1
|
Pulido S, Rückert H, Falsone SF, Göbl C, Meyer NH, Zangger K. The membrane-binding bacterial toxin long direct repeat D inhibits protein translation. Biophys Chem 2023; 298:107040. [PMID: 37229877 DOI: 10.1016/j.bpc.2023.107040] [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: 02/28/2023] [Revised: 05/08/2023] [Accepted: 05/08/2023] [Indexed: 05/27/2023]
Abstract
Bacterial plasmids and chromosomes widely contain toxin-antitoxin (TA) loci, which are implicated in stress response, growth regulation and even tolerance to antibiotics and environmental stress. Type I TA systems consist of a stable toxin-expressing mRNA, which is counteracted by an unstable RNA antitoxin. The Long Direct Repeat (LDR-) D locus, a type I TA system of Escherichia Coli (E. coli) K12, encodes a 35 amino acid toxic peptide, LdrD. Despite being characterized as a bacterial toxin, causing rapid killing and nucleoid condensation, little was known about its function and its mechanism of toxicity. Here, we show that LdrD specifically interacts with ribosomes which potentially blocks translation. Indeed, in vitro translation of LdrD-coding mRNA greatly reduces translation efficiency. The structure of LdrD in a hydrophobic environment, similar to the one found in the interior of ribosomes was determined by NMR spectroscopy in 100% trifluoroethanol solution. A single compact α-helix was found which would fit nicely into the ribosomal exit tunnel. Therefore, we conclude that rather than destroying bacterial membranes, LdrD exerts its toxic activity by inhibiting protein synthesis through binding to the ribosomes.
Collapse
Affiliation(s)
- Sergio Pulido
- Institute of Chemistry, University of Graz, Graz, Austria; LifeFactors ZF S.A.S., Zona France Rionegro, Rionegro, Colombia
| | - Hanna Rückert
- Institute of Chemistry, University of Graz, Graz, Austria
| | - S Fabio Falsone
- Institute of Pharmaceutical Sciences, University of Graz, Graz, Austria
| | - Christoph Göbl
- Dept. of Pathology and Biomedical Science, University of Otago, Christchurch, New Zealand
| | - N Helge Meyer
- Institute of Chemistry, University of Graz, Graz, Austria; Division of General and Visceral Surgery, Department of Human Medicine, University of Oldenburg, Germany.
| | - Klaus Zangger
- Institute of Chemistry, University of Graz, Graz, Austria.
| |
Collapse
|
2
|
Bozonet SM, Magon NJ, Schwartfeger AJ, Konigstorfer A, Heath SG, Vissers MCM, Morris VK, Göbl C, Murphy JM, Salvesen GS, Hampton MB. Oxidation of caspase-8 by hypothiocyanous acid enables TNF-mediated necroptosis. J Biol Chem 2023:104792. [PMID: 37150321 DOI: 10.1016/j.jbc.2023.104792] [Citation(s) in RCA: 3] [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: 01/31/2023] [Revised: 04/18/2023] [Accepted: 04/19/2023] [Indexed: 05/09/2023] Open
Abstract
Necroptosis is a form of regulated cell death triggered by various host and pathogen-derived molecules during infection and inflammation. The essential step leading to necroptosis is phosphorylation of the mixed lineage kinase domain-like protein (MLKL) by receptor-interacting protein kinase 3 (RIPK3). Caspase 8 cleaves RIPKs to block necroptosis, so synthetic caspase inhibitors are required to study this process in experimental models. However, it is unclear how caspase-8 activity is regulated in a physiological setting. The active site cysteine of caspases is sensitive to oxidative inactivation, so we hypothesized that oxidants generated at sites of inflammation can inhibit caspase-8 and promote necroptosis. Here, we discovered that hypothiocyanous acid (HOSCN), an oxidant generated in vivo by heme peroxidases including myeloperoxidase and lactoperoxidase, is a potent caspase-8 inhibitor. We found HOSCN was able to promote necroptosis in mouse fibroblasts treated with tumor necrosis factor (TNF). We also demonstrate purified caspase-8 was inactivated by low concentrations of HOSCN, with the predominant product being a disulfide-linked dimer between Cys360 and Cys409 of the large and small catalytic subunits. We show oxidation still occurred in the presence of reducing agents, and reduction of the dimer was slow, consistent with HOSCN being a powerful physiological caspase inhibitor. While the initial oxidation product is a dimer, further modification also occurred in cells treated with HOSCN, leading to higher molecular weight caspase-8 species. Taken together, these findings indicate major disruption of caspase-8 function, and suggest a novel mechanism for the promotion of necroptosis at sites of inflammation.
