1
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Campelo F, Lillo JV, von Blume J. Protein Condensates in the Secretory Pathway: Deciphering Biophysical Interactions and Functional Significance. Biophys J 2024:S0006-3495(24)00311-4. [PMID: 38698644 DOI: 10.1016/j.bpj.2024.04.031] [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: 01/19/2024] [Revised: 03/23/2024] [Accepted: 04/30/2024] [Indexed: 05/05/2024] Open
Abstract
The emergence of phase separation phenomena among macromolecules has identified biomolecular condensates as fundamental cellular organizers. These condensates concentrate specific components and accelerate biochemical reactions without relying on membrane boundaries. While extensive studies have revealed a large variety of nuclear and cytosolic membraneless organelles, we are witnessing a surge in the exploration of protein condensates associated with the membranes of the secretory pathway, such as the endoplasmic reticulum (ER) and the Golgi apparatus. This Review focuses on protein condensates in the secretory pathway and discusses their impact on the organization and functions of this cellular process. Moreover, we explore the modes of condensate-membrane association and the biophysical and cellular consequences of protein condensate interactions with secretory pathway membranes.
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Affiliation(s)
- Felix Campelo
- ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, 08860, Castelldefels, Barcelona, Spain.
| | - Javier Vera Lillo
- ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, 08860, Castelldefels, Barcelona, Spain
| | - Julia von Blume
- Department of Cell Biology, Yale University School of Medicine, New Haven, CT, USA.
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2
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Ramazanov BR, Parchure A, Di Martino R, Kumar A, Chung M, Kim Y, Griesbeck O, Schwartz MA, Luini A, von Blume J. Calcium flow at ER-TGN contact sites facilitates secretory cargo export. Mol Biol Cell 2024; 35:ar50. [PMID: 38294859 PMCID: PMC11064664 DOI: 10.1091/mbc.e23-03-0099] [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: 05/01/2023] [Revised: 01/19/2024] [Accepted: 01/24/2024] [Indexed: 02/01/2024] Open
Abstract
Ca2+ influx into the trans-Golgi Network (TGN) promotes secretory cargo sorting by the Ca2+-ATPase SPCA1 and the luminal Ca2+ binding protein Cab45. Cab45 oligomerizes upon local Ca2+ influx, and Cab45 oligomers sequester and separate soluble secretory cargo from the bulk flow of proteins in the TGN. However, how this Ca2+ flux into the lumen of the TGN is achieved remains mysterious, as the cytosol has a nanomolar steady-state Ca2+ concentration. The TGN forms membrane contact sites (MCS) with the Endoplasmic Reticulum (ER), allowing protein-mediated exchange of molecular species such as lipids. Here, we show that the TGN export of secretory proteins requires the integrity of ER-TGN MCS and inositol 3 phosphate receptor (IP3R)-dependent Ca2+ fluxes in the MCS, suggesting Ca2+ transfer between these organelles. Using an MCS-targeted Ca2+ FRET sensor module, we measure the Ca2+ flow in these sites in real time. These data show that ER-TGN MCS facilitates the Ca2+ transfer required for Ca2+-dependent cargo sorting and export from the TGN, thus solving a fundamental question in cell biology.
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Affiliation(s)
- Bulat R. Ramazanov
- Department of Cell Biology, Yale University School of Medicine, New Haven, CT 06510
| | - Anup Parchure
- Department of Cell Biology, Yale University School of Medicine, New Haven, CT 06510
| | - Rosaria Di Martino
- Institute of Biochemistry and Cell Biology, National Research Council, Naples 80131, Italy
| | - Abhishek Kumar
- Yale Cardiovascular Research Center, Yale University School of Medicine, New Haven, CT 06510
| | - Minhwan Chung
- Yale Cardiovascular Research Center, Yale University School of Medicine, New Haven, CT 06510
| | - Yeongho Kim
- Department of Cell Biology, Yale University School of Medicine, New Haven, CT 06510
| | - Oliver Griesbeck
- Max Planck Institute of Neurobiology, Martinsried 82152, Germany
| | - Martin A. Schwartz
- Department of Cell Biology, Yale University School of Medicine, New Haven, CT 06510
- Yale Cardiovascular Research Center, Yale University School of Medicine, New Haven, CT 06510
- Department of Biomedical Engineering, Yale University, New Haven, CT 06511
| | - Alberto Luini
- Institute of Biochemistry and Cell Biology, National Research Council, Naples 80131, Italy
| | - Julia von Blume
- Department of Cell Biology, Yale University School of Medicine, New Haven, CT 06510
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3
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Campelo F, Tian M, von Blume J. Rediscovering the intricacies of secretory granule biogenesis. Curr Opin Cell Biol 2023; 85:102231. [PMID: 37657367 DOI: 10.1016/j.ceb.2023.102231] [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: 06/16/2023] [Revised: 08/01/2023] [Accepted: 08/07/2023] [Indexed: 09/03/2023]
Abstract
Regulated secretion, an essential cellular process, relies on secretory granules (SGs) for the controlled release of a diverse range of cargo molecules, including proteins, peptides, hormones, enzymes, and neurotransmitters. SG biogenesis encompasses cargo selection, sorting, packaging, and trafficking, with the trans-Golgi Network (TGN) playing a central role. Research in the last three decades has revealed significant components required for SG biogenesis; however, no cargo receptor transferring granule cargo from the TGN to immature SGs (ISGs) has yet been identified. Consequently, recent research has devoted significant attention to studying receptor-independent cargo sorting mechanisms, shedding new light on the complexities of regulated secretion. Understanding the underlying molecular and biophysical mechanisms behind cargo sorting into ISGs holds great promise for advancing our knowledge of cellular communication and disease mechanisms.
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Affiliation(s)
- Felix Campelo
- ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, 08860, Castelldefels, Barcelona, Spain
| | - Meng Tian
- Department of Cell Biology, Yale University School of Medicine, New Haven, CT, USA
| | - Julia von Blume
- Department of Cell Biology, Yale University School of Medicine, New Haven, CT, USA.
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4
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Abstract
A receptor protein called TGN46 has an important role in sorting secretory proteins into vesicles going to different destinations inside cells.
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Affiliation(s)
- Anup Parchure
- Department of Cell Biology, Yale University School of MedicineNew HavenUnited States
| | - Julia von Blume
- Department of Cell Biology, Yale University School of MedicineNew HavenUnited States
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5
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Tran ML, Kim Y, von Blume J. Quantification of Protein Exit at the Trans-Golgi Network. Methods Mol Biol 2023; 2557:583-594. [PMID: 36512239 DOI: 10.1007/978-1-0716-2639-9_35] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
With one-third of all newly synthesized proteins entering the secretory pathway, correct protein sorting is essential for cellular homeostasis. In the last three decades, researchers have developed numerous biochemical, genetic, and cell biological approaches to study protein export and sorting from the trans-Golgi network (TGN). However, accurately quantifying protein transport from one compartment to the next in the secretory pathway has been challenging. The Retention Using Selective Hooks (RUSH) system is a method that allows monitoring trafficking of a protein of interest in real time, similar to a pulse-chase experiment but without the need of radiolabeling. Accurate calculations, however, are necessary and currently lacking. Here, we combine the RUSH system with live cell imaging to quantify and calculate half lives. We exemplify our approach using a soluble secreted protein (LyzC). This system will benefit membrane trafficking researchers by adding numbers to protein export and comparing the export kinetics of different cargoes and variating conditions.
