Germany
| | - Ingo Mey
- Institute of Organic and Biomolecular Chemistry, Georg-August-Universität Göttingen, Göttingen, Germany
| | - Dietmar Riedel
- Laboratory of Electron Microscopy, Max-Planck-Institute for Biophysical Chemistry, Göttingen, Germany
| | - Claudia Steinem
- Institute of Organic and Biomolecular Chemistry, Georg-August-Universität Göttingen, Göttingen, Germany
- Biomolecular Chemistry Group, Max-Planck Institute for Dynamics and Self-Organization, Am Fassberg 17, 37077 Göttingen, Germany
- Cluster of Excellence "Multiscale Bioimaging: From Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen, Göttingen, Germany
| | - Stefan Becker
- Department of NMR-Based Structural Biology, Max-Planck-Institute for Biophysical Chemistry, Göttingen, Germany
| | - Loren B Andreas
- Department of NMR-Based Structural Biology, Max-Planck-Institute for Biophysical Chemistry, Göttingen, Germany.
| | - Christian Griesinger
- Department of NMR-Based Structural Biology, Max-Planck-Institute for Biophysical Chemistry, Göttingen, Germany.
- Cluster of Excellence "Multiscale Bioimaging: From Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen, Göttingen, Germany
| |
Collapse
|
18
|
Friker LL, Scheiblich H, Hochheiser IV, Brinkschulte R, Riedel D, Latz E, Geyer M, Heneka MT. β-Amyloid Clustering around ASC Fibrils Boosts Its Toxicity in Microglia. Cell Rep 2021; 30:3743-3754.e6. [PMID: 32187546 PMCID: PMC8729885 DOI: 10.1016/j.celrep.2020.02.025] [Citation(s) in RCA: 98] [Impact Index Per Article: 32.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2019] [Revised: 12/20/2019] [Accepted: 02/06/2020] [Indexed: 02/08/2023] Open
Abstract
Alzheimer’s disease is the world’s most common neurodegenerative disorder. It is associated with neuroinflammation involving activation of microglia by β-amyloid (Aβ) deposits. Based on previous studies showing apoptosis-associated speck-like protein containing a CARD (ASC) binding and cross-seeding extracellular Aβ, we investigate the propagation of ASC between primary microglia and the effects of ASC-Aβ composites on microglial inflammasomes and function. Indeed, ASC released by a pyroptotic cell can be functionally built into the neighboring microglia NOD-like receptor protein (NLRP3) inflammasome. Compared with protein-only application, exposure to ASC-Aβ composites amplifies the proinflammatory response, resulting in pyroptotic cell death, setting free functional ASC and inducing a feedforward stimulating vicious cycle. Clustering around ASC fibrils also compromises clearance of Aβ by microglia. Together, these data enable a closer look at the turning point from acute to chronic Aβ-related neuroinflammation through formation of ASC-Aβ composites. Friker et al. investigate the reaction of primary microglia to exogenous ASC and ASC-Aβ composites. They uncover a vicious circle involving amplified NLRP3 inflammasome activity and reduced Aβ clearance in the presence of ASC that might play a key role in Alzheimer’s disease progression.
Collapse
Affiliation(s)
- Lea L Friker
- Department of Neurodegenerative Disease and Gerontopsychiatry/Neurology, University of Bonn Medical Center, 53127 Bonn, Germany
| | - Hannah Scheiblich
- Department of Neurodegenerative Disease and Gerontopsychiatry/Neurology, University of Bonn Medical Center, 53127 Bonn, Germany
| | - Inga V Hochheiser
- Institute of Structural Biology, University of Bonn, 53127 Bonn, Germany
| | | | - Dietmar Riedel
- Max Planck Institute for Biophysical Chemistry, Department of Structural Dynamics, 37077 Göttingen, Germany
| | - Eicke Latz
- Institute of Innate Immunity, University of Bonn, 53127 Bonn, Germany
| | - Matthias Geyer
- Institute of Structural Biology, University of Bonn, 53127 Bonn, Germany
| | - Michael T Heneka
- Department of Neurodegenerative Disease and Gerontopsychiatry/Neurology, University of Bonn Medical Center, 53127 Bonn, Germany; German Center for Neurodegenerative Diseases (DZNE), 53127 Bonn, Germany; Department of Infectious Diseases and Immunology, University of Massachusetts Medical School, Worcester, MA 01655, USA.
| |
Collapse
|
19
|
Wittig S, Ganzella M, Barth M, Kostmann S, Riedel D, Pérez-Lara Á, Jahn R, Schmidt C. Cross-linking mass spectrometry uncovers protein interactions and functional assemblies in synaptic vesicle membranes. Nat Commun 2021; 12:858. [PMID: 33558502 PMCID: PMC7870876 DOI: 10.1038/s41467-021-21102-w] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2020] [Accepted: 12/18/2020] [Indexed: 02/08/2023] Open
Abstract
Synaptic vesicles are storage organelles for neurotransmitters. They pass through a trafficking cycle and fuse with the pre-synaptic membrane when an action potential arrives at the nerve terminal. While molecular components and biophysical parameters of synaptic vesicles have been determined, our knowledge on the protein interactions in their membranes is limited. Here, we apply cross-linking mass spectrometry to study interactions of synaptic vesicle proteins in an unbiased approach without the need for specific antibodies or detergent-solubilisation. Our large-scale analysis delivers a protein network of vesicle sub-populations and functional assemblies including an active and an inactive conformation of the vesicular ATPase complex as well as non-conventional arrangements of the luminal loops of SV2A, Synaptophysin and structurally related proteins. Based on this network, we specifically target Synaptobrevin-2, which connects with many proteins, in different approaches. Our results allow distinction of interactions caused by 'crowding' in the vesicle membrane from stable interaction modules.
Collapse
Affiliation(s)
- Sabine Wittig
- Interdisciplinary Research Centre HALOmem, Charles Tanford Protein Centre, Institute for Biochemistry and Biotechnology, Martin Luther University Halle-Wittenberg, Halle, Germany
| | - Marcelo Ganzella
- Department for Neurobiology, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Marie Barth
- Interdisciplinary Research Centre HALOmem, Charles Tanford Protein Centre, Institute for Biochemistry and Biotechnology, Martin Luther University Halle-Wittenberg, Halle, Germany
| | - Susann Kostmann
- Interdisciplinary Research Centre HALOmem, Charles Tanford Protein Centre, Institute for Biochemistry and Biotechnology, Martin Luther University Halle-Wittenberg, Halle, Germany
| | - Dietmar Riedel
- Department for Neurobiology, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Ángel Pérez-Lara
- Department for Neurobiology, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
- Department of Physical Chemistry, Faculty of Pharmacy, University of Granada, Granada, Spain
| | - Reinhard Jahn
- Department for Neurobiology, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Carla Schmidt
- Interdisciplinary Research Centre HALOmem, Charles Tanford Protein Centre, Institute for Biochemistry and Biotechnology, Martin Luther University Halle-Wittenberg, Halle, Germany.
| |
Collapse
|
20
|
Abstract
Tight barriers are crucial for animals. Insect respiratory cells establish barriers through their extracellular matrices. These chitinous-matrices must be soft and flexible to provide ventilation, but also tight enough to allow oxygen flow and protection against dehydration, infections, and environmental stresses. However, genes that control soft, flexible chitin-matrices are poorly known. We investigated the genes of the chitinolytic glycosylhydrolase-family 18 in the tracheal system of Drosophila melanogaster. Our findings show that five chitinases and three chitinase-like genes organize the tracheal chitin-cuticles. Most of the chitinases degrade chitin from airway lumina to enable oxygen delivery. They further improve chitin-cuticles to enhance tube stability and integrity against stresses. Unexpectedly, some chitinases also support chitin assembly to expand the tube lumen properly. Moreover, Chitinase2 plays a decisive role in the chitin-cuticle formation that establishes taenidial folds to support tube stability. Chitinase2 is apically enriched on the surface of tracheal cells, where it controls the chitin-matrix architecture independently of other known cuticular proteins or chitinases. We suppose that the principle mechanisms of chitin-cuticle assembly and degradation require a set of critical glycosylhydrolases for flexible and not-flexible cuticles. The same glycosylhydrolases support thick laminar cuticle formation and are evolutionarily conserved among arthropods.
Collapse
Affiliation(s)
- Matthias Behr
- Institute for Biology, Leipzig University, Philipp-Rosenthal-Str. 55, 04103, Leipzig, Germany.
| | - Dietmar Riedel
- Max-Planck-Institute for Biophysical Chemistry, Electron Microscopy Group, 37077, Göttingen, Germany
| |
Collapse
|
21
|
Stephan T, Brüser C, Deckers M, Steyer AM, Balzarotti F, Barbot M, Behr TS, Heim G, Hübner W, Ilgen P, Lange F, Pacheu-Grau D, Pape JK, Stoldt S, Huser T, Hell SW, Möbius W, Rehling P, Riedel D, Jakobs S. MICOS assembly controls mitochondrial inner membrane remodeling and crista junction redistribution to mediate cristae formation. EMBO J 2020; 39:e104105. [PMID: 32567732 PMCID: PMC7361284 DOI: 10.15252/embj.2019104105] [Citation(s) in RCA: 94] [Impact Index Per Article: 23.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2019] [Revised: 05/08/2020] [Accepted: 05/13/2020] [Indexed: 12/26/2022] Open
Abstract
Mitochondrial function is critically dependent on the folding of the mitochondrial inner membrane into cristae; indeed, numerous human diseases are associated with aberrant crista morphologies. With the MICOS complex, OPA1 and the F1 Fo -ATP synthase, key players of cristae biogenesis have been identified, yet their interplay is poorly understood. Harnessing super-resolution light and 3D electron microscopy, we dissect the roles of these proteins in the formation of cristae in human mitochondria. We individually disrupted the genes of all seven MICOS subunits in human cells and re-expressed Mic10 or Mic60 in the respective knockout cell line. We demonstrate that assembly of the MICOS complex triggers remodeling of pre-existing unstructured cristae and de novo formation of crista junctions (CJs) on existing cristae. We show that the Mic60-subcomplex is sufficient for CJ formation, whereas the Mic10-subcomplex controls lamellar cristae biogenesis. OPA1 stabilizes tubular CJs and, along with the F1 Fo -ATP synthase, fine-tunes the positioning of the MICOS complex and CJs. We propose a new model of cristae formation, involving the coordinated remodeling of an unstructured crista precursor into multiple lamellar cristae.