Collapse
Affiliation(s)
- S M Bozonet
- Mātai Hāora - Centre for Redox Biology and Medicine, Department of Pathology and Biomedical Science, University of Otago, Christchurch, New Zealand
| | - N J Magon
- Mātai Hāora - Centre for Redox Biology and Medicine, Department of Pathology and Biomedical Science, University of Otago, Christchurch, New Zealand
| | - A J Schwartfeger
- School of Biological Sciences, University of Canterbury, Christchurch, New Zealand
| | - A Konigstorfer
- Mātai Hāora - Centre for Redox Biology and Medicine, Department of Pathology and Biomedical Science, University of Otago, Christchurch, New Zealand
| | - S G Heath
- Mātai Hāora - Centre for Redox Biology and Medicine, Department of Pathology and Biomedical Science, University of Otago, Christchurch, New Zealand
| | - M C M Vissers
- Mātai Hāora - Centre for Redox Biology and Medicine, Department of Pathology and Biomedical Science, University of Otago, Christchurch, New Zealand
| | - V K Morris
- School of Biological Sciences, University of Canterbury, Christchurch, New Zealand
| | - C Göbl
- Mātai Hāora - Centre for Redox Biology and Medicine, Department of Pathology and Biomedical Science, University of Otago, Christchurch, New Zealand; School of Biological Sciences, University of Canterbury, Christchurch, New Zealand
| | - J M Murphy
- The Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria, Australia; Department of Medical Biology, University of Melbourne, Parkville, Victoria, Australia
| | - G S Salvesen
- Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA, USA
| | - M B Hampton
- Mātai Hāora - Centre for Redox Biology and Medicine, Department of Pathology and Biomedical Science, University of Otago, Christchurch, New Zealand.
| |
Collapse
|
3
|
Nechanitzky R, Nechanitzky D, Ramachandran P, Duncan GS, Zheng C, Göbl C, Gill KT, Haight J, Wakeham AC, Snow BE, Bradaschia-Correa V, Ganguly M, Lu Z, Saunders ME, Flavell RA, Mak TW. Cholinergic control of Th17 cell pathogenicity in experimental autoimmune encephalomyelitis. Cell Death Differ 2023; 30:407-416. [PMID: 36528755 PMCID: PMC9950465 DOI: 10.1038/s41418-022-01092-y] [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: 01/07/2022] [Revised: 11/03/2022] [Accepted: 11/11/2022] [Indexed: 12/23/2022] Open
Abstract
Experimental autoimmune encephalomyelitis (EAE) is a mouse model of multiple sclerosis (MS) in which Th17 cells have a crucial but unclear function. Here we show that choline acetyltransferase (ChAT), which synthesizes acetylcholine (ACh), is a critical driver of pathogenicity in EAE. Mice with ChAT-deficient Th17 cells resist disease progression and show reduced brain-infiltrating immune cells. ChAT expression in Th17 cells is linked to strong TCR signaling, expression of the transcription factor Bhlhe40, and increased Il2, Il17, Il22, and Il23r mRNA levels. ChAT expression in Th17 cells is independent of IL21r signaling but dampened by TGFβ, implicating ChAT in controlling the dichotomous nature of Th17 cells. Our study establishes a cholinergic program in which ACh signaling primes chronic activation of Th17 cells, and thereby constitutes a pathogenic determinant of EAE. Our work may point to novel targets for therapeutic immunomodulation in MS.
Collapse
Affiliation(s)
- Robert Nechanitzky
- Princess Margaret Cancer Centre, Ontario Cancer Institute, University Health Network, Toronto, ON, Canada
| | - Duygu Nechanitzky
- Princess Margaret Cancer Centre, Ontario Cancer Institute, University Health Network, Toronto, ON, Canada
| | - Parameswaran Ramachandran
- Princess Margaret Cancer Centre, Ontario Cancer Institute, University Health Network, Toronto, ON, Canada
| | - Gordon S Duncan
- Princess Margaret Cancer Centre, Ontario Cancer Institute, University Health Network, Toronto, ON, Canada
| | - Chunxing Zheng
- Princess Margaret Cancer Centre, Ontario Cancer Institute, University Health Network, Toronto, ON, Canada
| | - Christoph Göbl
- Department of Pathology and Biomedical Science, University of Otago Christchurch, Christchurch, New Zealand
| | - Kyle T Gill
- Princess Margaret Cancer Centre, Ontario Cancer Institute, University Health Network, Toronto, ON, Canada
| | - Jillian Haight
- Princess Margaret Cancer Centre, Ontario Cancer Institute, University Health Network, Toronto, ON, Canada
| | - Andrew C Wakeham
- Princess Margaret Cancer Centre, Ontario Cancer Institute, University Health Network, Toronto, ON, Canada
| | - Bryan E Snow
- Princess Margaret Cancer Centre, Ontario Cancer Institute, University Health Network, Toronto, ON, Canada
| | | | - Milan Ganguly
- Histology Core, The Centre for Phenogenomics, Toronto, ON, Canada
| | - Zhibin Lu
- UHN Bioinformatics and HPC Core, Toronto, ON, Canada
| | - Mary E Saunders
- Princess Margaret Cancer Centre, Ontario Cancer Institute, University Health Network, Toronto, ON, Canada
| | - Richard A Flavell
- Department of Immunobiology, School of Medicine, Yale University, New Haven, CT, 06520, USA
- Howard Hughes Medical Institute, Yale University School of Medicine, New Haven, CT, 06520, USA
| | - Tak W Mak
- Princess Margaret Cancer Centre, Ontario Cancer Institute, University Health Network, Toronto, ON, Canada.
- Departments of Immunology and Medical Biophysics, University of Toronto, Toronto, ON, Canada.
- Department of Pathology, School of Clinical Medicine, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong SAR, China.