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Affiliation(s)
- Mai Ly Tran
- Department of Cell Biology, Yale University School of Medicine, New Haven, CT, USA
| | - Yeongho Kim
- Department of Cell Biology, Yale University School of Medicine, New Haven, CT, USA
| | - Julia von Blume
- Department of Cell Biology, Yale University School of Medicine, New Haven, CT, USA.
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6
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Tran ML, Tüshaus J, Kim Y, Ramazanov BR, Devireddy S, Lichtenthaler SF, Ferguson SM, von Blume J. Cab45 deficiency leads to the mistargeting of progranulin and prosaposin and aberrant lysosomal positioning. Traffic 2023; 24:4-19. [PMID: 36398980 PMCID: PMC9825660 DOI: 10.1111/tra.12873] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Revised: 10/23/2022] [Accepted: 11/09/2022] [Indexed: 11/21/2022]
Abstract
The trans-Golgi Network (TGN) sorts molecular "addresses" and sends newly synthesized proteins to their destination via vesicular transport carriers. Despite the functional significance of packaging processes at the TGN, the sorting of soluble proteins remains poorly understood. Recent research has shown that the Golgi resident protein Cab45 is a significant regulator of secretory cargo sorting at the TGN. Cab45 oligomerizes upon transient Ca2+ influx, recruits soluble cargo molecules (clients), and packs them in sphingomyelin-rich transport carriers. However, the identity of client molecules packed into Cab45 vesicles is scarce. Therefore, we used a precise and highly efficient secretome analysis technology called hiSPECs. Intriguingly, we observed that Cab45 deficient cells manifest hypersecretion of lysosomal hydrolases. Specifically, Cab45 deficient cells secrete the unprocessed precursors of prosaposin (PSAP) and progranulin (PGRN). In addition, lysosomes in these cells show an aberrant perinuclear accumulation suggesting a new role of Cab45 in lysosomal positioning. This work uncovers a yet unknown function of Cab45 in regulating lysosomal function.
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Affiliation(s)
- Mai Ly Tran
- Department of Cell Biology, Yale University School of Medicine, New Haven, CT, USA
| | - Johanna Tüshaus
- German Center for Neurodegenerative Diseases (DZNE), Munich, Germany
- Neuroproteomics, School of Medicine, Klinikum Rechts der Isar, Technical University of Munich, 81675
| | - Yeongho Kim
- Department of Cell Biology, Yale University School of Medicine, New Haven, CT, USA
| | - Bulat R. Ramazanov
- Department of Cell Biology, Yale University School of Medicine, New Haven, CT, USA
| | - Swathi Devireddy
- Department of Cell Biology, Yale University School of Medicine, New Haven, CT, USA
- Department of Neuroscience, Yale University School of Medicine, New Haven, CT, USA
- Program in Cellular Neuroscience, Neurodegeneration and Repair, Yale University School of Medicine, New Haven, CT, USA
- Wu Tsai Institute, Yale University, New Haven, CT, USA
| | - Stefan F. Lichtenthaler
- German Center for Neurodegenerative Diseases (DZNE), Munich, Germany
- Neuroproteomics, School of Medicine, Klinikum Rechts der Isar, Technical University of Munich, 81675
- Munich Cluster for Systems Neurology (SyNergy), Munich, Germany
| | - Shawn M. Ferguson
- Department of Cell Biology, Yale University School of Medicine, New Haven, CT, USA
- Department of Neuroscience, Yale University School of Medicine, New Haven, CT, USA
- Program in Cellular Neuroscience, Neurodegeneration and Repair, Yale University School of Medicine, New Haven, CT, USA
- Wu Tsai Institute, Yale University, New Haven, CT, USA
| | - Julia von Blume
- Department of Cell Biology, Yale University School of Medicine, New Haven, CT, USA
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7
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Parchure A, Tian M, Stalder D, Boyer CK, Bearrows SC, Rohli KE, Zhang J, Rivera-Molina F, Ramazanov BR, Mahata SK, Wang Y, Stephens SB, Gershlick DC, von Blume J. Liquid-liquid phase separation facilitates the biogenesis of secretory storage granules. J Cell Biol 2022; 221:e202206132. [PMID: 36173346 PMCID: PMC9526250 DOI: 10.1083/jcb.202206132] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [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: 06/27/2022] [Revised: 08/30/2022] [Accepted: 09/01/2022] [Indexed: 02/03/2023] Open
Abstract
Insulin is synthesized by pancreatic β-cells and stored into secretory granules (SGs). SGs fuse with the plasma membrane in response to a stimulus and deliver insulin to the bloodstream. The mechanism of how proinsulin and its processing enzymes are sorted and targeted from the trans-Golgi network (TGN) to SGs remains mysterious. No cargo receptor for proinsulin has been identified. Here, we show that chromogranin (CG) proteins undergo liquid-liquid phase separation (LLPS) at a mildly acidic pH in the lumen of the TGN, and recruit clients like proinsulin to the condensates. Client selectivity is sequence-independent but based on the concentration of the client molecules in the TGN. We propose that the TGN provides the milieu for converting CGs into a "cargo sponge" leading to partitioning of client molecules, thus facilitating receptor-independent client sorting. These findings provide a new receptor-independent sorting model in β-cells and many other cell types and therefore represent an innovation in the field of membrane trafficking.
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Affiliation(s)
- Anup Parchure
- Department of Cell Biology, Yale University School of Medicine, New Haven, CT
| | - Meng Tian
- Department of Cell Biology, Yale University School of Medicine, New Haven, CT
| | - Danièle Stalder
- Cambridge Institute for Medical Research, University of Cambridge, Cambridge, UK
| | - Cierra K. Boyer
- Departments of Pharmacology and Neuroscience, Fraternal Order of Eagles Diabetes Research Center, University of Iowa, Iowa City, IA
- Internal Medicine, Division of Endocrinology and Metabolism, University of Iowa, Iowa City, IA
| | - Shelby C. Bearrows
- Departments of Pharmacology and Neuroscience, Fraternal Order of Eagles Diabetes Research Center, University of Iowa, Iowa City, IA
- Internal Medicine, Division of Endocrinology and Metabolism, University of Iowa, Iowa City, IA
| | - Kristen E. Rohli
- Departments of Pharmacology and Neuroscience, Fraternal Order of Eagles Diabetes Research Center, University of Iowa, Iowa City, IA
- Internal Medicine, Division of Endocrinology and Metabolism, University of Iowa, Iowa City, IA
| | - Jianchao Zhang
- Department of Molecular, Cellular and Developmental Biology, University of Michigan, Ann Arbor, MI
- Department of Neurology, University of Michigan School of Medicine, Ann Arbor, MI
| | - Felix Rivera-Molina
- Department of Cell Biology, Yale University School of Medicine, New Haven, CT
| | - Bulat R. Ramazanov
- Department of Cell Biology, Yale University School of Medicine, New Haven, CT
| | - Sushil K. Mahata
- Department of Medicine, University of California San Diego, La Jolla, CA
- VA San Diego Healthcare System, San Diego, CA
| | - Yanzhuang Wang
- Department of Molecular, Cellular and Developmental Biology, University of Michigan, Ann Arbor, MI
- Department of Neurology, University of Michigan School of Medicine, Ann Arbor, MI
| | - Samuel B. Stephens
- Departments of Pharmacology and Neuroscience, Fraternal Order of Eagles Diabetes Research Center, University of Iowa, Iowa City, IA
| | - David C. Gershlick
- Cambridge Institute for Medical Research, University of Cambridge, Cambridge, UK
| | - Julia von Blume
- Department of Cell Biology, Yale University School of Medicine, New Haven, CT
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8
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Abstract
The Golgi functions principally in the biogenesis and trafficking of glycoproteins and lipids. It is compartmentalized into multiple flattened adherent membrane sacs termed cisternae, which each contain a distinct repertoire of resident proteins, principally enzymes that modify newly synthesized proteins and lipids sequentially as they traffic through the stack of Golgi cisternae. Upon reaching the final compartments of the Golgi, the trans cisterna and trans-Golgi network (TGN), processed glycoproteins and lipids are packaged into coated and non-coated transport carriers derived from the trans Golgi and TGN. The cargoes of clathrin-coated vesicles are chiefly residents of endo-lysosomal organelles, while uncoated carriers ferry cargo to the cell surface. There are outstanding questions regarding the mechanisms of protein and lipid sorting within the Golgi for export to different organelles. Nonetheless, conceptual advances have begun to define the key molecular features of cargo clients and the mechanisms underlying their sorting into distinct export pathways, which we have collated in this Cell Science at a Glance article and the accompanying poster.