Collapse
Affiliation(s)
- Till Stephan
- Department of NanoBiophotonics, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany.,Clinic of Neurology, University Medical Center Göttingen, Göttingen, Germany
| | - Christian Brüser
- Department of NanoBiophotonics, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany.,Clinic of Neurology, University Medical Center Göttingen, Göttingen, Germany
| | - Markus Deckers
- Department of Cellular Biochemistry, University Medical Center Göttingen, Göttingen, Germany
| | - Anna M Steyer
- Department of Neurogenetics, Electron Microscopy Core Unit, Max Planck Institute of Experimental Medicine, Göttingen, Germany
| | - Francisco Balzarotti
- Department of NanoBiophotonics, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Mariam Barbot
- Department of NanoBiophotonics, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany.,Clinic of Neurology, University Medical Center Göttingen, Göttingen, Germany
| | - Tiana S Behr
- Department of NanoBiophotonics, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany.,Clinic of Neurology, University Medical Center Göttingen, Göttingen, Germany
| | - Gudrun Heim
- Laboratory of Electron Microscopy, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Wolfgang Hübner
- Department of Physics, University Bielefeld, Bielefeld, Germany
| | - Peter Ilgen
- Department of NanoBiophotonics, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany.,Clinic of Neurology, University Medical Center Göttingen, Göttingen, Germany
| | - Felix Lange
- Department of NanoBiophotonics, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany.,Clinic of Neurology, University Medical Center Göttingen, Göttingen, Germany
| | - David Pacheu-Grau
- Department of Cellular Biochemistry, University Medical Center Göttingen, Göttingen, Germany
| | - Jasmin K Pape
- Department of NanoBiophotonics, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Stefan Stoldt
- Department of NanoBiophotonics, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany.,Clinic of Neurology, University Medical Center Göttingen, Göttingen, Germany
| | - Thomas Huser
- Department of Physics, University Bielefeld, Bielefeld, Germany
| | - Stefan W Hell
- Department of NanoBiophotonics, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany.,Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells" (MBExC), University of Goettingen, Goettingen, Germany
| | - Wiebke Möbius
- Department of Neurogenetics, Electron Microscopy Core Unit, Max Planck Institute of Experimental Medicine, Göttingen, Germany
| | - Peter Rehling
- Department of Cellular Biochemistry, University Medical Center Göttingen, Göttingen, Germany.,Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells" (MBExC), University of Goettingen, Goettingen, Germany
| | - Dietmar Riedel
- Laboratory of Electron Microscopy, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Stefan Jakobs
- Department of NanoBiophotonics, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany.,Clinic of Neurology, University Medical Center Göttingen, Göttingen, Germany.,Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells" (MBExC), University of Goettingen, Goettingen, Germany
| |
Collapse
|
22
|
Königsmann T, Parfentev I, Urlaub H, Riedel D, Schuh R. The bicistronic gene würmchen encodes two essential components for epithelial development in Drosophila. Dev Biol 2020; 463:53-62. [PMID: 32361005 DOI: 10.1016/j.ydbio.2020.04.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2019] [Revised: 03/17/2020] [Accepted: 04/07/2020] [Indexed: 11/24/2022]
Abstract
Epithelial tissues are fundamental for the establishment and maintenance of different body compartments in multicellular animals. To achieve this specific task epithelial sheets secrete an apical extracellular matrix for tissue strength and protection and they organize a transepithelial barrier function, which is mediated by tight junctions in vertebrates or septate junctions in invertebrates. Here, we show that the bicistronic gene würmchen is functionally expressed in epithelial tissues. CRISPR/Cas9-mediated mutations in both coding sequences reveal two essential polypeptides, Würmchen1 and Würmchen2, which are both necessary for normal epithelial tissue development. Würmchen1 represents a genuine septate junction core component. It is required during embryogenesis for septate junction organization, the establishment of a transepithelial barrier function, distinct cellular transport processes and tracheal system morphogenesis. Würmchen2 is localized in the apical membrane region of epithelial tissues and in a central core of the tracheal lumen during embryogenesis. It is essential during the later larval development.
Collapse
Affiliation(s)
- Tatiana Königsmann
- Research Group Molecular Organogenesis, Max-Planck-Institute for Biophysical Chemistry, Am Fassberg, D-37077, Göttingen, Germany
| | - Iwan Parfentev
- Research Group Bioanalytical Mass Spectrometry, Max-Planck-Institute for Biophysical Chemistry, Am Fassberg, D-37077, Göttingen, Germany
| | - Henning Urlaub
- Research Group Bioanalytical Mass Spectrometry, Max-Planck-Institute for Biophysical Chemistry, Am Fassberg, D-37077, Göttingen, Germany; Bioanalytics, Institute for Clinical Chemistry, University Medical Center, Robert-Koch-Strasse 420, 37075 Göttingen, Germany
| | - Dietmar Riedel
- Electron Microscopy Group, Max-Planck-Institute for Biophysical Chemistry, Am Fassberg, D-37077, Göttingen, Germany
| | - Reinhard Schuh
- Research Group Molecular Organogenesis, Max-Planck-Institute for Biophysical Chemistry, Am Fassberg, D-37077, Göttingen, Germany.
| |
Collapse
|
23
|
Hehlert P, Hofferek V, Heier C, Eichmann TO, Riedel D, Rosenberg J, Takaćs A, Nagy HM, Oberer M, Zimmermann R, Kühnlein RP. The α/β-hydrolase domain-containing 4- and 5-related phospholipase Pummelig controls energy storage in Drosophila. J Lipid Res 2019; 60:1365-1378. [PMID: 31164391 DOI: 10.1194/jlr.m092817] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2019] [Revised: 06/03/2019] [Indexed: 01/05/2023] Open
Abstract
Triglycerides (TGs) are the main energy storage form that accommodates changing organismal energy demands. In Drosophila melanogaster, the TG lipase Brummer is centrally important for body fat mobilization. Its gene brummer (bmm) encodes the ortholog of mammalian adipose TG lipase, which becomes activated by α/β-hydrolase domain-containing 5 (ABHD5/CGI-58), one member of the paralogous gene pair, α/β-hydrolase domain-containing 4 (ABHD4) and ABHD5 In Drosophila, the pummelig (puml) gene encodes the single sequence-related protein to mammalian ABHD4/ABHD5 with unknown function. We generated puml deletion mutant flies, that were short-lived as a result of lipid metabolism changes, stored excess body fat at the expense of glycogen, and exhibited ectopic fat storage with altered TG FA profile in the fly kidneys, called Malpighian tubules. TG accumulation in puml mutants was not associated with increased food intake but with elevated lipogenesis; starvation-induced lipid mobilization remained functional. Despite its structural similarity to mammalian ABHD5, Puml did not stimulate TG lipase activity of Bmm in vitro. Rather, Puml acted as a phospholipase that localized on lipid droplets, mitochondria, and peroxisomes. Together, these results show that the ABHD4/5 family member Puml is a versatile phospholipase that regulates Drosophila body fat storage and energy metabolism.
Collapse
Affiliation(s)
- Philip Hehlert
- Research Group Molecular Physiology Max-Planck-Institut für Biophysikalische Chemie, Göttingen, Germany
| | - Vinzenz Hofferek
- Max-Planck-Institut für Molekulare Pflanzenphysiologie Potsdam, Germany
| | - Christoph Heier
- Institute of Molecular Biosciences University of Graz, Graz, Austria
| | - Thomas O Eichmann
- Institute of Molecular Biosciences University of Graz, Graz, Austria
| | - Dietmar Riedel
- Department of Structural Dynamics, Electron Microscopy, Max-Planck-Institut für Biophysikalische Chemie, Göttingen, Germany
| | - Jonathan Rosenberg
- Research Group Molecular Physiology Max-Planck-Institut für Biophysikalische Chemie, Göttingen, Germany
| | - Anna Takaćs
- Research Group Molecular Physiology Max-Planck-Institut für Biophysikalische Chemie, Göttingen, Germany
| | - Harald M Nagy
- Institute of Molecular Biosciences University of Graz, Graz, Austria
| | - Monika Oberer
- Institute of Molecular Biosciences University of Graz, Graz, Austria.,BioTechMed-Graz Graz, Austria
| | - Robert Zimmermann
- Institute of Molecular Biosciences University of Graz, Graz, Austria.,BioTechMed-Graz Graz, Austria
| | - Ronald P Kühnlein
- Research Group Molecular Physiology Max-Planck-Institut für Biophysikalische Chemie, Göttingen, Germany .,Institute of Molecular Biosciences University of Graz, Graz, Austria.,BioTechMed-Graz Graz, Austria
| |
Collapse
|
24
|
Wildung M, Esser TU, Grausam KB, Wiedwald C, Volceanov-Hahn L, Riedel D, Beuermann S, Li L, Zylla J, Guenther AK, Wienken M, Ercetin E, Han Z, Bremmer F, Shomroni O, Andreas S, Zhao H, Lizé M. Transcription factor TAp73 and microRNA-449 complement each other to support multiciliogenesis. Cell Death Differ 2019; 26:2740-2757. [PMID: 31068677 DOI: 10.1038/s41418-019-0332-7] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2018] [Revised: 02/24/2019] [Accepted: 03/13/2019] [Indexed: 01/08/2023] Open
Abstract
Motile cilia serve vital functions in development, homeostasis, and regeneration. We recently demonstrated that TAp73 is an essential transcriptional regulator of respiratory multiciliogenesis. Here, we show that TAp73 is expressed in multiciliated cells (MCCs) of diverse tissues. Analysis of TAp73 mutant animals revealed that TAp73 regulates Foxj1, Rfx2, Rfx3, axonemal dyneins Dnali1 and Dnai1, plays a pivotal role in the generation of MCCs in male and female reproductive ducts, and contributes to fertility. However, the function of MCCs in the brain appears to be preserved despite the loss of TAp73, and robust activity of cilia-related networks is maintained in the absence of TAp73. Notably, TAp73 loss leads to distinct changes in ciliogenic microRNAs: miR34bc expression is reduced, whereas the miR449 cluster is induced in diverse multiciliated epithelia. Among different MCCs, choroid plexus (CP) epithelial cells in the brain display prominent miR449 expression, whereas brain ventricles exhibit significant increase in miR449 levels along with an increase in the activity of ciliogenic E2F4/MCIDAS circuit in TAp73 mutant animals. Conversely, E2F4 induces robust transcriptional response from miR449 genomic regions. To address whether increased miR449 levels in the brain maintain the multiciliogenesis program in the absence of TAp73, we deleted both TAp73 and miR449 in mice. Although loss of miR449 alone led to a mild ciliary defect in the CP, more pronounced ciliary defects and hydrocephalus were observed in the brain lacking both TAp73 and miR449. In contrast, miR449 loss in other MCCs failed to enhance ciliary defects associated with TAp73 loss. Together, our study shows that, in addition to the airways, TAp73 is essential for generation of MCCs in male and female reproductive ducts, whereas miR449 and TAp73 complement each other to support multiciliogenesis and CP development in the brain.