- Centre for Oncology and Immunology, Hong Kong Science Park, Hong Kong SAR, China.
| |
Collapse
|
4
|
Reischer T, Niedermaier K, Göbl C, Catic A, Yerlikaya-Schatten G. Einfluss des Ersttrimester Screenings und Organscreenings auf die Fetozidrate. Geburtshilfe Frauenheilkd 2022. [DOI: 10.1055/s-0042-1750249] [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: 10/17/2022] Open
|
5
|
Reischer T, Muth B, Catic A, Monod C, Linder T, Göbl C, Yerlikaya-Schatten G. Klinischer Verlauf und Outcome vom nicht-immunologischen fetalen Hydrops bei Einlingsschwangerschaften. Geburtshilfe Frauenheilkd 2022. [DOI: 10.1055/s-0042-1750250] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022] Open
Affiliation(s)
- T Reischer
- Abteilung für Geburtshilfe und Feto-maternale Medizin; Medizinische Universität Wien
| | - B Muth
- Abteilung für Geburtshilfe und Feto-maternale Medizin; Medizinische Universität Wien
| | - A Catic
- Abteilung für Geburtshilfe und Feto-maternale Medizin; Medizinische Universität Wien
| | - C Monod
- Abteilung für Gynäkologie und Geburtshilfe, Universitätsspital Basel
| | - T Linder
- Abteilung für Geburtshilfe und Feto-maternale Medizin; Medizinische Universität Wien
| | - C Göbl
- Abteilung für Geburtshilfe und Feto-maternale Medizin; Medizinische Universität Wien
| | - G Yerlikaya-Schatten
- Abteilung für Geburtshilfe und Feto-maternale Medizin; Medizinische Universität Wien
| |
Collapse
|
6
|
Peskin AV, Meotti FC, Kean KM, Göbl C, Peixoto AS, Pace PE, Horne CR, Heath SG, Crowther JM, Dobson RCJ, Karplus PA, Winterbourn CC. Modifying the resolving cysteine affects the structure and hydrogen peroxide reactivity of peroxiredoxin 2. J Biol Chem 2021; 296:100494. [PMID: 33667550 PMCID: PMC8049995 DOI: 10.1016/j.jbc.2021.100494] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [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: 12/05/2020] [Revised: 02/23/2021] [Accepted: 02/26/2021] [Indexed: 01/05/2023] Open
Abstract
Peroxiredoxin 2 (Prdx2) is a thiol peroxidase with an active site Cys (C52) that reacts rapidly with H2O2 and other peroxides. The sulfenic acid product condenses with the resolving Cys (C172) to form a disulfide which is recycled by thioredoxin or GSH via mixed disulfide intermediates or undergoes hyperoxidation to the sulfinic acid. C172 lies near the C terminus, outside the active site. It is not established whether structural changes in this region, such as mixed disulfide formation, affect H2O2 reactivity. To investigate, we designed mutants to cause minimal (C172S) or substantial (C172D and C172W) structural disruption. Stopped flow kinetics and mass spectrometry showed that mutation to Ser had minimal effect on rates of oxidation and hyperoxidation, whereas Asp and Trp decreased both by ∼100-fold. To relate to structural changes, we solved the crystal structures of reduced WT and C172S Prdx2. The WT structure is highly similar to that of the published hyperoxidized form. C172S is closely related but more flexible and as demonstrated by size exclusion chromatography and analytical ultracentrifugation, a weaker decamer. Size exclusion chromatography and analytical ultracentrifugation showed that the C172D and C172W mutants are also weaker decamers than WT, and small-angle X-ray scattering analysis indicated greater flexibility with partially unstructured regions consistent with C-terminal unfolding. We propose that these structural changes around C172 negatively impact the active site geometry to decrease reactivity with H2O2. This is relevant for Prdx turnover as intermediate mixed disulfides with C172 would also be disruptive and could potentially react with peroxides before resolution is complete.
Collapse
Affiliation(s)
- Alexander V Peskin
- Department of Pathology and Biomedical Science, University of Otago Christchurch, Christchurch, New Zealand
| | - Flavia C Meotti
- Department of Biochemistry, Chemistry Institute, University of Sao Paulo, Sao Paulo, SP, Brazil
| | - Kelsey M Kean
- Department of Biochemistry and Biophysics, Oregon State University, Corvallis, Oregon, USA
| | - Christoph Göbl
- Department of Pathology and Biomedical Science, University of Otago Christchurch, Christchurch, New Zealand
| | - Albert Souza Peixoto
- Department of Biochemistry, Chemistry Institute, University of Sao Paulo, Sao Paulo, SP, Brazil
| | - Paul E Pace
- Department of Pathology and Biomedical Science, University of Otago Christchurch, Christchurch, New Zealand
| | - Christopher R Horne
- School of Biological Sciences, University of Canterbury, Christchurch, New Zealand
| | - Sarah G Heath
- Department of Pathology and Biomedical Science, University of Otago Christchurch, Christchurch, New Zealand
| | - Jennifer M Crowther
- School of Biological Sciences, University of Canterbury, Christchurch, New Zealand
| | - Renwick C J Dobson
- School of Biological Sciences, University of Canterbury, Christchurch, New Zealand
| | - P Andrew Karplus
- Department of Biochemistry and Biophysics, Oregon State University, Corvallis, Oregon, USA.