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Affiliation(s)
| | | | - Julia von Blume
- Department of Cell Biology, Yale School of Medicine, Yale University, New Haven, CT 06520, USA
| | - Christopher G. Burd
- Department of Cell Biology, Yale School of Medicine, Yale University, New Haven, CT 06520, USA
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9
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Abstract
The sorting of secreted cargo proteins and their export from the trans-Golgi network (TGN) remains an enigma in the field of membrane trafficking; although the sorting mechanisms of many transmembrane proteins have been well described. The sorting of secreted proteins at the TGN is crucial for the release of signaling factors, as well as extracellular matrix proteins. These proteins are required for cell-cell communication and integrity of an organism. Missecretion of these factors can cause diseases such as neurological disorders, autoimmune disease, or cancer. The major open question is how soluble proteins that are not associated with the membrane are packed into TGN derived transport carriers to facilitate their transport to the plasma membrane. Recent investigations have identified novel types of protein and lipid machinery that facilitate the packing of these molecules into a TGN derived vesicle. In addition, novel research has uncovered an exciting link between cargo sorting and export in which TGN structure and dynamics, as well as TGN/endoplasmic reticulum contact sites, play a significant role. Here, we have reviewed the progress made in our understanding of these processes.
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Affiliation(s)
- Bulat R Ramazanov
- Department of Cell Biology, Yale University School of Medicine, New Haven, CT, USA
| | - Mai Ly Tran
- Department of Cell Biology, Yale University School of Medicine, New Haven, CT, USA
| | - Julia von Blume
- Department of Cell Biology, Yale University School of Medicine, New Haven, CT, USA.
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10
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Pacheco-Fernandez N, Pakdel M, Blank B, Sanchez-Gonzalez I, Weber K, Tran ML, Hecht TKH, Gautsch R, Beck G, Perez F, Hausser A, Linder S, von Blume J. Nucleobindin-1 regulates ECM degradation by promoting intra-Golgi trafficking of MMPs. J Cell Biol 2021; 219:151825. [PMID: 32479594 PMCID: PMC7401813 DOI: 10.1083/jcb.201907058] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [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: 07/09/2019] [Revised: 12/29/2019] [Accepted: 05/04/2020] [Indexed: 12/14/2022] Open
Abstract
Matrix metalloproteinases (MMPs) degrade several ECM components and are crucial modulators of cell invasion and tissue organization. Although much has been reported about their function in remodeling ECM in health and disease, their trafficking across the Golgi apparatus remains poorly understood. Here we report that the cis-Golgi protein nucleobindin-1 (NUCB1) is critical for MMP2 and MT1-MMP trafficking along the Golgi apparatus. This process is Ca2+-dependent and is required for invasive MDA-MB-231 cell migration as well as for gelatin degradation in primary human macrophages. Our findings emphasize the importance of NUCB1 as an essential component of MMP transport and its overall impact on ECM remodeling.
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Affiliation(s)
| | | | - Birgit Blank
- Department of Cell Biology, Yale University School of Medicine, New Haven, CT
| | | | - Kathrin Weber
- Institut für Medizinische Mikrobiologie, Virologie und Hygiene, Universitätsklinikum Hamburg, Hamburg, Germany
| | - Mai Ly Tran
- Max Planck Institute of Biochemistry, Martinsried, Germany.,Department of Cell Biology, Yale University School of Medicine, New Haven, CT
| | - Tobias Karl-Heinz Hecht
- Max Planck Institute of Biochemistry, Martinsried, Germany.,Department of Cell Biology, Yale University School of Medicine, New Haven, CT
| | - Renate Gautsch
- Max Planck Institute of Biochemistry, Martinsried, Germany
| | - Gisela Beck
- Max Planck Institute of Biochemistry, Martinsried, Germany
| | - Franck Perez
- Institute Curie, PSL Research University, Centre National de la Recherche Scientifique, UMR 144, Paris, France
| | - Angelika Hausser
- Institute of Cell Biology and Immunology, University of Stuttgart, Stuttgart, Germany
| | - Stefan Linder
- Institut für Medizinische Mikrobiologie, Virologie und Hygiene, Universitätsklinikum Hamburg, Hamburg, Germany
| | - Julia von Blume
- Max Planck Institute of Biochemistry, Martinsried, Germany.,Department of Cell Biology, Yale University School of Medicine, New Haven, CT
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11
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Pakdel M, Pacheco-Fernandez N, von Blume J. Retention Using Selective Hooks (RUSH) Cargo Sorting Assay for Live-cell Vesicle Tracking in the Secretory Pathway Using HeLa Cells. Bio Protoc 2021; 11:e3958. [PMID: 33855118 DOI: 10.21769/bioprotoc.3958] [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: 09/23/2020] [Revised: 01/14/2021] [Accepted: 01/21/2021] [Indexed: 11/02/2022] Open
Abstract
More than 30% of the total amount of proteins synthesized in mammalian cells follow the secretory pathway in order to mature and be properly sorted to their final destinations. Among several methodologies that describe live-cell monitoring of vesicles, the Retention Using Selective Hooks (RUSH) system is a powerful one that allows to visualize cargo trafficking under physiological conditions. The present protocol describes a method to use the RUSH system in live-cell microscopy and a subsequent quantitative analysis of cargo vesicles to dissect protein trafficking. In brief, HeLa cells are transiently transfected with an MMP2-RUSH construct and vesicle trafficking is evaluated by wide-field microscopy, recording videos in 1-min time frames for 45 min. We also present a quantitative approach that can be used to identify kinetics of uncharacterized protein cargo, as well as to evaluate with more detail processes such as ER-to-Golgi vesicle trafficking. Graphic abstract: Live-cell RUSH: a tool to monitor real-time protein trafficking in the secretory pathway.
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Affiliation(s)
- Mehrshad Pakdel
- Department of Molecular Medicine, Max-Planck Institute of Biochemistry, Martinsried, Germany
| | | | - Julia von Blume
- Department of Cell Biology, Yale University, New Haven (CN), USA
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12
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Hecht TKH, Blank B, Steger M, Lopez V, Beck G, Ramazanov B, Mann M, Tagliabracci V, von Blume J. Fam20C regulates protein secretion by Cab45 phosphorylation. J Cell Biol 2020; 219:e201910089. [PMID: 32422653 PMCID: PMC7265331 DOI: 10.1083/jcb.201910089] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [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: 10/14/2019] [Revised: 03/06/2020] [Accepted: 04/02/2020] [Indexed: 12/18/2022] Open
Abstract
The TGN is a key compartment for the sorting and secretion of newly synthesized proteins. At the TGN, soluble proteins are sorted based on the instructions carried in their oligosaccharide backbones or by a Ca2+-mediated process that involves the cargo-sorting protein Cab45. Here, we show that Cab45 is phosphorylated by the Golgi-specific protein kinase Fam20C. Mimicking of phosphorylation translocates Cab45 into TGN-derived vesicles, which goes along with an increased export of LyzC, a Cab45 client. Our findings demonstrate that Fam20C plays a key role in the export of Cab45 clients by fine-tuning Cab45 oligomerization and thus impacts Cab45 retention in the TGN.