Collapse
Affiliation(s)
- Merit Wildung
- Molecular & Experimental Pneumology Group, Clinic for Cardiology and Pneumology, University Medical Center Goettingen, Goettingen, Germany
| | - Tilman Uli Esser
- Molecular & Experimental Pneumology Group, Clinic for Cardiology and Pneumology, University Medical Center Goettingen, Goettingen, Germany
| | - Katie Baker Grausam
- Cancer Biology and Immunotherapeutics Group, Sanford Research, Sioux Falls, SD, USA.,Division of Basic Biomedical Sciences, University of South Dakota, Sanford School of Medicine, Vermillion, SD, USA
| | - Cornelia Wiedwald
- Molecular & Experimental Pneumology Group, Clinic for Cardiology and Pneumology, University Medical Center Goettingen, Goettingen, Germany
| | - Larisa Volceanov-Hahn
- Molecular & Experimental Pneumology Group, Clinic for Cardiology and Pneumology, University Medical Center Goettingen, Goettingen, Germany
| | - Dietmar Riedel
- Electron Microscopy, Max-Planck-Institute for Biophysical Chemistry, Goettingen, Germany
| | - Sabine Beuermann
- Molecular & Experimental Pneumology Group, Clinic for Cardiology and Pneumology, University Medical Center Goettingen, Goettingen, Germany
| | - Li Li
- Cancer Biology and Immunotherapeutics Group, Sanford Research, Sioux Falls, SD, USA
| | - Jessica Zylla
- Cancer Biology and Immunotherapeutics Group, Sanford Research, Sioux Falls, SD, USA
| | - Ann-Kathrin Guenther
- Department of Genes and Behavior, MPI for Biophysical Chemistry, Goettingen, Germany
| | - Magdalena Wienken
- Institute of Molecular Oncology, University Medical Center Goettingen, Goettingen, Germany
| | - Evrim Ercetin
- Molecular & Experimental Pneumology Group, Clinic for Cardiology and Pneumology, University Medical Center Goettingen, Goettingen, Germany
| | - Zhiyuan Han
- Department of Biomedical Sciences, New York Institute of Technology College of Osteopathic Medicine, Old Westbury, NY, USA
| | - Felix Bremmer
- Institute of Pathology, University Medical Center Goettingen, Goettingen, Germany
| | - Orr Shomroni
- Microarray and Deep-Sequencing Core Facility, University Medical Center Goettingen, Goettingen, Germany
| | - Stefan Andreas
- Molecular & Experimental Pneumology Group, Clinic for Cardiology and Pneumology, University Medical Center Goettingen, Goettingen, Germany
| | - Haotian Zhao
- Cancer Biology and Immunotherapeutics Group, Sanford Research, Sioux Falls, SD, USA. .,Division of Basic Biomedical Sciences, University of South Dakota, Sanford School of Medicine, Vermillion, SD, USA. .,Department of Biomedical Sciences, New York Institute of Technology College of Osteopathic Medicine, Old Westbury, NY, USA.
| | - Muriel Lizé
- Molecular & Experimental Pneumology Group, Clinic for Cardiology and Pneumology, University Medical Center Goettingen, Goettingen, Germany.
| |
Collapse
|
25
|
Valiente-Gabioud AA, Riedel D, Outeiro TF, Menacho-Márquez MA, Griesinger C, Fernández CO. Binding Modes of Phthalocyanines to Amyloid β Peptide and Their Effects on Amyloid Fibril Formation. Biophys J 2019. [PMID: 29539391 DOI: 10.1016/j.bpj.2018.01.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
The inherent tendency of proteins to convert from their native states into amyloid aggregates is associated with a range of human disorders, including Alzheimer's and Parkinson's diseases. In that sense, the use of small molecules as probes for the structural and toxic mechanism related to amyloid aggregation has become an active area of research. Compared with other compounds, the structural and molecular basis behind the inhibitory interaction of phthalocyanine tetrasulfonate (PcTS) with proteins such as αS and tau has been well established, contributing to a better understanding of the amyloid aggregation process in these proteins. We present here the structural characterization of the binding of PcTS and its Cu(II) and Zn(II)-loaded forms to the amyloid β-peptide (Aβ) and the impact of these interactions on the peptide amyloid fibril assembly. Elucidation of the PcTS binding modes to Aβ40 revealed the involvement of specific aromatic and hydrophobic interactions in the formation of the Aβ40-PcTS complex, ascribed to a binding mode in which the planarity and hydrophobicity of the aromatic ring system in the phthalocyanine act as main structural determinants for the interaction. Our results demonstrated that formation of the Aβ40-PcTS complex does not interfere with the progression of the peptide toward the formation of amyloid fibrils. On the other hand, conjugation of Zn(II) but not Cu(II) at the center of the PcTS macrocyclic ring modified substantially the binding profile of this phthalocyanine to Aβ40 and became crucial to reverse the effects of metal-free PcTS on the fibril assembly of the peptide. Overall, our results provide a firm basis to understand the structural rules directing phthalocyanine-protein interactions and their implications on the amyloid fibril assembly of the target proteins; in particular, our results contradict the hypothesis that PcTS might have similar mechanisms of action in slowing the formation of a variety of pathological aggregates.
Collapse
Affiliation(s)
- Ariel A Valiente-Gabioud
- Max Planck Laboratory for Structural Biology, Chemistry and Molecular Biophysics of Rosario (MPLbioR, UNR-MPIbpC) and Instituto de Investigaciones para el Descubrimiento de Fármacos de Rosario (IIDEFAR, UNR-CONICET), Universidad Nacional de Rosario, Ocampo y Esmeralda, Rosario, Argentina
| | - Dietmar Riedel
- Facility for Transmission Electron Microscopy, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Tiago F Outeiro
- Department of Experimental Neurodegeneration, Center for Biostructural Imaging of Neurodegeneration; Center for Nanoscale Microscopy and Molecular Physiology of the Brain, University Medical Center Göttingen, University of Göttingen, Göttingen, Germany; Max Planck Institute for Experimental Medicine, Göttingen, Germany
| | - Mauricio A Menacho-Márquez
- Max Planck Laboratory for Structural Biology, Chemistry and Molecular Biophysics of Rosario (MPLbioR, UNR-MPIbpC) and Instituto de Investigaciones para el Descubrimiento de Fármacos de Rosario (IIDEFAR, UNR-CONICET), Universidad Nacional de Rosario, Ocampo y Esmeralda, Rosario, Argentina
| | - Christian Griesinger
- Center for Nanoscale Microscopy and Molecular Physiology of the Brain, University Medical Center Göttingen, University of Göttingen, Göttingen, Germany; Department of NMR-Based Structural Biology, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Claudio O Fernández
- Max Planck Laboratory for Structural Biology, Chemistry and Molecular Biophysics of Rosario (MPLbioR, UNR-MPIbpC) and Instituto de Investigaciones para el Descubrimiento de Fármacos de Rosario (IIDEFAR, UNR-CONICET), Universidad Nacional de Rosario, Ocampo y Esmeralda, Rosario, Argentina; Department of NMR-Based Structural Biology, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany.
| |
Collapse
|
26
|
Drees L, Königsmann T, Jaspers MHJ, Pflanz R, Riedel D, Schuh R. Conserved function of the matriptase-prostasin proteolytic cascade during epithelial morphogenesis. PLoS Genet 2019; 15:e1007882. [PMID: 30601807 PMCID: PMC6331135 DOI: 10.1371/journal.pgen.1007882] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2018] [Revised: 01/14/2019] [Accepted: 12/06/2018] [Indexed: 01/08/2023] Open
Abstract
Extracellular matrix (ECM) assembly and remodelling is critical during development and organ morphogenesis. Dysregulation of ECM is implicated in many pathogenic conditions, including cancer. The type II transmembrane serine protease matriptase and the serine protease prostasin are key factors in a proteolytic cascade that regulates epithelial ECM differentiation during development in vertebrates. Here, we show by rescue experiments that the Drosophila proteases Notopleural (Np) and Tracheal-prostasin (Tpr) are functional homologues of matriptase and prostasin, respectively. Np mediates morphogenesis and remodelling of apical ECM during tracheal system development and is essential for maintenance of the transepithelial barrier function. Both Np and Tpr degrade the zona pellucida-domain (ZP-domain) protein Dumpy, a component of the transient tracheal apical ECM. Furthermore, we demonstrate that Tpr zymogen and the ZP domain of the ECM protein Piopio are cleaved by Np and matriptase in vitro. Our data indicate that the evolutionarily conserved ZP domain, present in many ECM proteins of vertebrates and invertebrates, is a novel target of the conserved matriptase-prostasin proteolytic cascade. Epithelial tissue covers the outside of the animal body and lines internal organs. Its disorganization is the source of approximately 90% of all human cancers. Elaboration of the basic epithelial characteristics has led to an understanding of how complex structures such as the branched tubular networks of vertebrate lung or invertebrate tracheal system are organized. Aside from obvious morphological differences, specific compositions of the epithelial extracellular matrix (ECM) have been noted. For example, while the flexible ECM of the vertebrate skin mainly consists of collagen and elastic fibers, the rigid ECM of invertebrates is chitin-based to serve as an inflexible exoskeleton. We show that a central regulator of ECM differentiation and epithelial development in vertebrates, the matriptase-prostasin proteolytic cascade (MPPC), is conserved and essential for both Drosophila ECM morphogenesis and physiology. The functionally conserved components of the MPPC mediate cleavage of zona pellucida-domain (ZP-domain) proteins, which play crucial roles in organizing apical structures of the ECM in both vertebrates and invertebrates. Our data indicate that ZP-proteins are molecular targets of the conserved MPPC and that cleavage within the ZP-domains is a conserved mechanism of ECM development and differentiation.
Collapse
Affiliation(s)
- Leonard Drees
- Research Group Molecular Organogenesis, Max-Planck-Institute for Biophysical Chemistry, Göttingen, Germany
| | - Tatiana Königsmann
- Research Group Molecular Organogenesis, Max-Planck-Institute for Biophysical Chemistry, Göttingen, Germany
| | - Martin H. J. Jaspers
- Research Group Molecular Organogenesis, Max-Planck-Institute for Biophysical Chemistry, Göttingen, Germany
| | - Ralf Pflanz
- Research Group Mass Spectrometry, Max-Planck-Institute for Biophysical Chemistry, Göttingen, Germany
| | - Dietmar Riedel
- Electron Microscopy Group, Max-Planck-Institute for Biophysical Chemistry, Göttingen, Germany
| | - Reinhard Schuh
- Research Group Molecular Organogenesis, Max-Planck-Institute for Biophysical Chemistry, Göttingen, Germany
- * E-mail:
| |
Collapse
|
27
|
Fuest M, Nocera GM, Modena MM, Riedel D, Mejia YX, Burg TP. Cryofixation during live-imaging enables millisecond time-correlated light and electron microscopy. J Microsc 2018; 272:87-95. [PMID: 30088278 DOI: 10.1111/jmi.12747] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2018] [Revised: 06/29/2018] [Accepted: 07/13/2018] [Indexed: 01/13/2023]
Abstract
Correlating live-cell imaging with electron microscopy is among the most promising approaches to relate dynamic functions of cells or small organisms to their underlying ultrastructure. The time correlation between light and electron micrographs, however, is limited by the sample handling and fixation required for electron microscopy. Current cryofixation methods require a sample transfer step from the light microscope to a dedicated instrument for cryofixation. This transfer step introduces a time lapse of one second or more between live imaging and the fixed state, which is studied by electron microscopy. In this work, we cryofix Caenorhabditis elegans directly within the light microscope field of view, enabling millisecond time-correlated live imaging and electron microscopy. With our approach, the time-correlation is limited only by the sample cooling rate. C. elegans was used as a model system to establish compatibility of in situ cryofixation and subsequent transmission electron microscopy (TEM). TEM images of in situ cryofixed C. elegans show that the ultrastructure of the sample was well preserved with this method. We expect that the ability to correlate live imaging and electron microscopy at the millisecond scale will enable new paradigms to study biological processes across length scales based on real-time selection and arrest of a desired state. LAY DESCRIPTION Researchers seek to link cellular functions to their smallest structural components. Currently this requires correlation of two imaging techniques, live imaging and electron microscopy. Current correlative methods, however, have limited time resolution due to the sample preparation procedures for electron microscopy. Following live imaging, samples are transferred from the light microscope to a cryofixation, or ultra-fast freezing, instrument. The biological process progresses until the sample freezes, 1 second or more after the last live image. In this work, samples are cryofixed directly within the light microscope field of view. By eliminating the transfer step, time correlation between light and electron microscopy images of our samples is limited only by the freezing rate to the order of milliseconds rather than seconds.