| | - Christine C Winterbourn
- Department of Pathology and Biomedical Science, University of Otago Christchurch, Christchurch, New Zealand.
| |
Collapse
|
7
|
Harjes E, Jameson GB, Tu YH, Burr N, Loo TS, Goroncy AK, Edwards PJB, Harjes S, Munro B, Göbl C, Sattlegger E, Norris GE. Experimentally based structural model of Yih1 provides insight into its function in controlling the key translational regulator Gcn2. FEBS Lett 2020; 595:324-340. [PMID: 33156522 DOI: 10.1002/1873-3468.13990] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2020] [Revised: 10/21/2020] [Accepted: 11/02/2020] [Indexed: 12/15/2022]
Abstract
Yeast impact homolog 1 (Yih1), or IMPACT in mammals, is part of a conserved regulatory module controlling the activity of General Control Nonderepressible 2 (Gcn2), a protein kinase that regulates protein synthesis. Yih1/IMPACT is implicated not only in many essential cellular processes, such as neuronal development, immune system regulation and the cell cycle, but also in cancer. Gcn2 must bind to Gcn1 in order to impair the initiation of protein translation. Yih1 hinders this key Gcn1-Gcn2 interaction by binding to Gcn1, thus preventing Gcn2-mediated inhibition of protein synthesis. Here, we solved the structures of the two domains of Saccharomyces cerevisiae Yih1 separately using Nuclear Magnetic Resonance and determined the relative positions of the two domains using a range of biophysical methods. Our findings support a compact structural model of Yih1 in which the residues required for Gcn1 binding are buried in the interface. This model strongly implies that Yih1 undergoes a large conformational rearrangement from a latent closed state to a primed open state to bind Gcn1. Our study provides structural insight into the interactions of Yih1 with partner molecules.
Collapse
Affiliation(s)
- Elena Harjes
- School of Fundamental Sciences, Massey University, Palmerston North, New Zealand.,Maurice Wilkins Centre for Molecular BioDiscovery, Massey University, Palmerston North, New Zealand
| | - Geoffrey B Jameson
- School of Fundamental Sciences, Massey University, Palmerston North, New Zealand.,Maurice Wilkins Centre for Molecular BioDiscovery, Massey University, Palmerston North, New Zealand
| | - Yi-Hsuan Tu
- School of Fundamental Sciences, Massey University, Palmerston North, New Zealand
| | - Natalie Burr
- School of Fundamental Sciences, Massey University, Palmerston North, New Zealand
| | - Trevor S Loo
- School of Fundamental Sciences, Massey University, Palmerston North, New Zealand
| | - Alexander K Goroncy
- School of Fundamental Sciences, Massey University, Palmerston North, New Zealand
| | - Patrick J B Edwards
- School of Fundamental Sciences, Massey University, Palmerston North, New Zealand
| | - Stefan Harjes
- School of Fundamental Sciences, Massey University, Palmerston North, New Zealand
| | - Ben Munro
- School of Fundamental Sciences, Massey University, Palmerston North, New Zealand
| | - Christoph Göbl
- Centre for Free Radical Research, Department of Pathology, University of Otago, Christchurch, New Zealand
| | - Evelyn Sattlegger
- Maurice Wilkins Centre for Molecular BioDiscovery, Massey University, Palmerston North, New Zealand.,School of Natural and Computational Sciences, Massey University, Auckland, New Zealand
| | - Gillian E Norris
- School of Fundamental Sciences, Massey University, Palmerston North, New Zealand.,Maurice Wilkins Centre for Molecular BioDiscovery, Massey University, Palmerston North, New Zealand
| |
Collapse
|
8
|
Göbl C, Morris VK, van Dam L, Visscher M, Polderman PE, Hartlmüller C, de Ruiter H, Hora M, Liesinger L, Birner-Gruenberger R, Vos HR, Reif B, Madl T, Dansen TB. Cysteine oxidation triggers amyloid fibril formation of the tumor suppressor p16 INK4A. Redox Biol 2020; 28:101316. [PMID: 31539802 PMCID: PMC6812003 DOI: 10.1016/j.redox.2019.101316] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [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: 07/07/2019] [Revised: 08/28/2019] [Accepted: 09/01/2019] [Indexed: 02/09/2023] Open
Abstract
The tumor suppressor p16INK4A induces cell cycle arrest and senescence in response to oncogenic transformation and is therefore frequently lost in cancer. p16INK4A is also known to accumulate under conditions of oxidative stress. Thus, we hypothesized it could potentially be regulated by reversible oxidation of cysteines (redox signaling). Here we report that oxidation of the single cysteine in p16INK4A in human cells occurs under relatively mild oxidizing conditions and leads to disulfide-dependent dimerization. p16INK4A is an all α-helical protein, but we find that upon cysteine-dependent dimerization, p16INK4A undergoes a dramatic structural rearrangement and forms aggregates that have the typical features of amyloid fibrils, including binding of diagnostic dyes, presence of cross-β sheet structure, and typical dimensions found in electron microscopy. p16INK4A amyloid formation abolishes its function as a Cyclin Dependent Kinase 4/6 inhibitor. Collectively, these observations mechanistically link the cellular redox state to the inactivation of p16INK4A through the formation of amyloid fibrils.