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Affiliation(s)
- Tobias Karl-Heinz Hecht
- Department of Cell Biology, Yale University School of Medicine, New Haven, CT
- Max Planck Institute of Biochemistry, Department of Molecular Medicine, Martinsried, Germany
| | - Birgit Blank
- Department of Cell Biology, Yale University School of Medicine, New Haven, CT
- Max Planck Institute of Biochemistry, Department of Molecular Medicine, Martinsried, Germany
| | - Martin Steger
- Max Planck Institute of Biochemistry, Department of Molecular Medicine, Martinsried, Germany
| | - Victor Lopez
- Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, TX
| | - Gisela Beck
- Max Planck Institute of Biochemistry, Department of Molecular Medicine, Martinsried, Germany
| | - Bulat Ramazanov
- Department of Cell Biology, Yale University School of Medicine, New Haven, CT
| | - Matthias Mann
- Max Planck Institute of Biochemistry, Department of Molecular Medicine, Martinsried, Germany
| | - Vincent Tagliabracci
- Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, TX
| | - Julia von Blume
- Department of Cell Biology, Yale University School of Medicine, New Haven, CT
- Max Planck Institute of Biochemistry, Department of Molecular Medicine, Martinsried, Germany
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13
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von Blume J, Hausser A. Lipid-dependent coupling of secretory cargo sorting and trafficking at the trans-Golgi network. FEBS Lett 2019; 593:2412-2427. [PMID: 31344259 PMCID: PMC8048779 DOI: 10.1002/1873-3468.13552] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [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: 05/20/2019] [Revised: 07/10/2019] [Accepted: 07/22/2019] [Indexed: 12/17/2022]
Abstract
In eukaryotic cells, the trans-Golgi network (TGN) serves as a platform for secretory cargo sorting and trafficking. In recent years, it has become evident that a complex network of lipid–lipid and lipid–protein interactions contributes to these key functions. This review addresses the role of lipids at the TGN with a particular emphasis on sphingolipids and diacylglycerol. We further highlight how these lipids couple secretory cargo sorting and trafficking for spatiotemporal coordination of protein transport to the plasma membrane.
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Affiliation(s)
- Julia von Blume
- Department of Cell Biology, Yale School of Medicine, New Haven, CT, USA.,Max Planck Institute of Biochemistry, Martinsried, Germany
| | - Angelika Hausser
- Institute of Cell Biology and Immunology, University of Stuttgart, Germany.,Stuttgart Research Center Systems Biology, University of Stuttgart, Germany
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14
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Papadopoulou AA, Müller SA, Mentrup T, Shmueli MD, Niemeyer J, Haug-Kröper M, von Blume J, Mayerhofer A, Feederle R, Schröder B, Lichtenthaler SF, Fluhrer R. Signal peptide peptidase-like 2c impairs vesicular transport and cleaves SNARE proteins. EMBO Rep 2019; 20:20/5/e48133. [PMID: 31061204 DOI: 10.15252/embr.201948133] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
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15
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Silvestre-Roig C, Braster Q, Wichapong K, Lee EY, Teulon JM, Berrebeh N, Winter J, Adrover JM, Santos GS, Froese A, Lemnitzer P, Ortega-Gómez A, Chevre R, Marschner J, Schumski A, Winter C, Perez-Olivares L, Pan C, Paulin N, Schoufour T, Hartwig H, González-Ramos S, Kamp F, Megens RTA, Mowen KA, Gunzer M, Maegdefessel L, Hackeng T, Lutgens E, Daemen M, von Blume J, Anders HJ, Nikolaev VO, Pellequer JL, Weber C, Hidalgo A, Nicolaes GAF, Wong GCL, Soehnlein O. Externalized histone H4 orchestrates chronic inflammation by inducing lytic cell death. Nature 2019; 569:236-240. [PMID: 31043745 PMCID: PMC6716525 DOI: 10.1038/s41586-019-1167-6] [Citation(s) in RCA: 242] [Impact Index Per Article: 48.4] [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: 11/28/2017] [Accepted: 04/02/2019] [Indexed: 12/22/2022]
Abstract
The perpetuation of inflammation is an important pathophysiological contributor to the global medical burden. Chronic inflammation is promoted by non-programmed cell death1,2; however, how inflammation is instigated, its cellular and molecular mediators, and its therapeutic value are poorly defined. Here we use mouse models of atherosclerosis-a major underlying cause of mortality worldwide-to demonstrate that extracellular histone H4-mediated membrane lysis of smooth muscle cells (SMCs) triggers arterial tissue damage and inflammation. We show that activated lesional SMCs attract neutrophils, triggering the ejection of neutrophil extracellular traps that contain nuclear proteins. Among them, histone H4 binds to and lyses SMCs, leading to the destabilization of plaques; conversely, the neutralization of histone H4 prevents cell death of SMCs and stabilizes atherosclerotic lesions. Our data identify a form of cell death found at the core of chronic vascular disease that is instigated by leukocytes and can be targeted therapeutically.
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Affiliation(s)
- Carlos Silvestre-Roig
- Institute for Cardiovascular Prevention (IPEK), LMU München, Munich, Germany.
- Department of Pathology, AMC, Amsterdam, The Netherlands.
- German Center for Cardiovascular Research (DZHK), Partner Site Munich Heart Alliance, Munich, Germany.