Collapse
Affiliation(s)
- M Fuest
- Max Planck Institute for Biophysical Chemistry, Goettingen, Germany
| | - G M Nocera
- Max Planck Institute for Biophysical Chemistry, Goettingen, Germany
| | - M M Modena
- Max Planck Institute for Biophysical Chemistry, Goettingen, Germany
| | - D Riedel
- Max Planck Institute for Biophysical Chemistry, Goettingen, Germany
| | - Y X Mejia
- Max Planck Institute for Biophysical Chemistry, Goettingen, Germany
| | - T P Burg
- Max Planck Institute for Biophysical Chemistry, Goettingen, Germany
| |
Collapse
|
28
|
Laufer M, Mohammad H, Christ DS, Riedel D, Maiss E, Varrelmann M, Liebe S. Fluorescent labelling of Beet necrotic yellow vein virus and Beet soil-borne mosaic virus for co- and superinfection experiments in Nicotiana benthamiana. J Gen Virol 2018; 99:1321-1330. [PMID: 30058995 DOI: 10.1099/jgv.0.001122] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/28/2024] Open
Abstract
Infectious full-length clones of Beet necrotic yellow vein virus (BNYVV) and Beet soil-borne mosaic virus (BSBMV), both genus Benyvirus, were used for fluorescent labelling with the objective to study their interaction in coinfection and superinfection experiments. Fluorescent labelling was achieved by replacing a part of the RNA2 encoded coat protein read-through domain with either GFP or mRFP fluorescent marker proteins. This resulted in a translational fusion comprising the coat and the fluorescent protein. The labelled viruses were infectious and moved systemically in Nicotiana benthamiana, producing wild-type-like symptoms. Virus particles could be observed by electron microscopy, demonstrating that the viral read-through domain is dispensable for particle formation. Coinfection experiments revealed a spatial separation of differentially labelled populations of both identical and different Benyvirus species after N. benthamiana agro-inoculation. Identical observations were obtained when Tobacco rattle virus (TRV) was differentially labelled and used for coinfection. In contrast, coinfections of BSBMV with Potato virus X (PVX) or TRV resulted in many co-infected cells lacking spatial separation. Micro-projectile co-bombardment of N. benthamiana leaves revealed that two differently labelled populations of the same virus co-infected only a few cells before starting to separate. In superinfection experiments with N. benthamiana, BSBMV and BNYVV were unable to establish a secondary infection in plants that were previously infected with BNYVV or BSBMV. Taken together, this is the first work to describe the interaction between two economically important Benyviruses using fluorescence-labelled full-length clones.
Collapse
Affiliation(s)
- Marlene Laufer
- 1Department of Phytopathology, Institute of Sugar Beet Research, 37079 Göttingen, Germany
| | - Hamza Mohammad
- 2Department of Phytomedicine, Plant Virology, Institute of Horticultural Production Systems, Leibniz University, 30419 Hannover, Germany
| | - Daniela S Christ
- 1Department of Phytopathology, Institute of Sugar Beet Research, 37079 Göttingen, Germany
| | - Dietmar Riedel
- 3Laboratory of Electron Microscopy, Max-Planck Institute for Biophysical Chemistry, 37077 Göttingen, Germany
| | - Edgar Maiss
- 2Department of Phytomedicine, Plant Virology, Institute of Horticultural Production Systems, Leibniz University, 30419 Hannover, Germany
| | - Mark Varrelmann
- 1Department of Phytopathology, Institute of Sugar Beet Research, 37079 Göttingen, Germany
| | - Sebastian Liebe
- 1Department of Phytopathology, Institute of Sugar Beet Research, 37079 Göttingen, Germany
| |
Collapse
|
29
|
Hwang S, Fricke P, Zinke M, Giller K, Wall JS, Riedel D, Becker S, Lange A. Comparison of the 3D structures of mouse and human α-synuclein fibrils by solid-state NMR and STEM. J Struct Biol 2018; 206:43-48. [PMID: 29678776 PMCID: PMC6470123 DOI: 10.1016/j.jsb.2018.04.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2018] [Revised: 04/05/2018] [Accepted: 04/15/2018] [Indexed: 01/23/2023]
Abstract
Intra-neuronal aggregation of α-synuclein into fibrils is the molecular basis for α-synucleinopathies, such as Parkinson's disease. The atomic structure of human α-synuclein (hAS) fibrils was recently determined by Tuttle et al. using solid-state NMR (ssNMR). The previous study found that hAS fibrils are composed of a single protofilament. Here, we have investigated the structure of mouse α-synuclein (mAS) fibrils by STEM and isotope-dilution ssNMR experiments. We found that in contrast to hAS, mAS fibrils consist of two or even three protofilaments which are connected by rather weak interactions in between them. Although the number of protofilaments appears to be different between hAS and mAS, we found that they have a remarkably similar secondary structure and protofilament 3D structure as judged by secondary chemical shifts and intra-molecular distance restraints. We conclude that the two mutant sites between hAS and mAS (positions 53 and 87) in the fibril core region are crucial for determining the quaternary structure of α-synuclein fibrils.
Collapse
Affiliation(s)
- Songhwan Hwang
- Department of Molecular Biophysics, Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP), 13125 Berlin, Germany
| | - Pascal Fricke
- Department of Molecular Biophysics, Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP), 13125 Berlin, Germany
| | - Maximilian Zinke
- Department of Molecular Biophysics, Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP), 13125 Berlin, Germany
| | - Karin Giller
- Department of NMR-based Structural Biology, Max Planck Institute for Biophysical Chemistry, 37077 Göttingen, Germany
| | - Joseph S Wall
- Brookhaven National Laboratory, Upton, 11967 NY, USA
| | - Dietmar Riedel
- Electron Microscopy Group, Max Planck Institute for Biophysical Chemistry, 37077 Göttingen, Germany
| | - Stefan Becker
- Department of NMR-based Structural Biology, Max Planck Institute for Biophysical Chemistry, 37077 Göttingen, Germany
| | - Adam Lange
- Department of Molecular Biophysics, Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP), 13125 Berlin, Germany; Institut für Biologie, Humboldt-Universität zu Berlin, 10115 Berlin, Germany.
| |
Collapse
|
30
|
Stoldt S, Wenzel D, Kehrein K, Riedel D, Ott M, Jakobs S. Spatial orchestration of mitochondrial translation and OXPHOS complex assembly. Nat Cell Biol 2018; 20:528-534. [PMID: 29662179 DOI: 10.1038/s41556-018-0090-7] [Citation(s) in RCA: 68] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2017] [Accepted: 03/20/2018] [Indexed: 12/11/2022]
Abstract
Oxidative phosphorylation (OXPHOS) is vital for the regeneration of the vast majority of ATP in eukaryotic cells 1 . OXPHOS is carried out by large multi-subunit protein complexes in the cristae membranes, which are invaginations of the mitochondrial inner membrane. The OXPHOS complexes are a mix of subunits encoded in the nuclear and mitochondrial genomes. Thus, the assembly of these dual-origin complexes is an enormous logistical challenge for the cell. Using super-resolution microscopy (nanoscopy) and quantitative cryo-immunogold electron microscopy, we determined where specific transcripts are translated and where distinct assembly steps of the dual-origin complexes in the yeast Saccharomyces cerevisiae occur. Our data indicate that the mitochondrially encoded proteins of complex III and complex IV are preferentially inserted in different sites of the inner membrane than those of complex V. We further demonstrate that the early, but not the late, assembly steps of complex III and complex IV occur preferentially in the inner boundary membrane. By contrast, all steps of complex V assembly occur mainly in the cristae membranes. Thus, OXPHOS complex assembly is spatially well orchestrated, probably representing an unappreciated regulatory layer in mitochondrial biogenesis.
Collapse
Affiliation(s)
- Stefan Stoldt
- Department of NanoBiophotonics, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Dirk Wenzel
- Laboratory of Electron Microscopy, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Kirsten Kehrein
- Department of Biochemistry and Biophysics, Stockholm University, Stockholm, Sweden
| | - Dietmar Riedel
- Laboratory of Electron Microscopy, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Martin Ott
- Department of Biochemistry and Biophysics, Stockholm University, Stockholm, Sweden
| | - Stefan Jakobs
- Department of NanoBiophotonics, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany. .,Department of Neurology, University Medical Center Göttingen, Göttingen, Germany.
| |
Collapse
|
31
|
Krukenberg V, Riedel D, Gruber-Vodicka HR, Buttigieg PL, Tegetmeyer HE, Boetius A, Wegener G. Gene expression and ultrastructure of meso- and thermophilic methanotrophic consortia. Environ Microbiol 2018; 20:1651-1666. [PMID: 29468803 PMCID: PMC5947290 DOI: 10.1111/1462-2920.14077] [Citation(s) in RCA: 60] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2017] [Revised: 02/15/2018] [Accepted: 02/15/2018] [Indexed: 11/27/2022]
Abstract
The sulfate‐dependent, anaerobic oxidation of methane (AOM) is an important sink for methane in marine environments. It is carried out between anaerobic methanotrophic archaea (ANME) and sulfate‐reducing bacteria (SRB) living in syntrophic partnership. In this study, we compared the genomes, gene expression patterns and ultrastructures of three phylogenetically different microbial consortia found in hydrocarbon‐rich environments under different temperature regimes: ANME‐1a/HotSeep‐1 (60°C), ANME‐1a/Seep‐SRB2 (37°C) and ANME‐2c/Seep‐SRB2 (20°C). All three ANME encode a reverse methanogenesis pathway: ANME‐2c encodes all enzymes, while ANME‐1a lacks the gene for N5,N10‐methylene tetrahydromethanopterin reductase (mer) and encodes a methylenetetrahydrofolate reductase (Met). The bacterial partners contain the genes encoding the canonical dissimilatory sulfate reduction pathway. During AOM, all three consortia types highly expressed genes encoding for the formation of flagella or type IV pili and/or c‐type cytochromes, some predicted to be extracellular. ANME‐2c expressed potentially extracellular cytochromes with up to 32 hemes, whereas ANME‐1a and SRB expressed less complex cytochromes (≤ 8 and ≤ 12 heme respectively). The intercellular space of all consortia showed nanowire‐like structures and heme‐rich areas. These features are proposed to enable interspecies electron exchange, hence suggesting that direct electron transfer is a common mechanism to sulfate‐dependent AOM, and that both partners synthesize molecules to enable it.