Collapse
Affiliation(s)
- Christoph Göbl
- Center for Integrated Protein Science Munich (CIPSM) at the Department of Chemistry Technische Universität München, Lichtenbergstr. 4, 85747, Garching, Germany; Institute of Structural Biology, Helmholtz Zentrum München, 85764, Neuherberg, Germany
| | - Vanessa K Morris
- Center for Integrated Protein Science Munich (CIPSM) at the Department of Chemistry Technische Universität München, Lichtenbergstr. 4, 85747, Garching, Germany; Institute of Structural Biology, Helmholtz Zentrum München, 85764, Neuherberg, Germany
| | - Loes van Dam
- Center for Molecular Medicine, Molecular Cancer Research, University Medical Center Utrecht, Universiteitsweg 100, 3584CG, Utrecht, The Netherlands
| | - Marieke Visscher
- Center for Molecular Medicine, Molecular Cancer Research, University Medical Center Utrecht, Universiteitsweg 100, 3584CG, Utrecht, The Netherlands
| | - Paulien E Polderman
- Center for Molecular Medicine, Molecular Cancer Research, University Medical Center Utrecht, Universiteitsweg 100, 3584CG, Utrecht, The Netherlands
| | - Christoph Hartlmüller
- Center for Integrated Protein Science Munich (CIPSM) at the Department of Chemistry Technische Universität München, Lichtenbergstr. 4, 85747, Garching, Germany; Institute of Structural Biology, Helmholtz Zentrum München, 85764, Neuherberg, Germany
| | - Hesther de Ruiter
- Center for Molecular Medicine, Molecular Cancer Research, University Medical Center Utrecht, Universiteitsweg 100, 3584CG, Utrecht, The Netherlands
| | - Manuel Hora
- Center for Integrated Protein Science Munich (CIPSM) at the Department of Chemistry Technische Universität München, Lichtenbergstr. 4, 85747, Garching, Germany; Institute of Structural Biology, Helmholtz Zentrum München, 85764, Neuherberg, Germany
| | - Laura Liesinger
- Omics Center Graz, BioTechMed-Graz, Graz, Austria; Gottfried Schatz Research Center for Cell Signaling, Metabolism and Aging, Molecular Biology and Biochemistry, Medical University of Graz, 8010, Graz, Austria
| | - Ruth Birner-Gruenberger
- Omics Center Graz, BioTechMed-Graz, Graz, Austria; Gottfried Schatz Research Center for Cell Signaling, Metabolism and Aging, Molecular Biology and Biochemistry, Medical University of Graz, 8010, Graz, Austria
| | - Harmjan R Vos
- Center for Molecular Medicine, Molecular Cancer Research, University Medical Center Utrecht, Universiteitsweg 100, 3584CG, Utrecht, The Netherlands
| | - Bernd Reif
- Center for Integrated Protein Science Munich (CIPSM) at the Department of Chemistry Technische Universität München, Lichtenbergstr. 4, 85747, Garching, Germany; Institute of Structural Biology, Helmholtz Zentrum München, 85764, Neuherberg, Germany
| | - Tobias Madl
- Gottfried Schatz Research Center for Cell Signaling, Metabolism and Aging, Molecular Biology and Biochemistry, Medical University of Graz, 8010, Graz, Austria; BioTechMed-Graz, Austria.
| | - Tobias B Dansen
- Center for Molecular Medicine, Molecular Cancer Research, University Medical Center Utrecht, Universiteitsweg 100, 3584CG, Utrecht, The Netherlands.
| |
Collapse
|
9
|
Hartlmüller C, Spreitzer E, Göbl C, Falsone F, Madl T. NMR characterization of solvent accessibility and transient structure in intrinsically disordered proteins. J Biomol NMR 2019; 73:305-317. [PMID: 31297688 PMCID: PMC6692294 DOI: 10.1007/s10858-019-00248-2] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2019] [Accepted: 04/11/2019] [Indexed: 05/12/2023]
Abstract
In order to understand the conformational behavior of intrinsically disordered proteins (IDPs) and their biological interaction networks, the detection of residual structure and long-range interactions is required. However, the large number of degrees of conformational freedom of disordered proteins require the integration of extensive sets of experimental data, which are difficult to obtain. Here, we provide a straightforward approach for the detection of residual structure and long-range interactions in IDPs under near-native conditions using solvent paramagnetic relaxation enhancement (sPRE). Our data indicate that for the general case of an unfolded chain, with a local flexibility described by the overwhelming majority of available combinations, sPREs of non-exchangeable protons can be accurately predicted through an ensemble-based fragment approach. We show for the disordered protein α-synuclein and disordered regions of the proteins FOXO4 and p53 that deviation from random coil behavior can be interpreted in terms of intrinsic propensity to populate local structure in interaction sites of these proteins and to adopt transient long-range structure. The presented modification-free approach promises to be applicable to study conformational dynamics of IDPs and other dynamic biomolecules in an integrative approach.