| | - Quinte Braster
- Institute for Cardiovascular Prevention (IPEK), LMU München, Munich, Germany
- Department of Pathology, AMC, Amsterdam, The Netherlands
- German Center for Cardiovascular Research (DZHK), Partner Site Munich Heart Alliance, Munich, Germany
| | - Kanin Wichapong
- Department of Biochemistry, CARIM, University Maastricht, Maastricht, The Netherlands
| | - Ernest Y Lee
- Department of Bioengineering, University of California, Los Angeles, Los Angeles, CA, USA
| | | | - Nihel Berrebeh
- Université Grenoble Alpes, CEA, CNRS, IBS, Grenoble, France
| | - Janine Winter
- Institute for Cardiovascular Prevention (IPEK), LMU München, Munich, Germany
| | - José M Adrover
- Area of Developmental and Cell Biology, Fundación Centro Nacional de Investigaciones Cardiovasculares Carlos III (CNIC), Madrid, Spain
| | | | - Alexander Froese
- Institute of Experimental Cardiovascular Research, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
- German Center for Cardiovascular Research (DZHK), Partner Site Hamburg/Kiel/Lübeck, Hamburg, Germany
| | - Patricia Lemnitzer
- Institute for Cardiovascular Prevention (IPEK), LMU München, Munich, Germany
| | - Almudena Ortega-Gómez
- Institute for Cardiovascular Prevention (IPEK), LMU München, Munich, Germany
- German Center for Cardiovascular Research (DZHK), Partner Site Munich Heart Alliance, Munich, Germany
| | - Raphael Chevre
- Institute for Cardiovascular Prevention (IPEK), LMU München, Munich, Germany
| | - Julian Marschner
- Medizinische Klinik und Poliklinik IV, LMU München, Munich, Germany
| | - Ariane Schumski
- Institute for Cardiovascular Prevention (IPEK), LMU München, Munich, Germany
- German Center for Cardiovascular Research (DZHK), Partner Site Munich Heart Alliance, Munich, Germany
| | - Carla Winter
- Institute for Cardiovascular Prevention (IPEK), LMU München, Munich, Germany
- German Center for Cardiovascular Research (DZHK), Partner Site Munich Heart Alliance, Munich, Germany
| | | | - Chang Pan
- Institute for Cardiovascular Prevention (IPEK), LMU München, Munich, Germany
| | - Nicole Paulin
- Institute for Cardiovascular Prevention (IPEK), LMU München, Munich, Germany
| | - Tom Schoufour
- Department of Pathology, AMC, Amsterdam, The Netherlands
| | - Helene Hartwig
- Institute for Cardiovascular Prevention (IPEK), LMU München, Munich, Germany
- Department of Pathology, AMC, Amsterdam, The Netherlands
| | | | - Frits Kamp
- BMC, Metabolic Biochemistry, LMU München, Munich, Germany
| | - Remco T A Megens
- Institute for Cardiovascular Prevention (IPEK), LMU München, Munich, Germany
- Department of Biomedical Engineering, CARIM, University Maastricht, Maastricht, The Netherlands
| | | | - Matthias Gunzer
- Institute for Experimental Immunology and Imaging, University Hospital Essen, Essen, Germany
| | - Lars Maegdefessel
- German Center for Cardiovascular Research (DZHK), Partner Site Munich Heart Alliance, Munich, Germany
- Department of Vascular and Endovascular Surgery, Technical University Munich, Munich, Germany
- Department of Medicine Solna, Karolinska Institute, Stockholm, Sweden
| | - Tilman Hackeng
- Department of Biochemistry, CARIM, University Maastricht, Maastricht, The Netherlands
| | - Esther Lutgens
- Institute for Cardiovascular Prevention (IPEK), LMU München, Munich, Germany
- Department of Medical Biochemistry, AMC, Amsterdam, The Netherlands
| | - Mat Daemen
- Department of Pathology, AMC, Amsterdam, The Netherlands
| | | | | | - Viacheslav O Nikolaev
- Institute of Experimental Cardiovascular Research, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
- German Center for Cardiovascular Research (DZHK), Partner Site Hamburg/Kiel/Lübeck, Hamburg, Germany
| | | | - Christian Weber
- Institute for Cardiovascular Prevention (IPEK), LMU München, Munich, Germany
- German Center for Cardiovascular Research (DZHK), Partner Site Munich Heart Alliance, Munich, Germany
- Department of Biochemistry, CARIM, University Maastricht, Maastricht, The Netherlands
| | - Andrés Hidalgo
- Institute for Cardiovascular Prevention (IPEK), LMU München, Munich, Germany
- Area of Developmental and Cell Biology, Fundación Centro Nacional de Investigaciones Cardiovasculares Carlos III (CNIC), Madrid, Spain
| | - Gerry A F Nicolaes
- Department of Biochemistry, CARIM, University Maastricht, Maastricht, The Netherlands
| | - Gerard C L Wong
- Department of Bioengineering, University of California, Los Angeles, Los Angeles, CA, USA
| | - Oliver Soehnlein
- Institute for Cardiovascular Prevention (IPEK), LMU München, Munich, Germany.
- Department of Pathology, AMC, Amsterdam, The Netherlands.
- German Center for Cardiovascular Research (DZHK), Partner Site Munich Heart Alliance, Munich, Germany.
- Department of Medicine Solna, Karolinska Institute, Stockholm, Sweden.
- Department of Physiology and Pharmacology (FyFa), Karolinska Institutet, Stockholm, Sweden.
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16
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Pakdel M, von Blume J. Exploring new routes for secretory protein export from the trans-Golgi network. Mol Biol Cell 2019; 29:235-240. [PMID: 29382805 PMCID: PMC5996961 DOI: 10.1091/mbc.e17-02-0117] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [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: 09/01/2017] [Revised: 11/30/2017] [Accepted: 12/01/2017] [Indexed: 12/21/2022] Open
Abstract
Sorting of soluble proteins for transport to intracellular compartments and for secretion from cells is essential for cell and tissue homeostasis. The trans-Golgi network (TGN) is a major sorting station that sorts secretory proteins into specific carriers to transport them to their final destinations. The sorting of lysosomal hydrolases at the TGN by the mannose 6-phosphate receptor is well understood. The recent discovery of a Ca2+-based sorting of secretory cargo at the TGN is beginning to uncover the mechanism by which cells sort secretory cargoes from Golgi residents and cargoes destined to the other cellular compartments. This Ca2+-based sorting involves the cytoplasmic actin cytoskeleton, which through membrane anchored Ca2+ ATPase SPCA1 and the luminal Ca2+ binding protein Cab45 sorts of a subset of secretory proteins at the TGN. We present this discovery and highlight important challenges that remain unaddressed in the overall pathway of cargo sorting at the TGN.
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Affiliation(s)
- Mehrshad Pakdel
- Max Planck Institute of Biochemistry, 82152 Martinsried, Germany
| | - Julia von Blume
- Max Planck Institute of Biochemistry, 82152 Martinsried, Germany
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17
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Affiliation(s)
- Akihiko Nakano
- RIKEN Center for Advanced Photonics, Wako, Saitama 351-0198, Japan
| | - Julia von Blume
- Max-Planck Institute for Biochemistry, 82152 Martinsried, Germany
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18
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Papadopoulou AA, Müller SA, Mentrup T, Shmueli MD, Niemeyer J, Haug-Kröper M, von Blume J, Mayerhofer A, Feederle R, Schröder B, Lichtenthaler SF, Fluhrer R. Signal peptide peptidase-like 2c impairs vesicular transport and cleaves SNARE proteins. EMBO Rep 2019; 20:e46451. [PMID: 30733281 PMCID: PMC6399617 DOI: 10.15252/embr.201846451] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [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: 05/18/2018] [Revised: 12/07/2018] [Accepted: 12/21/2018] [Indexed: 12/25/2022] Open
Abstract
Members of the GxGD-type intramembrane aspartyl proteases have emerged as key players not only in fundamental cellular processes such as B-cell development or protein glycosylation, but also in development of pathologies, such as Alzheimer's disease or hepatitis virus infections. However, one member of this protease family, signal peptide peptidase-like 2c (SPPL2c), remains orphan and its capability of proteolysis as well as its physiological function is still enigmatic. Here, we demonstrate that SPPL2c is catalytically active and identify a variety of SPPL2c candidate substrates using proteomics. The majority of the SPPL2c candidate substrates cluster to the biological process of vesicular trafficking. Analysis of selected SNARE proteins reveals proteolytic processing by SPPL2c that impairs vesicular transport and causes retention of cargo proteins in the endoplasmic reticulum. As a consequence, the integrity of subcellular compartments, in particular the Golgi, is disturbed. Together with a strikingly high physiological SPPL2c expression in testis, our data suggest involvement of SPPL2c in acrosome formation during spermatogenesis.