Collapse
Affiliation(s)
- Viola Krukenberg
- Max Planck Institute for Marine Microbiology, Bremen, 28359, Germany
| | - Dietmar Riedel
- Max Planck Institute for Biophysical Chemistry, Göttingen, 37077, Germany
| | | | - Pier Luigi Buttigieg
- Alfred Wegener Institute, Helmholtz Center for Polar and Marine Research, Bremerhaven, 27570, Germany
| | - Halina E Tegetmeyer
- Alfred Wegener Institute, Helmholtz Center for Polar and Marine Research, Bremerhaven, 27570, Germany.,Center for Biotechnology, Bielefeld University, Bielefeld, 33615, Germany
| | - Antje Boetius
- Max Planck Institute for Marine Microbiology, Bremen, 28359, Germany.,Alfred Wegener Institute, Helmholtz Center for Polar and Marine Research, Bremerhaven, 27570, Germany.,MARUM, Center for Marine Environmental Sciences, University Bremen, Bremen, 28359, Germany
| | - Gunter Wegener
- Max Planck Institute for Marine Microbiology, Bremen, 28359, Germany.,MARUM, Center for Marine Environmental Sciences, University Bremen, Bremen, 28359, Germany
| |
Collapse
|
32
|
Ambadipudi S, Biernat J, Riedel D, Mandelkow E, Zweckstetter M. Liquid-liquid phase separation of the microtubule-binding repeats of the Alzheimer-related protein Tau. Nat Commun 2017; 8:275. [PMID: 28819146 PMCID: PMC5561136 DOI: 10.1038/s41467-017-00480-0] [Citation(s) in RCA: 435] [Impact Index Per Article: 62.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2017] [Accepted: 06/30/2017] [Indexed: 02/08/2023] Open
Abstract
The protein Tau aggregates into tangles in the brain of patients with Alzheimer’s disease. In solution, however, Tau is intrinsically disordered, highly soluble, and binds to microtubules. It is still unclear what initiates the conversion from an innocuous phase of high solubility and functionality to solid-like neurotoxic deposits. Here, we show that the microtubule-binding repeats of Tau, which are lysine-rich, undergo liquid–liquid phase separation in solution. Liquid–liquid demixing causes molecular crowding of amyloid-promoting elements of Tau and drives electrostatic coacervation. Furthermore, we demonstrate that three-repeat and four-repeat isoforms of Tau differ in their ability for demixing. Alternative splicing of Tau can thus regulate the formation of Tau-containing membrane-less compartments. In addition, phosphorylation of Tau repeats promotes liquid–liquid phase separation at cellular protein conditions. The combined data propose a mechanism in which liquid droplets formed by the positively charged microtubule-binding domain of Tau undergo coacervation with negatively charged molecules to promote amyloid formation. Tau forms aggregates in the brains of Alzheimer patients. Here, the authors identify conditions, where the microtubule-binding repeats of Tau undergo a phosphorylation-dependent liquid–liquid phase separation, leading to molecular crowding in the formed Tau liquid droplets and characterize them by NMR and other biophysical methods.
Collapse
Affiliation(s)
- Susmitha Ambadipudi
- Deutsches Zentrum für Neurodegenerative Erkrankungen (DZNE), von-Siebold-Str. 3a, 37075, Göttingen, Germany
| | - Jacek Biernat
- Deutsches Zentrum für Neurodegenerative Erkrankungen (DZNE), Ludwig-Erhard-Allee 2, 53175, Bonn, Germany
| | - Dietmar Riedel
- Max-Planck-Institut für Biophysikalische Chemie, Am Fassberg 11, 37077, Göttingen, Germany
| | - Eckhard Mandelkow
- Deutsches Zentrum für Neurodegenerative Erkrankungen (DZNE), Ludwig-Erhard-Allee 2, 53175, Bonn, Germany.,CAESAR Research Center, Bonn, and MPI for Metabolism Research, Hamburg Outstation, 22607, Hamburg, Germany
| | - Markus Zweckstetter
- Deutsches Zentrum für Neurodegenerative Erkrankungen (DZNE), von-Siebold-Str. 3a, 37075, Göttingen, Germany. .,Max-Planck-Institut für Biophysikalische Chemie, Am Fassberg 11, 37077, Göttingen, Germany. .,Department of Neurology, University Medical Center Göttingen, University of Göttingen, Waldweg 33, 37073, Göttingen, Germany.
| |
Collapse
|
33
|
Levinson K, Ojalvo L, Riedel D, Chan W, Africano A, Fader A, Rositch A. Suboptimal treatment of HIV+ women with advanced gynecologic cancer. Gynecol Oncol 2017. [DOI: 10.1016/j.ygyno.2017.03.394] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
34
|
Sirbu L, Ghosh S, Riedel D. Assessing Clinician Compliance with National Guidelines for Pediatric HIV
Care and Treatment in Rwanda. Ann Glob Health 2017. [DOI: 10.1016/j.aogh.2017.03.312] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
|
35
|
Hamann E, Tegetmeyer HE, Riedel D, Littmann S, Ahmerkamp S, Chen J, Hach PF, Strous M. Syntrophic linkage between predatory Carpediemonas and specific prokaryotic populations. ISME J 2017; 11:1205-1217. [PMID: 28211847 PMCID: PMC5437931 DOI: 10.1038/ismej.2016.197] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/02/2016] [Revised: 10/28/2016] [Accepted: 12/07/2016] [Indexed: 12/21/2022]
Abstract
Most anoxic environments are populated by small (<10 μm) heterotrophic eukaryotes that prey on different microbial community members. How predatory eukaryotes engage in beneficial interactions with other microbes has rarely been investigated so far. Here, we studied an example of such an interaction by cultivating the anerobic marine flagellate, Carpediemonas frisia sp. nov. (supergroup Excavata), with parts of its naturally associated microbiome. This microbiome consisted of so far uncultivated members of the Deltaproteobacteria, Bacteroidetes, Firmicutes, Verrucomicrobia and Nanoarchaeota. Using genome and transcriptome informed metabolic network modeling, we showed that Carpediemonas stimulated prokaryotic growth through the release of predigested biomolecules such as proteins, sugars, organic acids and hydrogen. Transcriptional gene activities suggested niche separation between biopolymer degrading Bacteroidetes, monomer utilizing Firmicutes and Nanoarchaeota and hydrogen oxidizing Deltaproteobacteria. An efficient metabolite exchange between the different community members appeared to be promoted by the formation of multispecies aggregates. Physiological experiments showed that Carpediemonas could also benefit from an association to these aggregates, as it facilitated the removal of inhibiting metabolites and increased the availability of prey bacteria. Taken together, our results provide a framework to understand how predatory microbial eukaryotes engage, across trophic levels, in beneficial interactions with specific prokaryotic populations.
Collapse
Affiliation(s)
- Emmo Hamann
- Department of Geoscience, University of Calgary, Calgary, AB, Canada.,Max Planck Institute for Marine Microbiology, Bremen, Germany
| | - Halina E Tegetmeyer
- Max Planck Institute for Marine Microbiology, Bremen, Germany.,Institute for Genome Research and Systems Biology, Center for Biotechnology, Bielefeld University, Bielefeld, Germany
| | - Dietmar Riedel
- Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Sten Littmann
- Max Planck Institute for Marine Microbiology, Bremen, Germany
| | | | - Jianwei Chen
- Department of Geoscience, University of Calgary, Calgary, AB, Canada.,Max Planck Institute for Marine Microbiology, Bremen, Germany
| | - Philipp F Hach
- Max Planck Institute for Marine Microbiology, Bremen, Germany
| | - Marc Strous
- Department of Geoscience, University of Calgary, Calgary, AB, Canada.,Max Planck Institute for Marine Microbiology, Bremen, Germany.,Institute for Genome Research and Systems Biology, Center for Biotechnology, Bielefeld University, Bielefeld, Germany
| |
Collapse
|
36
|
Pesch YY, Riedel D, Behr M. Drosophila Chitinase 2 is expressed in chitin producing organs for cuticle formation. Arthropod Struct Dev 2017; 46:4-12. [PMID: 27832982 DOI: 10.1016/j.asd.2016.11.002] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2016] [Revised: 11/01/2016] [Accepted: 11/02/2016] [Indexed: 06/06/2023]
Abstract
The architecture of the outer body wall cuticle is fundamental to protect arthropods against invading pathogens and numerous other harmful stresses. Such robust cuticles are formed by parallel running chitin microfibrils. Molting and also local wounding leads to dynamic assembly and disassembly of the chitin-matrix throughout development. However, the underlying molecular mechanisms that organize proper chitin-matrix formation are poorly known. Recently we identified a key region for cuticle thickening at the apical cell surface, the cuticle assembly zone, where Obstructor-A (Obst-A) coordinates the formation of the chitin-matrix. Obst-A binds chitin and the deacetylase Serpentine (Serp) in a core complex, which is required for chitin-matrix maturation and preservation. Here we present evidence that Chitinase 2 (Cht2) could be essential for this molecular machinery. We show that Cht2 is expressed in the chitin-matrix of epidermis, trachea, and the digestive system. There, Cht2 is enriched at the apical cell surface and the dense chitin-matrix. We further show that in Cht2 knockdown larvae the assembly zone is rudimentary, preventing normal cuticle formation and pore canal organization. As sequence similarities of Cht2 and the core complex proteins indicate evolutionarily conserved molecular mechanisms, our findings suggest that Cht2 is involved in chitin formation also in other insects.
Collapse
Affiliation(s)
- Yanina-Yasmin Pesch
- Institute for Biology and Sächsischer Inkubator für klinische Translation (TRM/SIKT), University of Leipzig, 04103 Leipzig, Germany; Life & Medical Sciences Institute (LIMES), University of Bonn, 53115 Bonn, Germany
| | - Dietmar Riedel
- Max Planck Institute for Biophysical Chemistry, Electron Microscopy Group, 37077 Göttingen, Germany
| | - Matthias Behr
- Institute for Biology and Sächsischer Inkubator für klinische Translation (TRM/SIKT), University of Leipzig, 04103 Leipzig, Germany; Life & Medical Sciences Institute (LIMES), University of Bonn, 53115 Bonn, Germany.
| |
Collapse
|
37
|
Laso-Pérez R, Wegener G, Knittel K, Widdel F, Harding KJ, Krukenberg V, Meier DV, Richter M, Tegetmeyer HE, Riedel D, Richnow HH, Adrian L, Reemtsma T, Lechtenfeld OJ, Musat F. Thermophilic archaea activate butane via alkyl-coenzyme M formation. Nature 2016; 539:396-401. [PMID: 27749816 DOI: 10.1038/nature20152] [Citation(s) in RCA: 216] [Impact Index Per Article: 27.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2016] [Accepted: 10/11/2016] [Indexed: 12/25/2022]
Abstract
The anaerobic formation and oxidation of methane involve unique enzymatic mechanisms and cofactors, all of which are believed to be specific for C1-compounds. Here we show that an anaerobic thermophilic enrichment culture composed of dense consortia of archaea and bacteria apparently uses partly similar pathways to oxidize the C4 hydrocarbon butane. The archaea, proposed genus 'Candidatus Syntrophoarchaeum', show the characteristic autofluorescence of methanogens, and contain highly expressed genes encoding enzymes similar to methyl-coenzyme M reductase. We detect butyl-coenzyme M, indicating archaeal butane activation analogous to the first step in anaerobic methane oxidation. In addition, Ca. Syntrophoarchaeum expresses the genes encoding β-oxidation enzymes, carbon monoxide dehydrogenase and reversible C1 methanogenesis enzymes. This allows for the complete oxidation of butane. Reducing equivalents are seemingly channelled to HotSeep-1, a thermophilic sulfate-reducing partner bacterium known from the anaerobic oxidation of methane. Genes encoding 16S rRNA and methyl-coenzyme M reductase similar to those identifying Ca. Syntrophoarchaeum were repeatedly retrieved from marine subsurface sediments, suggesting that the presented activation mechanism is naturally widespread in the anaerobic oxidation of short-chain hydrocarbons.