Collapse
Affiliation(s)
- Christoph Hartlmüller
- Center for Integrated Protein Science Munich (CIPSM) at the Department of Chemistry, Technische Universität München, Lichtenbergstrasse 4, 87548, Garching, Germany
| | - Emil Spreitzer
- Gottfried Schatz Research Center for Cell Signaling, Metabolism and Aging, Institute of Molecular Biology & Biochemistry, Medical University of Graz, Neue Stiftingtalstrasse 6, 8010, Graz, Austria
| | - Christoph Göbl
- The Campbell Family Institute for Breast Cancer Research at Princess Margaret Cancer Centre, 610 University Avenue, Toronto, ON, M5G 2M9, Canada
| | - Fabio Falsone
- Institute of Pharmaceutical Sciences, University of Graz, Schubertstrasse 1, 8010, Graz, Austria
| | - Tobias Madl
- Gottfried Schatz Research Center for Cell Signaling, Metabolism and Aging, Institute of Molecular Biology & Biochemistry, Medical University of Graz, Neue Stiftingtalstrasse 6, 8010, Graz, Austria.
- BioTechMed-Graz, Graz, Austria.
| |
Collapse
|
10
|
Weber B, Hora M, Kazman P, Göbl C, Camilloni C, Reif B, Buchner J. The Antibody Light-Chain Linker Regulates Domain Orientation and Amyloidogenicity. J Mol Biol 2018; 430:4925-4940. [PMID: 30414962 DOI: 10.1016/j.jmb.2018.10.024] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [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: 07/13/2018] [Revised: 10/04/2018] [Accepted: 10/28/2018] [Indexed: 12/21/2022]
Abstract
The antibody light chain (LC) consists of two domains and is essential for antigen binding in mature immunoglobulins. The two domains are connected by a highly conserved linker that comprises the structurally important Arg108 residue. In antibody light chain (AL) amyloidosis, a severe protein amyloid disease, the LC and its N-terminal variable domain (VL) convert to fibrils deposited in the tissues causing organ failure. Understanding the factors shaping the architecture of the LC is important for basic science, biotechnology and for deciphering the principles that lead to fibril formation. In this study, we examined the structure and properties of LC variants with a mutated or extended linker. We show that under destabilizing conditions, the linker modulates the amyloidogenicity of the LC. The fibril formation propensity of LC linker variants and their susceptibility to proteolysis directly correlate implying an interplay between the two LC domains. Using NMR and residual dipolar coupling-based simulations, we found that the linker residue Arg108 is a key factor regulating the relative orientation of the VL and CL domains, keeping them in a bent and dense, but still flexible conformation. Thus, inter-domain contacts and the relative orientation of VL and CL to each other are of major importance for maintaining the structural integrity of the full-length LC.
Collapse
Affiliation(s)
- Benedikt Weber
- Center for Integrated Protein Science Munich at the Department Chemie, Technische Universität München, Lichtenbergstr, 4, 85748 Garching, Germany
| | - Manuel Hora
- Center for Integrated Protein Science Munich at the Department Chemie, Technische Universität München, Lichtenbergstr, 4, 85748 Garching, Germany
| | - Pamina Kazman
- Center for Integrated Protein Science Munich at the Department Chemie, Technische Universität München, Lichtenbergstr, 4, 85748 Garching, Germany
| | - Christoph Göbl
- Center for Integrated Protein Science Munich at the Department Chemie, Technische Universität München, Lichtenbergstr, 4, 85748 Garching, Germany; Helmholtz Zentrum München, Institute of Structural Biology, Ingolstädter Landstr, 1, 85764 Neuherberg, Germany
| | - Carlo Camilloni
- Dipartimento di Bioscienze, Università degli studi di Milano, 20133 Milan, Italy
| | - Bernd Reif
- Center for Integrated Protein Science Munich at the Department Chemie, Technische Universität München, Lichtenbergstr, 4, 85748 Garching, Germany
| | - Johannes Buchner
- Center for Integrated Protein Science Munich at the Department Chemie, Technische Universität München, Lichtenbergstr, 4, 85748 Garching, Germany.
| |
Collapse
|
11
|
Cristóvão JS, Morris VK, Cardoso I, Leal SS, Martínez J, Botelho HM, Göbl C, David R, Kierdorf K, Alemi M, Madl T, Fritz G, Reif B, Gomes CM. The neuronal S100B protein is a calcium-tuned suppressor of amyloid-β aggregation. Sci Adv 2018; 4:eaaq1702. [PMID: 29963623 PMCID: PMC6025902 DOI: 10.1126/sciadv.aaq1702] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2017] [Accepted: 05/22/2018] [Indexed: 05/23/2023]
Abstract
Amyloid-β (Aβ) aggregation and neuroinflammation are consistent features in Alzheimer's disease (AD) and strong candidates for the initiation of neurodegeneration. S100B is one of the most abundant proinflammatory proteins that is chronically up-regulated in AD and is found associated with senile plaques. This recognized biomarker for brain distress may, thus, play roles in amyloid aggregation which remain to be determined. We report a novel role for the neuronal S100B protein as suppressor of Aβ42 aggregation and toxicity. We determined the structural details of the interaction between monomeric Aβ42 and S100B, which is favored by calcium binding to S100B, possibly involving conformational switching of disordered Aβ42 into an α-helical conformer, which locks aggregation. From nuclear magnetic resonance experiments, we show that this dynamic interaction occurs at a promiscuous peptide-binding region within the interfacial cleft of the S100B homodimer. This physical interaction is coupled to a functional role in the inhibition of Aβ42 aggregation and toxicity and is tuned by calcium binding to S100B. S100B delays the onset of Aβ42 aggregation by interacting with Aβ42 monomers inhibiting primary nucleation, and the calcium-bound state substantially affects secondary nucleation by inhibiting fibril surface-catalyzed reactions through S100B binding to growing Aβ42 oligomers and fibrils. S100B protects cells from Aβ42-mediated toxicity, rescuing cell viability and decreasing apoptosis induced by Aβ42 in cell cultures. Together, our findings suggest that molecular targeting of S100B could be translated into development of novel approaches to ameliorate AD neurodegeneration.