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Affiliation(s)
- Alkmini A Papadopoulou
- Institute for Metabolic Biochemistry, Biomedical Center (BMC), Ludwig-Maximilians University Munich, Munich, Germany
| | - Stephan A Müller
- DZNE - German Center for Neurodegenerative Diseases, Munich, Germany
| | - Torben Mentrup
- Biochemical Institute, Christian Albrechts University of Kiel, Kiel, Germany
| | - Merav D Shmueli
- DZNE - German Center for Neurodegenerative Diseases, Munich, Germany
- Department of Immunology, The Weizmann Institute of Science, Rehovot, Israel
- Neuroproteomics, School of Medicine, Klinikum Rechts der Isar, and Institute for Advanced Study, Technical University Munich, Munich, Germany
| | - Johannes Niemeyer
- Biochemical Institute, Christian Albrechts University of Kiel, Kiel, Germany
| | - Martina Haug-Kröper
- Institute for Metabolic Biochemistry, Biomedical Center (BMC), Ludwig-Maximilians University Munich, Munich, Germany
| | | | - Artur Mayerhofer
- Cell Biology, Anatomy III, Biomedical Center (BMC), Ludwig-Maximilians University Munich, Munich, Germany
| | - Regina Feederle
- DZNE - German Center for Neurodegenerative Diseases, Munich, Germany
- Institute for Diabetes and Obesity, Monoclonal Antibody Core Facility, Helmholtz Center Munich, German Research Center for Environmental Health, Neuherberg, Germany
- Munich Center for Systems Neurology (SyNergy), Munich, Germany
| | - Bernd Schröder
- Biochemical Institute, Christian Albrechts University of Kiel, Kiel, Germany
- Institute for Physiological Chemistry, Technische Universität Dresden, Dresden, Germany
| | - Stefan F Lichtenthaler
- DZNE - German Center for Neurodegenerative Diseases, Munich, Germany
- Neuroproteomics, School of Medicine, Klinikum Rechts der Isar, and Institute for Advanced Study, Technical University Munich, Munich, Germany
- Munich Center for Systems Neurology (SyNergy), Munich, Germany
| | - Regina Fluhrer
- Institute for Metabolic Biochemistry, Biomedical Center (BMC), Ludwig-Maximilians University Munich, Munich, Germany
- DZNE - German Center for Neurodegenerative Diseases, Munich, Germany
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19
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Levine TP, Perez F, Saheki Y, von Blume J. Meeting Report from the 2019 "Organelle Zone" Symposium in Osaka, Japan. ACTA ACUST UNITED AC 2019; 2. [PMID: 31588423 DOI: 10.1177/2515256419877091] [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] [Indexed: 11/17/2022]
Abstract
On May 29 at the Osaka University Hospital, Japan, the "Organelle Zones" research grant group (see http://organellezone.org/english/) organized a one day symposium for its own members and four guest speakers, with about 60 attendees. The research group studies three different ways in which regions within organelles carry out functions distinct from other parts of the organelle. Work at this sub-organellar level is increasingly recognised as an important aspect of cell biology. The group's projects are divided into these themes with 9 Principal Investigators and 18 Co-Investigators over 5 years. The symposium, followed a similar meeting in 2018, and had 4 external speakers and 4 internal members of the consortium. The talks were divided into three sessions, each show-casing one way of sub-compartmentalising organelles into zones.
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Affiliation(s)
- Tim P Levine
- UCL Institute of Ophthalmology, London EC1V 9EL, UK
| | - Franck Perez
- Cell Biology and Cancer, Institut Curie, PSL Research University, CNRS UMR144, Paris, France
| | - Yasunori Saheki
- Lee Kong Chian School of Medicine, Nanyang Technological University, 308232, Singapore
| | - Julia von Blume
- Department of Cell Biology, Yale School of Medicine, New Haven, Connecticut 06520, USA
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20
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Deng Y, Pakdel M, Blank B, Sundberg EL, Burd CG, von Blume J. Activity of the SPCA1 Calcium Pump Couples Sphingomyelin Synthesis to Sorting of Secretory Proteins in the Trans-Golgi Network. Dev Cell 2018; 47:464-478.e8. [PMID: 30393074 DOI: 10.1016/j.devcel.2018.10.012] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [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: 05/16/2018] [Revised: 08/29/2018] [Accepted: 10/05/2018] [Indexed: 12/24/2022]
Abstract
How the principal functions of the Golgi apparatus-protein processing, lipid synthesis, and sorting of macromolecules-are integrated to constitute cargo-specific trafficking pathways originating from the trans-Golgi network (TGN) is unknown. Here, we show that the activity of the Golgi localized SPCA1 calcium pump couples sorting and export of secreted proteins to synthesis of new lipid in the TGN membrane. A secreted Ca2+-binding protein, Cab45, constitutes the core component of a Ca2+-dependent, oligomerization-driven sorting mechanism whereby secreted proteins bound to Cab45 are packaged into a TGN-derived vesicular carrier whose membrane is enriched in sphingomyelin, a lipid implicated in TGN-to-cell surface transport. SPCA1 activity is controlled by the sphingomyelin content of the TGN membrane, such that local sphingomyelin synthesis promotes Ca2+ flux into the lumen of the TGN, which drives secretory protein sorting and export, thereby establishing a protein- and lipid-specific secretion pathway.
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Affiliation(s)
- Yongqiang Deng
- Department of Cell Biology, Yale University School of Medicine, New Haven, CT, USA
| | - Mehrshad Pakdel
- Max Planck Institute of Biochemistry, Am Klopferspitz 18, 82152 Martinsried, Germany
| | - Birgit Blank
- Max Planck Institute of Biochemistry, Am Klopferspitz 18, 82152 Martinsried, Germany
| | - Emma L Sundberg
- Department of Cell Biology, Yale University School of Medicine, New Haven, CT, USA
| | - Christopher G Burd
- Department of Cell Biology, Yale University School of Medicine, New Haven, CT, USA.
| | - Julia von Blume
- Max Planck Institute of Biochemistry, Am Klopferspitz 18, 82152 Martinsried, Germany.
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21
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Blank B, von Blume J. Cab45-Unraveling key features of a novel secretory cargo sorter at the trans-Golgi network. Eur J Cell Biol 2017; 96:383-390. [PMID: 28372832 DOI: 10.1016/j.ejcb.2017.03.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [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: 12/21/2016] [Revised: 02/27/2017] [Accepted: 03/02/2017] [Indexed: 12/15/2022] Open
Abstract
The accurate and efficient delivery of proteins to specific domains of the plasma membrane or to the extracellular space is critical for the ordered function of surface receptors and proteins such as insulin, collagens, antibodies, extracellular proteases. The trans-Golgi network is responsible for sorting proteins onto specific carriers for transport to their final destination. The role of the mannose-6-phosphate receptor in the sorting of hydrolases destined for lysosomes has been studied extensively, but the sorting mechanisms for secreted proteins remains poorly understood. We recently described a novel process that links the cytoplasmic actin cytoskeleton to the membrane-anchored Ca2+ ATPase SPCA1 and the lumenal Ca2+-binding protein Cab45, which mediates sorting of a subset of secretory proteins at the TGN. In response to Ca2+ influx, Cab45 forms oligomers, enabling it to bind a variety of specific cargo molecules. Thus, we suggest that this represents a novel way to export cargo molecules without the need for a bona fide transmembrane cargo receptor. This review focuses on Cab45's molecular function and highlights its possible role in disease.
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Affiliation(s)
- Birgit Blank
- Max Planck Institute of Biochemistry, Am Klopferspitz 18, 82152 Martinsried, Germany
| | - Julia von Blume
- Max Planck Institute of Biochemistry, Am Klopferspitz 18, 82152 Martinsried, Germany.