Collapse
Affiliation(s)
- Rafael Laso-Pérez
- Max-Planck Institute for Marine Microbiology, 28359 Bremen, Germany.,Alfred Wegener Institute Helmholtz Center for Polar and Marine Research, 27570 Bremerhaven, Germany
| | - Gunter Wegener
- Max-Planck Institute for Marine Microbiology, 28359 Bremen, Germany.,Alfred Wegener Institute Helmholtz Center for Polar and Marine Research, 27570 Bremerhaven, Germany.,MARUM, Center for Marine Environmental Sciences, University Bremen, 28359 Bremen, Germany
| | - Katrin Knittel
- Max-Planck Institute for Marine Microbiology, 28359 Bremen, Germany
| | - Friedrich Widdel
- Max-Planck Institute for Marine Microbiology, 28359 Bremen, Germany
| | - Katie J Harding
- Max-Planck Institute for Marine Microbiology, 28359 Bremen, Germany
| | - Viola Krukenberg
- Max-Planck Institute for Marine Microbiology, 28359 Bremen, Germany.,Alfred Wegener Institute Helmholtz Center for Polar and Marine Research, 27570 Bremerhaven, Germany
| | - Dimitri V Meier
- Max-Planck Institute for Marine Microbiology, 28359 Bremen, Germany
| | - Michael Richter
- Max-Planck Institute for Marine Microbiology, 28359 Bremen, Germany
| | - Halina E Tegetmeyer
- Alfred Wegener Institute Helmholtz Center for Polar and Marine Research, 27570 Bremerhaven, Germany.,Center for Biotechnology, Bielefeld University, 33615 Bielefeld, Germany
| | - Dietmar Riedel
- Max Planck Institute for Biophysical Chemistry, 37077 Göttingen, Germany
| | | | - Lorenz Adrian
- Helmholtz Centre for Environmental Research - UFZ, 04318 Leipzig, Germany
| | - Thorsten Reemtsma
- Helmholtz Centre for Environmental Research - UFZ, 04318 Leipzig, Germany
| | | | - Florin Musat
- Max-Planck Institute for Marine Microbiology, 28359 Bremen, Germany.,Helmholtz Centre for Environmental Research - UFZ, 04318 Leipzig, Germany
| |
Collapse
|
38
|
Nemajerova A, Kramer D, Siller S, Herr C, Shomroni O, Pena T, Gallinas Suazo C, Glaser K, Wildung M, Steffen H, Sriraman A, Oberle F, Wienken M, Hennion M, Vidal R, Royen B, Alevra M, Schild D, Bals R, Dönitz J, Riedel D, Bonn S, Takemaru KI, Moll U, Lizé M. TAp73 is a central transcriptional regulator of airway multiciliogenesis and protects bronchial function. Pneumologie 2016. [DOI: 10.1055/s-0036-1592291] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
39
|
Nwandu A, Claassen C, Riedel D, Madubuko T, Onu E, Olutola A, Onyekonwu C, Nwobi E, Ezeanolue E. The effectiveness of a comprehensive four-week course in HIV medicine for
postgraduate doctors at University of Nigeria. Ann Glob Health 2016. [DOI: 10.1016/j.aogh.2016.04.334] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
|
40
|
Hamann E, Gruber-Vodicka H, Kleiner M, Tegetmeyer HE, Riedel D, Littmann S, Chen J, Milucka J, Viehweger B, Becker KW, Dong X, Stairs CW, Hinrichs KU, Brown MW, Roger AJ, Strous M. Environmental Breviatea harbour mutualistic Arcobacter epibionts. Nature 2016; 534:254-8. [PMID: 27279223 PMCID: PMC4900452 DOI: 10.1038/nature18297] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2015] [Accepted: 05/05/2016] [Indexed: 11/09/2022]
Abstract
Breviatea form a lineage of free living, unicellular protists, distantly related to animals and fungi. This lineage emerged almost one billion years ago, when the oceanic oxygen content was low, and extant Breviatea have evolved or retained an anaerobic lifestyle. Here we report the cultivation of Lenisia limosa, gen. et sp. nov., a newly discovered breviate colonized by relatives of animal-associated Arcobacter. Physiological experiments show that the association of L. limosa with Arcobacter is driven by the transfer of hydrogen and is mutualistic, providing benefits to both partners. With whole-genome sequencing and differential proteomics, we show that an experimentally observed fitness gain of L. limosa could be explained by the activity of a so far unknown type of NAD(P)H-accepting hydrogenase, which is expressed in the presence, but not in the absence, of Arcobacter. Differential proteomics further reveal that the presence of Lenisia stimulates expression of known 'virulence' factors by Arcobacter. These proteins typically enable colonization of animal cells during infection, but may in the present case act for mutual benefit. Finally, re-investigation of two currently available transcriptomic data sets of other Breviatea reveals the presence and activity of related hydrogen-consuming Arcobacter, indicating that mutualistic interaction between these two groups of microbes might be pervasive. Our results support the notion that molecular mechanisms involved in virulence can also support mutualism, as shown here for Arcobacter and Breviatea.
Collapse
Affiliation(s)
- Emmo Hamann
- Microbial Fitness Group, Max Planck Institute for Marine Microbiology, Celsiusstraße 1, 28359 Bremen, Germany
- Department of Geoscience, University of Calgary, Calgary, 2500 University Drive Northwest, Alberta T2N 1N4, Canada
| | - Harald Gruber-Vodicka
- Symbiosis Department, Max Planck Institute for Marine Microbiology, Celsiusstraße 1, 28359 Bremen, Germany
| | - Manuel Kleiner
- Department of Geoscience, University of Calgary, Calgary, 2500 University Drive Northwest, Alberta T2N 1N4, Canada
| | - Halina E Tegetmeyer
- Microbial Fitness Group, Max Planck Institute for Marine Microbiology, Celsiusstraße 1, 28359 Bremen, Germany
- Institute for Genome Research and Systems Biology, Center for Biotechnology, University of Bielefeld, Universitätsstraße 25, 3615 Bielefeld, Germany
| | - Dietmar Riedel
- Max Planck Institute for Biophysical Chemistry, Am Faßberg 11, 37077 Göttingen, Germany
| | - Sten Littmann
- Biogeochemistry Department, Max Planck Institute for Marine Microbiology, Celsiusstraße 1, 28359 Bremen, Germany
| | - Jianwei Chen
- Microbial Fitness Group, Max Planck Institute for Marine Microbiology, Celsiusstraße 1, 28359 Bremen, Germany
- Department of Geoscience, University of Calgary, Calgary, 2500 University Drive Northwest, Alberta T2N 1N4, Canada
| | - Jana Milucka
- Biogeochemistry Department, Max Planck Institute for Marine Microbiology, Celsiusstraße 1, 28359 Bremen, Germany
| | - Bernhard Viehweger
- MARUM Centre for Marine Environmental Sciences, Bibliothekstraße 1, University of Bremen, 28359 Bremen, Germany
| | - Kevin W Becker
- MARUM Centre for Marine Environmental Sciences, Bibliothekstraße 1, University of Bremen, 28359 Bremen, Germany
| | - Xiaoli Dong
- Department of Geoscience, University of Calgary, Calgary, 2500 University Drive Northwest, Alberta T2N 1N4, Canada
| | - Courtney W Stairs
- Centre for Comparative Genomics and Evolutionary Bioinformatics, Department of Biochemistry and Molecular Biology, 6299 South Street, Dalhousie University, Halifax, Nova Scotia B3H 4R2, Canada
| | - Kai-Uwe Hinrichs
- MARUM Centre for Marine Environmental Sciences, Bibliothekstraße 1, University of Bremen, 28359 Bremen, Germany
| | - Matthew W Brown
- Department of Biological Sciences, Mississippi State University, Mississippi State, Mississippi 39762, USA
| | - Andrew J Roger
- Centre for Comparative Genomics and Evolutionary Bioinformatics, Department of Biochemistry and Molecular Biology, 6299 South Street, Dalhousie University, Halifax, Nova Scotia B3H 4R2, Canada
| | - Marc Strous
- Microbial Fitness Group, Max Planck Institute for Marine Microbiology, Celsiusstraße 1, 28359 Bremen, Germany
- Department of Geoscience, University of Calgary, Calgary, 2500 University Drive Northwest, Alberta T2N 1N4, Canada
- Institute for Genome Research and Systems Biology, Center for Biotechnology, University of Bielefeld, Universitätsstraße 25, 3615 Bielefeld, Germany
| |
Collapse
|
41
|
Nemajerova A, Kramer D, Siller SS, Herr C, Shomroni O, Pena T, Gallinas Suazo C, Glaser K, Wildung M, Steffen H, Sriraman A, Oberle F, Wienken M, Hennion M, Vidal R, Royen B, Alevra M, Schild D, Bals R, Dönitz J, Riedel D, Bonn S, Takemaru KI, Moll UM, Lizé M. TAp73 is a central transcriptional regulator of airway multiciliogenesis. Genes Dev 2016; 30:1300-12. [PMID: 27257214 PMCID: PMC4911929 DOI: 10.1101/gad.279836.116] [Citation(s) in RCA: 94] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2016] [Accepted: 05/02/2016] [Indexed: 01/25/2023]
Abstract
In this study, Nemajerova et al. identify TP73, a p53 homolog, as a key regulator of airway multiciliogenesis. They show that mice with TP73 deficiency suffer from chronic respiratory tract infections due to profound defects in ciliogenesis and complete loss of mucociliary clearance and identify the downstream components of TP73 during multiciliogenesis. Motile multiciliated cells (MCCs) have critical roles in respiratory health and disease and are essential for cleaning inhaled pollutants and pathogens from airways. Despite their significance for human disease, the transcriptional control that governs multiciliogenesis remains poorly understood. Here we identify TP73, a p53 homolog, as governing the program for airway multiciliogenesis. Mice with TP73 deficiency suffer from chronic respiratory tract infections due to profound defects in ciliogenesis and complete loss of mucociliary clearance. Organotypic airway cultures pinpoint TAp73 as necessary and sufficient for basal body docking, axonemal extension, and motility during the differentiation of MCC progenitors. Mechanistically, cross-species genomic analyses and complete ciliary rescue of knockout MCCs identify TAp73 as the conserved central transcriptional integrator of multiciliogenesis. TAp73 directly activates the key regulators FoxJ1, Rfx2, Rfx3, and miR34bc plus nearly 50 structural and functional ciliary genes, some of which are associated with human ciliopathies. Our results position TAp73 as a novel central regulator of MCC differentiation.