Collapse
Affiliation(s)
- Joana S. Cristóvão
- Biosystems and Integrative Sciences Institute, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal
- Departamento de Química e Bioquímica, Universidade de Lisboa, 1749-016 Lisboa, Portugal
| | - Vanessa K. Morris
- Center for Integrated Protein Science Munich, Department of Chemistry, Technische Universität München, Lichtenbergstrasse 4, 85748 Garching, Germany
- Helmholtz Zentrum München, Deutsches Forschungszentrum für Gesundheit und Umwelt, Ingolstädter Landstrasse 1, 85764 Neuherberg, Germany
| | - Isabel Cardoso
- Instituto de Biologia Molecular e Celular, Universidade do Porto, Porto, Portugal
- Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Porto, Portugal
| | - Sónia S. Leal
- Biosystems and Integrative Sciences Institute, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal
- Departamento de Química e Bioquímica, Universidade de Lisboa, 1749-016 Lisboa, Portugal
| | - Javier Martínez
- Biosystems and Integrative Sciences Institute, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal
- Departamento de Química e Bioquímica, Universidade de Lisboa, 1749-016 Lisboa, Portugal
| | - Hugo M. Botelho
- Biosystems and Integrative Sciences Institute, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal
| | - Christoph Göbl
- Center for Integrated Protein Science Munich, Department of Chemistry, Technische Universität München, Lichtenbergstrasse 4, 85748 Garching, Germany
- Helmholtz Zentrum München, Deutsches Forschungszentrum für Gesundheit und Umwelt, Ingolstädter Landstrasse 1, 85764 Neuherberg, Germany
| | - Rodrigo David
- Biosystems and Integrative Sciences Institute, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal
- Departamento de Química e Bioquímica, Universidade de Lisboa, 1749-016 Lisboa, Portugal
| | - Katrin Kierdorf
- Department of Neuropathology, University of Freiburg, Freiburg, Germany
| | - Mobina Alemi
- Instituto de Biologia Molecular e Celular, Universidade do Porto, Porto, Portugal
- Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Porto, Portugal
- Faculdade de Medicina, Universidade do Porto, Porto, Portugal
| | - Tobias Madl
- Center for Integrated Protein Science Munich, Department of Chemistry, Technische Universität München, Lichtenbergstrasse 4, 85748 Garching, Germany
- Helmholtz Zentrum München, Deutsches Forschungszentrum für Gesundheit und Umwelt, Ingolstädter Landstrasse 1, 85764 Neuherberg, Germany
- Institute of Molecular Biology and Biochemistry, Center of Molecular Medicine, Medical University of Graz, 8010 Graz, Austria
| | - Günter Fritz
- Department of Neuropathology, University of Freiburg, Freiburg, Germany
| | - Bernd Reif
- Center for Integrated Protein Science Munich, Department of Chemistry, Technische Universität München, Lichtenbergstrasse 4, 85748 Garching, Germany
- Helmholtz Zentrum München, Deutsches Forschungszentrum für Gesundheit und Umwelt, Ingolstädter Landstrasse 1, 85764 Neuherberg, Germany
| | - Cláudio M. Gomes
- Biosystems and Integrative Sciences Institute, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal
- Departamento de Química e Bioquímica, Universidade de Lisboa, 1749-016 Lisboa, Portugal
| |
Collapse
|
12
|
Göbl C, Focke-Tejkl M, Najafi N, Schrank E, Madl T, Kosol S, Madritsch C, Dorofeeva Y, Flicker S, Thalhamer J, Valenta R, Zangger K, Tjandra N. Flexible IgE epitope-containing domains of Phl p 5 cause high allergenic activity. J Allergy Clin Immunol 2017; 140:1187-1191. [PMID: 28532654 DOI: 10.1016/j.jaci.2017.05.005] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2016] [Revised: 04/20/2017] [Accepted: 05/01/2017] [Indexed: 11/19/2022]
Affiliation(s)
- Christoph Göbl
- Institute of Chemistry/Organic and Bioorganic Chemistry, University of Graz, Graz, Austria; Institute of Structural Biology, Helmholtz Zentrum München, Neuherberg, Germany; Biomolecular NMR, Department of Chemistry, Technische Universität München, Garching, Germany; Laboratory of Molecular Biophysics, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Md
| | - Margarete Focke-Tejkl
- Division of Immunopathology, Department of Pathophysiology and Allergy Research, Medical University of Vienna, Vienna, Austria
| | - Nazanin Najafi
- Division of Immunopathology, Department of Pathophysiology and Allergy Research, Medical University of Vienna, Vienna, Austria
| | - Evelyne Schrank
- Institute of Chemistry/Organic and Bioorganic Chemistry, University of Graz, Graz, Austria