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22
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Crevenna AH, Blank B, Maiser A, Emin D, Prescher J, Beck G, Kienzle C, Bartnik K, Habermann B, Pakdel M, Leonhardt H, Lamb DC, von Blume J. Secretory cargo sorting by Ca2+-dependent Cab45 oligomerization at the trans-Golgi network. J Cell Biol 2016; 213:305-14. [PMID: 27138253 PMCID: PMC4862333 DOI: 10.1083/jcb.201601089] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [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: 01/25/2016] [Accepted: 04/06/2016] [Indexed: 11/22/2022] Open
Abstract
Crevenna et al. examine the mechanism by which secretory cargoes are segregated at the trans-Golgi network (TGN) for release into the extracellular space. The authors demonstrate that Ca2+-dependent changes in Cab45 oligomerization mediate sorting of specific cargo molecules at the TGN. Sorting and export of transmembrane cargoes and lysosomal hydrolases at the trans-Golgi network (TGN) are well understood. However, elucidation of the mechanism by which secretory cargoes are segregated for their release into the extracellular space remains a challenge. We have previously demonstrated that, in a reaction that requires Ca2+, the soluble TGN-resident protein Cab45 is necessary for the sorting of secretory cargoes at the TGN. Here, we report that Cab45 reversibly assembles into oligomers in the presence of Ca2+. These Cab45 oligomers specifically bind secretory proteins, such as COMP and LyzC, in a Ca2+-dependent manner in vitro. In intact cells, mutation of the Ca2+-binding sites in Cab45 impairs oligomerization, as well as COMP and LyzC sorting. Superresolution microscopy revealed that Cab45 colocalizes with secretory proteins and the TGN Ca2+ pump (SPCA1) in specific TGN microdomains. These findings reveal that Ca2+-dependent changes in Cab45 mediate sorting of specific cargo molecules at the TGN.
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Affiliation(s)
- Alvaro H. Crevenna
- Physical Chemistry, Department of Chemistry Center for Nanoscience, Nanosystems Initiative Munich and Center for Integrated Protein Science Munich, Ludwig Maximilians University Munich, 81377 Munich, Germany
| | - Birgit Blank
- Max Planck Institute of Biochemistry, 82152 Martinsried, Germany
| | - Andreas Maiser
- Department of Biology II, Ludwig Maximilian University Munich, 82152 Martinsried, Germany
- Center for Integrated Protein Science, Ludwig Maximilians University Munich, 82152 Martinsried, Germany
| | - Derya Emin
- Physical Chemistry, Department of Chemistry Center for Nanoscience, Nanosystems Initiative Munich and Center for Integrated Protein Science Munich, Ludwig Maximilians University Munich, 81377 Munich, Germany
| | - Jens Prescher
- Physical Chemistry, Department of Chemistry Center for Nanoscience, Nanosystems Initiative Munich and Center for Integrated Protein Science Munich, Ludwig Maximilians University Munich, 81377 Munich, Germany
| | - Gisela Beck
- Max Planck Institute of Biochemistry, 82152 Martinsried, Germany
| | | | - Kira Bartnik
- Physical Chemistry, Department of Chemistry Center for Nanoscience, Nanosystems Initiative Munich and Center for Integrated Protein Science Munich, Ludwig Maximilians University Munich, 81377 Munich, Germany
| | - Bianca Habermann
- Max Planck Institute of Biochemistry, 82152 Martinsried, Germany
| | - Mehrshad Pakdel
- Max Planck Institute of Biochemistry, 82152 Martinsried, Germany
| | - Heinrich Leonhardt
- Department of Biology II, Ludwig Maximilian University Munich, 82152 Martinsried, Germany
- Center for Integrated Protein Science, Ludwig Maximilians University Munich, 82152 Martinsried, Germany
| | - Don C. Lamb
- Physical Chemistry, Department of Chemistry Center for Nanoscience, Nanosystems Initiative Munich and Center for Integrated Protein Science Munich, Ludwig Maximilians University Munich, 81377 Munich, Germany
| | - Julia von Blume
- Max Planck Institute of Biochemistry, 82152 Martinsried, Germany
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von Blume J, Sedwick C. Julia von Blume: sorting through the trans-Golgi. J Cell Biol 2015; 208:4-5. [PMID: 25559180 PMCID: PMC4284231 DOI: 10.1083/jcb.2081pi] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
von Blume studies the mechanisms of protein sorting in the Golgi.
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Kienzle C, Basnet N, Crevenna AH, Beck G, Habermann B, Mizuno N, von Blume J. Cofilin recruits F-actin to SPCA1 and promotes Ca2+-mediated secretory cargo sorting. ACTA ACUST UNITED AC 2014; 206:635-54. [PMID: 25179631 PMCID: PMC4151145 DOI: 10.1083/jcb.201311052] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [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] [Indexed: 11/23/2022]
Abstract
The cofilin CFL-1 recruits actin to the P-type calcium ATPase SPCA1 at the trans-Golgi network, thereby activating the ATPase, promoting Ca2+ influx, and driving secretory cargo sorting. The actin filament severing protein cofilin-1 (CFL-1) is required for actin and P-type ATPase secretory pathway calcium ATPase (SPCA)-dependent sorting of secretory proteins at the trans-Golgi network (TGN). How these proteins interact and activate the pump to facilitate cargo sorting, however, is not known. We used purified proteins to assess interaction of the cytoplasmic domains of SPCA1 with actin and CFL-1. A 132–amino acid portion of the SPCA1 phosphorylation domain (P-domain) interacted with actin in a CFL-1–dependent manner. This domain, coupled to nickel nitrilotriacetic acid (Ni-NTA) agarose beads, specifically recruited F-actin in the presence of CFL-1 and, when expressed in HeLa cells, inhibited Ca2+ entry into the TGN and secretory cargo sorting. Mutagenesis of four amino acids in SPCA1 that represent the CFL-1 binding site also affected Ca2+ import into the TGN and secretory cargo sorting. Altogether, our findings reveal the mechanism of CFL-1–dependent recruitment of actin to SPCA1 and the significance of this interaction for Ca2+ influx and secretory cargo sorting.
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Affiliation(s)
| | - Nirakar Basnet
- Max Planck Institute of Biochemistry, 82152 Martinsried, Germany
| | - Alvaro H Crevenna
- Physical Chemistry, Department of Chemistry and Biochemistry and Center for NanoScience (CeNS), Ludwig Maximilians University of Munich, 81377 Munich, Germany
| | - Gisela Beck
- Max Planck Institute of Biochemistry, 82152 Martinsried, Germany
| | - Bianca Habermann
- Max Planck Institute of Biochemistry, 82152 Martinsried, Germany
| | - Naoko Mizuno
- Max Planck Institute of Biochemistry, 82152 Martinsried, Germany
| | - Julia von Blume
- Max Planck Institute of Biochemistry, 82152 Martinsried, Germany
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25
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Kienzle C, von Blume J. Secretory cargo sorting at the trans-Golgi network. Trends Cell Biol 2014; 24:584-93. [DOI: 10.1016/j.tcb.2014.04.007] [Citation(s) in RCA: 66] [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: 12/05/2013] [Revised: 04/15/2014] [Accepted: 04/16/2014] [Indexed: 12/22/2022]
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26
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von Blume J, Alleaume AM, Kienzle C, Carreras-Sureda A, Valverde M, Malhotra V. Cab45 is required for Ca(2+)-dependent secretory cargo sorting at the trans-Golgi network. ACTA ACUST UNITED AC 2013; 199:1057-66. [PMID: 23266954 PMCID: PMC3529532 DOI: 10.1083/jcb.201207180] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.3] [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] [Indexed: 01/05/2023]
Abstract
The Golgi resident protein Cab45 is required for trans-Golgi network Ca2+ homeostasis and sorting of cargos that are destined for secretion. Ca2+ import into the lumen of the trans-Golgi network (TGN) by the secretory pathway calcium ATPase1 (SPCA1) is required for the sorting of secretory cargo. How is Ca2+ retained in the lumen of the Golgi, and what is its role in cargo sorting? We show here that a soluble, lumenal Golgi resident protein, Cab45, is required for SPCA1-dependent Ca2+ import into the TGN; it binds secretory cargo in a Ca2+-dependent reaction and is required for its sorting at the TGN.