Collapse
Affiliation(s)
- Alice Nemajerova
- Department of Pathology, Stony Brook University, Stony Brook, New York 11794, USA
| | - Daniela Kramer
- Institute of Molecular Oncology, Göttingen University, 37077 Göttingen, Germany
| | - Saul S Siller
- Department of Pharmacology, Stony Brook University, Stony Brook, New York 11794, USA
| | - Christian Herr
- Department of Internal Medicine V, Saarland University, Homburg 66421, Germany
| | - Orr Shomroni
- Computational Systems Biology, German Center for Neurodegenerative Diseases, 37077 Göttingen, Germany
| | - Tonatiuh Pena
- Computational Systems Biology, German Center for Neurodegenerative Diseases, 37077 Göttingen, Germany
| | | | - Katharina Glaser
- Institute of Molecular Oncology, Göttingen University, 37077 Göttingen, Germany
| | - Merit Wildung
- Institute of Molecular Oncology, Göttingen University, 37077 Göttingen, Germany
| | - Henrik Steffen
- Institute of Molecular Oncology, Göttingen University, 37077 Göttingen, Germany
| | - Anusha Sriraman
- Institute of Molecular Oncology, Göttingen University, 37077 Göttingen, Germany
| | - Fabian Oberle
- Institute of Molecular Oncology, Göttingen University, 37077 Göttingen, Germany
| | - Magdalena Wienken
- Institute of Molecular Oncology, Göttingen University, 37077 Göttingen, Germany
| | - Magali Hennion
- Computational Systems Biology, German Center for Neurodegenerative Diseases, 37077 Göttingen, Germany
| | - Ramon Vidal
- Computational Systems Biology, German Center for Neurodegenerative Diseases, 37077 Göttingen, Germany
| | - Bettina Royen
- Department of Neurophysiology and Cellular Biophysics, Göttingen University, 37073 Göttingen, Germany
| | - Mihai Alevra
- Department of Neurophysiology and Cellular Biophysics, Göttingen University, 37073 Göttingen, Germany
| | - Detlev Schild
- Department of Neurophysiology and Cellular Biophysics, Göttingen University, 37073 Göttingen, Germany
| | - Robert Bals
- Department of Internal Medicine V, Saarland University, Homburg 66421, Germany
| | - Jürgen Dönitz
- Department of Evolutionary Developmental Genetics, Göttingen University, 37077 Göttingen, Germany
| | - Dietmar Riedel
- Electron Microscopy, Max-Planck-Institute for Biophysical Chemistry, 37077 Göttingen, Germany
| | - Stefan Bonn
- Computational Systems Biology, German Center for Neurodegenerative Diseases, 37077 Göttingen, Germany
| | - Ken-Ichi Takemaru
- Department of Pharmacology, Stony Brook University, Stony Brook, New York 11794, USA
| | - Ute M Moll
- Department of Pathology, Stony Brook University, Stony Brook, New York 11794, USA; Institute of Molecular Oncology, Göttingen University, 37077 Göttingen, Germany
| | - Muriel Lizé
- Institute of Molecular Oncology, Göttingen University, 37077 Göttingen, Germany; Clinic for Cardiology and Pneumology, Department of Pneumology, University Medical Center Göttingen, 37099 Göttingen, Germany
| |
Collapse
|
42
|
Farsi Z, Preobraschenski J, van den Bogaart G, Riedel D, Jahn R, Woehler A. Single-vesicle imaging reveals different transport mechanisms between glutamatergic and GABAergic vesicles. Science 2016; 351:981-4. [DOI: 10.1126/science.aad8142] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2015] [Accepted: 01/14/2016] [Indexed: 12/13/2022]
|
43
|
Abstract
Oogenesis is an essential cellular and developmental process to prepare the oocyte for propagation of a species after fertilization. Oocytes of oviparous animals are enormous cells endowed with many, big cellular compartments, which are interconnected through active intracellular transport. The dynamic transport pathways and the big organelles of the oocyte provide the opportunity to study cellular trafficking with outstanding resolution. Hence, oocytes were classically used to investigate cellular compartments. Though many novel regulators of vesicle trafficking have been discovered in yeast, tissue culture cells and invertebrates, recent forward genetic screens in invertebrate and vertebrate oocytes isolated novel control proteins specific to multicellular organisms. Zebrafish is a widely used vertebrate model to study cellular and developmental processes in an entire animal. The transparency of zebrafish embryos allows following cellular events during early development with in vivo imaging. Unfortunately, the active endocytosis of the oocyte also represents a drawback for imaging. The massive amounts of yolk globules prevent the penetration of light-beams and currently make in vivo microscopy a challenge. As a consequence, electron microscopy (EM) still provides the highest resolution to analyze the ultra-structural details of compartments and organelles and the mechanisms controlling many cellular pathways of the oocyte. Among different fixation approaches for EM, High Pressure Freezing (HPF) in combination with freeze substitution significantly improves the samples preservation closest to their natural status. Here, we describe the HPF with freeze substitution embedding method for analyzing cellular processes in zebrafish oocytes using electron microscopy.
Collapse
Affiliation(s)
- Palsamy Kanagaraj
- Institut für Entwicklungsbiochemie, Georg-August Universität Göttingen, Justus-von-Liebig-Weg 11, 37077, Göttingen, Germany
| | - Dietmar Riedel
- Max-Planck Institut für Biophysikalische Chemie, Göttingen, Germany
| | - Roland Dosch
- Institut für Entwicklungsbiochemie, Georg-August Universität Göttingen, Justus-von-Liebig-Weg 11, 37077, Göttingen, Germany.
| |
Collapse
|
44
|
Goudarzi M, Mildner K, Babatz F, Riedel D, Klämbt C, Zeuschner D, Raz E. Correlative Light and Electron Microscopy of Rare Cell Populations in Zebrafish Embryos Using Laser Marks. Zebrafish 2015; 12:470-3. [PMID: 26448280 PMCID: PMC4677546 DOI: 10.1089/zeb.2015.1148] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
Affiliation(s)
- Mohammad Goudarzi
- 1 Institute of Cell Biology, ZMBE, University of Münster , Münster, Germany
| | - Karina Mildner
- 2 Electron Microscopy Unit, Max Planck Institute for Molecular Biomedicine , Münster, Germany
| | - Felix Babatz
- 3 Institute for Neurobiology, University of Münster , Münster, Germany
| | - Dietmar Riedel
- 4 Electron Microscopy Group, Max-Planck-Institute for Biophysical Chemistry , Göttingen, Germany
| | - Christian Klämbt
- 3 Institute for Neurobiology, University of Münster , Münster, Germany
| | - Dagmar Zeuschner
- 2 Electron Microscopy Unit, Max Planck Institute for Molecular Biomedicine , Münster, Germany
| | - Erez Raz
- 1 Institute of Cell Biology, ZMBE, University of Münster , Münster, Germany
| |
Collapse
|
45
|
Kost N, Kaiser S, Ostwal Y, Riedel D, Stützer A, Nikolov M, Rathke C, Renkawitz-Pohl R, Fischle W. Multimerization of Drosophila sperm protein Mst77F causes a unique condensed chromatin structure. Nucleic Acids Res 2015; 43:3033-45. [PMID: 25735749 PMCID: PMC4381051 DOI: 10.1093/nar/gkv015] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2014] [Accepted: 01/08/2015] [Indexed: 01/09/2023] Open
Abstract
Despite insights on the cellular level, the molecular details of chromatin reorganization in sperm development, which involves replacement of histone proteins by specialized factors to allow ultra most condensation of the genome, are not well understood. Protamines are dispensable for DNA condensation during Drosophila post-meiotic spermatogenesis. Therefore, we analyzed the interaction of Mst77F, another very basic testis-specific protein with chromatin and DNA as well as studied the molecular consequences of such binding. We show that Mst77F on its own causes severe chromatin and DNA aggregation. An intrinsically unstructured domain in the C-terminus of Mst77F binds DNA via electrostatic interaction. This binding results in structural reorganization of the domain, which induces interaction with an N-terminal region of the protein. Via putative cooperative effects Mst77F is induced to multimerize in this state causing DNA aggregation. In agreement, overexpression of Mst77F results in chromatin aggregation in fly sperm. Based on these findings we postulate that Mst77F is crucial for sperm development by giving rise to a unique condensed chromatin structure.
Collapse
Affiliation(s)
- Nils Kost
- Laboratory of Chromatin Biochemistry, Max Planck Institute for Biophysical Chemistry, 37077 Göttingen, Germany
| | - Sophie Kaiser
- Developmental Biology, FB17, Philipps University, 35037 Marburg, Germany
| | - Yogesh Ostwal
- Laboratory of Chromatin Biochemistry, Max Planck Institute for Biophysical Chemistry, 37077 Göttingen, Germany
| | - Dietmar Riedel
- Electron Microscopy Group, Max Planck Institute for Biophysical Chemistry, 37077 Göttingen, Germany
| | - Alexandra Stützer
- Laboratory of Chromatin Biochemistry, Max Planck Institute for Biophysical Chemistry, 37077 Göttingen, Germany
| | - Miroslav Nikolov
- Laboratory of Chromatin Biochemistry, Max Planck Institute for Biophysical Chemistry, 37077 Göttingen, Germany
| | - Christina Rathke
- Developmental Biology, FB17, Philipps University, 35037 Marburg, Germany
| | | | - Wolfgang Fischle
- Laboratory of Chromatin Biochemistry, Max Planck Institute for Biophysical Chemistry, 37077 Göttingen, Germany
| |
Collapse
|
46
|
Pesch YY, Riedel D, Behr M. Obstructor A organizes matrix assembly at the apical cell surface to promote enzymatic cuticle maturation in Drosophila. J Biol Chem 2015; 290:10071-82. [PMID: 25737451 DOI: 10.1074/jbc.m114.614933] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2015] [Indexed: 12/29/2022] Open
Abstract
Assembly and maturation of the apical extracellular matrix (aECM) is crucial for protecting organisms, but underlying molecular mechanisms remain poorly understood. Epidermal cells secrete proteins and enzymes that assemble at the apical cell surface to provide epithelial integrity and stability during developmental growth and upon tissue damage. We analyzed molecular mechanisms of aECM assembly and identified the conserved chitin-binding protein Obst-A (Obstructor A) as an essential regulator. We show in Drosophila that Obst-A is required to coordinate protein and chitin matrix packaging at the apical cell surface during development. Secreted by epidermal cells, the Obst-A protein is specifically enriched in the apical assembly zone where matrix components are packaged into their highly ordered architecture. In obst-A null mutant larvae, the assembly zone is strongly diminished, resulting in severe disturbance of matrix scaffold organization and impaired aECM integrity. Furthermore, enzymes that support aECM stability are mislocalized. As a biological consequence, cuticle architecture, integrity, and function are disturbed in obst-A mutants, finally resulting in immediate lethality upon wounding. Our studies identify a new core organizing center, the assembly zone that controls aECM assembly at the apical cell surface. We propose a genetically conserved molecular mechanism by which Obst-A forms a matrix scaffold to coordinate trafficking and localization of proteins and enzymes in the newly deposited aECM. This mechanism is essential for maturation and stabilization of the aECM in a growing and remodeling epithelial tissue as an outermost barrier.
Collapse
Affiliation(s)
- Yanina-Yasmin Pesch
- From the Department of Molecular Developmental Biology, Life & Medical Sciences Institute (LIMES), University of Bonn, 53115 Bonn, Germany, the Department of Cell & Developmental Biology, Translational Centre for Regenerative Medicine (TRM), University of Leipzig, 04103 Leipzig, Germany, and
| | - Dietmar Riedel
- the Electron Microscopy Group, Max-Planck-Institute for Biophysical Chemistry, 37077 Göttingen, Germany
| | - Matthias Behr
- From the Department of Molecular Developmental Biology, Life & Medical Sciences Institute (LIMES), University of Bonn, 53115 Bonn, Germany, the Department of Cell & Developmental Biology, Translational Centre for Regenerative Medicine (TRM), University of Leipzig, 04103 Leipzig, Germany, and
| |
Collapse
|
47
|
Binotti B, Pavlos NJ, Riedel D, Wenzel D, Vorbrüggen G, Schalk AM, Kühnel K, Boyken J, Erck C, Martens H, Chua JJE, Jahn R. The GTPase Rab26 links synaptic vesicles to the autophagy pathway. eLife 2015; 4:e05597. [PMID: 25643395 PMCID: PMC4337689 DOI: 10.7554/elife.05597] [Citation(s) in RCA: 127] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2014] [Accepted: 02/01/2015] [Indexed: 12/27/2022] Open
Abstract
Small GTPases of the Rab family not only regulate target recognition in membrane traffic but also control other cellular functions such as cytoskeletal transport and autophagy. Here we show that Rab26 is specifically associated with clusters of synaptic vesicles in neurites. Overexpression of active but not of GDP-preferring Rab26 enhances vesicle clustering, which is particularly conspicuous for the EGFP-tagged variant, resulting in a massive accumulation of synaptic vesicles in neuronal somata without altering the distribution of other organelles. Both endogenous and induced clusters co-localize with autophagy-related proteins such as Atg16L1, LC3B and Rab33B but not with other organelles. Furthermore, Atg16L1 appears to be a direct effector of Rab26 and binds Rab26 in its GTP-bound form, albeit only with low affinity. We propose that Rab26 selectively directs synaptic and secretory vesicles into preautophagosomal structures, suggesting the presence of a novel pathway for degradation of synaptic vesicles. DOI:http://dx.doi.org/10.7554/eLife.05597.001 Our brain contains billions of cells called neurons that form an extensive network through which information is readily exchanged. These cells connect to each other via junctions called synapses. Our developing brain starts off with far more synapses than it needs, but the excess synapses are destroyed as the brain matures. Even in adults, synapses are continuously made and destroyed in response to experiences and learning. Inside neurons there are tiny bubble-like compartments called vesicles that supply the synapses with many of the proteins and other components that they need. There is a growing body of evidence that suggests these vesicles are rapidly destroyed once a synapse is earmarked for destruction, but it is not clear how this may occur. Here, Binotti, Pavlos et al. found that a protein called Rab26 sits on the surface of the vesicles near synapses. This protein promotes the formation of clusters of vesicles, and a membrane sometimes surrounds these clusters. Further experiments indicate that several proteins involved in a process called autophagy—where unwanted proteins and debris are destroyed—may also be found around the clusters of vesicles. Autophagy starts with the formation of a membrane around the material that needs to be destroyed. This seals the material off from rest of the cell so that enzymes can safely break it down. Binotti, Pavlos et al. found that one of the autophagy proteins—called Atg16L—can bind directly to Rab26, but only when Rab26 is in an ‘active’ state. These findings suggest that excess vesicles at synapses may be destroyed by autophagy. Further work will be required to establish how this process is controlled and how it is involved in the loss of synapses. DOI:http://dx.doi.org/10.7554/eLife.05597.002
Collapse
Affiliation(s)
- Beyenech Binotti
- Department of Neurobiology, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Nathan J Pavlos
- School of Surgery, University of Western Australia, Crawley, Australia
| | - Dietmar Riedel
- Facility for Transmission Electron Microscopy, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Dirk Wenzel
- Facility for Transmission Electron Microscopy, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Gerd Vorbrüggen
- Research Group Molecular Cell Dynamics, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Amanda M Schalk
- Department of Neurobiology, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Karin Kühnel
- Department of Neurobiology, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Janina Boyken
- Department of Neurobiology, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | | | | | - John J E Chua
- Department of Neurobiology, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Reinhard Jahn
- Department of Neurobiology, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| |
Collapse
|
48
|
Engelman A, Kumar S, Hussain A, Riedel D, Kwok Y. The Efficacy and Toxicity Outcomes of HIV-Infected Patients With Prostate Cancer Treated With Definitive Radiation Therapy. Int J Radiat Oncol Biol Phys 2014. [DOI: 10.1016/j.ijrobp.2014.05.1417] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
49
|
Kanagaraj P, Gautier-Stein A, Riedel D, Schomburg C, Cerdà J, Vollack N, Dosch R. Souffle/Spastizin controls secretory vesicle maturation during zebrafish oogenesis. PLoS Genet 2014; 10:e1004449. [PMID: 24967841 PMCID: PMC4072560 DOI: 10.1371/journal.pgen.1004449] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2013] [Accepted: 05/02/2014] [Indexed: 12/20/2022] Open
Abstract
During oogenesis, the egg prepares for fertilization and early embryogenesis. As a consequence, vesicle transport is very active during vitellogenesis, and oocytes are an outstanding system to study regulators of membrane trafficking. Here, we combine zebrafish genetics and the oocyte model to identify the molecular lesion underlying the zebrafish souffle (suf) mutation. We demonstrate that suf encodes the homolog of the Hereditary Spastic Paraplegia (HSP) gene SPASTIZIN (SPG15). We show that in zebrafish oocytes suf mutants accumulate Rab11b-positive vesicles, but trafficking of recycling endosomes is not affected. Instead, we detect Suf/Spastizin on cortical granules, which undergo regulated secretion. We demonstrate genetically that Suf is essential for granule maturation into secretion competent dense-core vesicles describing a novel role for Suf in vesicle maturation. Interestingly, in suf mutants immature, secretory precursors accumulate, because they fail to pinch-off Clathrin-coated buds. Moreover, pharmacological inhibition of the abscission regulator Dynamin leads to an accumulation of immature secretory granules and mimics the suf phenotype. Our results identify a novel regulator of secretory vesicle formation in the zebrafish oocyte. In addition, we describe an uncharacterized cellular mechanism for Suf/Spastizin activity during secretion, which raises the possibility of novel therapeutic avenues for HSP research. Oocytes of egg laying animals frequently represent the biggest cell type of a species. The size of the egg is a consequence of active transport processes, e.g. the import of yolk proteins, which results in the massive storage of vesicles. In addition, secretory vesicles termed cortical granules are stored in the oocyte to be discharged right after fertilization during cortical reaction, which also occurs in mammals. Their secretion leads to chorion expansion, which prevents the lethal entry of additional sperm and protects the developing embryo against physical damage. Mutants with a defect in membrane transport are successful tools to discover genes regulating vesicle formation. We molecularly identify the disrupted gene in the recessive maternal-effect mutation souffle, which encodes a homolog of human SPASTIZIN. SPASTIZIN was previously implicated in endocytosis, but our cellular analysis of mutant oocytes connects this gene also with the regulation of cortical granule exocytosis. More precisely, we show that Suf/Spastizin is crucial for the maturation of cortical granules into secretion competent vesicles describing a novel role for this protein. Since SPASITIZN causes the disease Hereditary Spastic Paraplegia in humans, our results will help to decipher the pathogenesis of this neurodegenerative disorder.
Collapse
Affiliation(s)
- Palsamy Kanagaraj
- Institut fuer Entwicklungsbiochemie, Georg-August Universitaet Goettingen, Goettingen, Germany
| | | | - Dietmar Riedel
- Max-Planck Institut fuer Biophysikalische Chemie, Goettingen, Germany
| | - Christoph Schomburg
- Institut fuer Entwicklungsbiochemie, Georg-August Universitaet Goettingen, Goettingen, Germany
| | - Joan Cerdà
- IRTA-Institute of Marine Sciences, CSIC, Barcelona, Spain
| | - Nadine Vollack
- Institut fuer Entwicklungsbiochemie, Georg-August Universitaet Goettingen, Goettingen, Germany
| | - Roland Dosch
- Institut fuer Entwicklungsbiochemie, Georg-August Universitaet Goettingen, Goettingen, Germany
- Departement de Zoologie et Biologie Animale, Universite de Geneve, Geneva, Switzerland
- * E-mail:
| |
Collapse
|
50
|
Park Y, Vennekate W, Yavuz H, Preobraschenski J, Hernandez JM, Riedel D, Walla PJ, Jahn R. α-SNAP interferes with the zippering of the SNARE protein membrane fusion machinery. J Biol Chem 2014; 289:16326-35. [PMID: 24778182 DOI: 10.1074/jbc.m114.556803] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Neuronal exocytosis is mediated by soluble N-ethylmaleimide-sensitive factor attachment protein receptor (SNARE) proteins. Before fusion, SNARE proteins form complexes bridging the membrane followed by assembly toward the C-terminal membrane anchors, thus initiating membrane fusion. After fusion, the SNARE complex is disassembled by the AAA-ATPase N-ethylmaleimide-sensitive factor that requires the cofactor α-SNAP to first bind to the assembled SNARE complex. Using chromaffin granules and liposomes we now show that α-SNAP on its own interferes with the zippering of membrane-anchored SNARE complexes midway through the zippering reaction, arresting SNAREs in a partially assembled trans-complex and preventing fusion. Intriguingly, the interference does not result in an inhibitory effect on synaptic vesicles, suggesting that membrane properties also influence the final outcome of α-SNAP interference with SNARE zippering. We suggest that binding of α-SNAP to the SNARE complex affects the ability of the SNARE complex to harness energy or transmit force to the membrane.
Collapse
Affiliation(s)
| | - Wensi Vennekate
- From the Department of Neurobiology, the AG Biomolecular Spectroscopy and Single-Molecule Detection, and
| | | | | | | | - Dietmar Riedel
- the Facility for Electron Microscopy, Max-Planck-Institute for Biophysical Chemistry, 37077 Göttingen and
| | - Peter Jomo Walla
- the AG Biomolecular Spectroscopy and Single-Molecule Detection, and the Department of Biophysical Chemistry, Institute for Physical and Theoretical Chemistry, Technical University of Braunschweig, 38106 Braunschweig, Germany
| | | |
Collapse
|