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Affiliation(s)
- Julia von Blume
- Max Planck Institute for Biochemistry, 82152 Martinsried, Germany
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Abstract
Sorting of secretory cargo from the Golgi remains an elusive process. Previously a role was identified for cofilin and the Ca2+ATPase SPCA1 in sorting of secretory cargo from the Golgi of mammalian cells. Now it is shown that the yeast orthologues cofilin and Pmr1 are also required for sorting of selective secretory cargo at the Golgi in yeast. The mechanism of cargo sorting at the trans-Golgi network (TGN) for secretion is poorly understood. We previously reported the involvement of the actin-severing protein cofilin and the Ca2+ ATPase secretory pathway calcium ATPase 1 (SPCA1) in the sorting of soluble secretory cargo at the TGN in mammalian cells. Now we report that cofilin in yeast is required for export of selective secretory cargo at the late Golgi membranes. In cofilin mutant (cof1-8) cells, the cell wall protein Bgl2 was secreted at a reduced rate and retained in a late Golgi compartment, whereas the plasma membrane H+ ATPase Pma1, which is transported in the same class of carriers, reached the cell surface. In addition, sorting of carboxypeptidase Y (CPY) to the vacuole was delayed, and CPY was secreted from cof1-8 cells. Loss of the yeast orthologue of SPCA1 (Pmr1) exhibited similar sorting defects and displayed synthetic sickness with cof1-8. In addition, overexpression of PMR1 restored Bgl2 secretion in cof1-8 cells. These findings highlight the conserved role of cofilin and SPCA1/Pmr1 in sorting of the soluble secretory proteins at the TGN/late Golgi membranes in eukaryotes.
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Affiliation(s)
- Amy J Curwin
- Department of Cell and Developmental Biology, Centre for Genomic Regulation, 08003 Barcelona, Spain
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Pusapati GV, Krndija D, Armacki M, von Wichert G, von Blume J, Malhotra V, Adler G, Seufferlein T. Role of the second cysteine-rich domain and Pro275 in protein kinase D2 interaction with ADP-ribosylation factor 1, trans-Golgi network recruitment, and protein transport. Mol Biol Cell 2010; 21:1011-22. [PMID: 20089835 PMCID: PMC2836954 DOI: 10.1091/mbc.e09-09-0814] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.8] [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] [Indexed: 11/11/2022] Open
Abstract
Protein kinase D (PKD) isoenzymes regulate the formation of transport carriers from the trans-Golgi network (TGN) that are en route to the plasma membrane. The PKD C1a domain is required for the localization of PKDs at the TGN. However, the precise mechanism of how PKDs are recruited to the TGN is still elusive. Here, we report that ADP-ribosylation factor (ARF1), a small GTPase of the Ras superfamily and a key regulator of secretory traffic, specifically interacts with PKD isoenzymes. ARF1, but not ARF6, binds directly to the second cysteine-rich domain (C1b) of PKD2, and precisely to Pro275 within this domain. Pro275 in PKD2 is not only crucial for the PKD2-ARF1 interaction but also for PKD2 recruitment to and PKD2 function at the TGN, namely, protein transport to the plasma membrane. Our data suggest a novel model in which ARF1 recruits PKD2 to the TGN by binding to Pro275 in its C1b domain followed by anchoring of PKD2 in the TGN membranes via binding of its C1a domain to diacylglycerol. Both processes are critical for PKD2-mediated protein transport.
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von Blume J, Duran JM, Forlanelli E, Alleaume AM, Egorov M, Polishchuk R, Molina H, Malhotra V. Actin remodeling by ADF/cofilin is required for cargo sorting at the trans-Golgi network. ACTA ACUST UNITED AC 2009; 187:1055-69. [PMID: 20026655 PMCID: PMC2806282 DOI: 10.1083/jcb.200908040] [Citation(s) in RCA: 90] [Impact Index Per Article: 6.0] [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] [Indexed: 11/22/2022]
Abstract
Sorting of both soluble and integral membrane proteins is disrupted by loss of ADF/cofilin, suggesting that actin severing controls expansion of a sorting domain within the TGN. Knockdown of the actin-severing protein actin-depolymerizing factor (ADF)/cofilin inhibited export of an exogenously expressed soluble secretory protein from Golgi membranes in Drosophilamelanogaster and mammalian tissue culture cells. A stable isotope labeling by amino acids in cell culture mass spectrometry–based protein profiling revealed that a large number of endogenous secretory proteins in mammalian cells were not secreted upon ADF/cofilin knockdown. Although many secretory proteins were retained, a Golgi-resident protein and a lysosomal hydrolase were aberrantly secreted upon ADF/cofilin knockdown. Overall, our findings indicate that inactivation of ADF/cofilin perturbed the sorting of a subset of both soluble and integral membrane proteins at the trans-Golgi network (TGN). We suggest that ADF/cofilin-dependent actin trimming generates a sorting domain at the TGN, which filters secretory cargo for export, and that uncontrolled growth of this domain causes missorting of proteins. This type of actin-dependent compartmentalization and filtering of secretory cargo at the TGN by ADF/cofilin could explain sorting of proteins that are destined to the cell surface.
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Affiliation(s)
- Julia von Blume
- Department of Cell and Developmental Biology, Centre de Regulació Genòmica, Barcelona, Spain
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Auer A, von Blume J, Sturany S, von Wichert G, Van Lint J, Vandenheede J, Adler G, Seufferlein T. Role of the regulatory domain of protein kinase D2 in phorbol ester binding, catalytic activity, and nucleocytoplasmic shuttling. Mol Biol Cell 2005; 16:4375-85. [PMID: 15975900 PMCID: PMC1196345 DOI: 10.1091/mbc.e05-03-0251] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2005] [Revised: 05/12/2005] [Accepted: 06/09/2005] [Indexed: 11/11/2022] Open
Abstract
Protein kinase D2 (PKD2) belongs to the PKD family of serine/threonine kinases that is activated by phorbol esters and G protein-coupled receptors (GPCRs). Its C-terminal regulatory domain comprises two cysteine-rich domains (C1a/C1b) followed by a pleckstrin homology (PH) domain. Here, we examined the role of the regulatory domain in PKD2 phorbol ester binding, catalytic activity, and subcellular localization: The PH domain is a negative regulator of kinase activity. C1a/C1b, in particular C1b, is required for phorbol ester binding and gastrin-stimulated PKD2 activation, but it has no inhibitory effect on the catalytic activity. Gastrin triggers nuclear accumulation of PKD2 in living AGS-B cancer cells. C1a/C1b, not the PH domain, plays a complex role in the regulation of nucleocytoplasmic shuttling: We identified a nuclear localization sequence in the linker region between C1a and C1b and a nuclear export signal in the C1a domain. In conclusion, our results define the critical components of the PKD2 regulatory domain controlling phorbol ester binding, catalytic activity, and nucleocytoplasmic shuttling and reveal marked differences to the regulatory properties of this domain in PKD1. These findings could explain functional differences between PKD isoforms and point to a functional role of PKD2 in the nucleus upon activation by GPCRs.
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Affiliation(s)
- Alexandra Auer
- Department of Internal Medicine l, Medical University of Ulm, Ulm 89081, Germany
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