| | - Tobias Madl
- Institute of Structural Biology, Helmholtz Zentrum München, Neuherberg, Germany; Biomolecular NMR, Department of Chemistry, Technische Universität München, Garching, Germany; Institute of Molecular Biology & Biochemistry, Center of Molecular Medicine, Medical University of Graz, Graz, Austria
| | - Simone Kosol
- Institute of Chemistry/Organic and Bioorganic Chemistry, University of Graz, Graz, Austria
| | - Christoph Madritsch
- Division of Immunopathology, Department of Pathophysiology and Allergy Research, Medical University of Vienna, Vienna, Austria
| | - Yulia Dorofeeva
- Division of Immunopathology, Department of Pathophysiology and Allergy Research, Medical University of Vienna, Vienna, Austria
| | - Sabine Flicker
- Division of Immunopathology, Department of Pathophysiology and Allergy Research, Medical University of Vienna, Vienna, Austria
| | - Josef Thalhamer
- Department of Molecular Biology, Division of Allergy and Immunology, University of Salzburg, Salzburg, Austria
| | - Rudolf Valenta
- Division of Immunopathology, Department of Pathophysiology and Allergy Research, Medical University of Vienna, Vienna, Austria.
| | - Klaus Zangger
- Institute of Chemistry/Organic and Bioorganic Chemistry, University of Graz, Graz, Austria.
| | - Nico Tjandra
- Laboratory of Molecular Biophysics, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Md.
| |
Collapse
|
13
|
Magnet E, Stern C, Göbl C, Lipp-Pump A, Lang U, Cervar-Zivkovic M. Metformin versus Insulin in der Behandlung von Gestationsdiabetes – ein Vergleich der pharmakologischen Therapieformen. Geburtshilfe Frauenheilkd 2017. [DOI: 10.1055/s-0037-1602331] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
Affiliation(s)
- E Magnet
- Universitätsklinik für Frauenheilkunde und Geburtshilfe Graz
| | - C Stern
- Universitätsklinik für Frauenheilkunde und Geburtshilfe Graz
| | - C Göbl
- Universitätsklinik für Frauenheilkunde und Geburtshilfe Graz
| | - A Lipp-Pump
- Universitätsklinik für Frauenheilkunde und Geburtshilfe Graz
| | - U Lang
- Universitätsklinik für Frauenheilkunde und Geburtshilfe Graz
| | | |
Collapse
|
14
|
Kotzaeridi G, Falcone V, Rosicky I, Kiss H, Eppel W, Göbl C. Prediction of gestational diabetes at early pregnancy by using a clinical prediction model. Geburtshilfe Frauenheilkd 2017. [DOI: 10.1055/s-0037-1602328] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
Affiliation(s)
- G Kotzaeridi
- Metabolic Research Group, Division of Obstetrics and Feto-Maternal Medicine, Department of Obstetrics and Gynaecology, Medical University of Vienna
| | - V Falcone
- Metabolic Research Group, Division of Obstetrics and Feto-Maternal Medicine, Department of Obstetrics and Gynaecology, Medical University of Vienna
| | - I Rosicky
- Metabolic Research Group, Division of Obstetrics and Feto-Maternal Medicine, Department of Obstetrics and Gynaecology, Medical University of Vienna
| | - H Kiss
- Metabolic Research Group, Division of Obstetrics and Feto-Maternal Medicine, Department of Obstetrics and Gynaecology, Medical University of Vienna
| | - W Eppel
- Metabolic Research Group, Division of Obstetrics and Feto-Maternal Medicine, Department of Obstetrics and Gynaecology, Medical University of Vienna
| | - C Göbl
- Metabolic Research Group, Division of Obstetrics and Feto-Maternal Medicine, Department of Obstetrics and Gynaecology, Medical University of Vienna
| |
Collapse
|
15
|
Stopp T, Feichtinger M, Eppel W, Stulnig T, Husslein P, Göbl C. Pre- and Peripartal Management of a Woman with McArdle Disease: A Case Report and Literature Review. Geburtshilfe Frauenheilkd 2017. [DOI: 10.1055/s-0037-1602341] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
Affiliation(s)
- T Stopp
- Department of Gynecology and Obstetrics, Division of Obstetrics and Feto-maternal Medicine, Medical University of Vienna, Vienna, Austria
| | - M Feichtinger
- Department of Gynecology and Obstetrics, Division of Obstetrics and Feto-maternal Medicine, Medical University of Vienna, Vienna, Austria
| | - W Eppel
- Department of Gynecology and Obstetrics, Division of Obstetrics and Feto-maternal Medicine, Medical University of Vienna, Vienna, Austria
| | - T Stulnig
- Department of Medicine III, Clinical Division of Endocrinology and Metabolism, Medical University of Vienna, Vienna, Austria
| | - P Husslein
- Department of Gynecology and Obstetrics, Division of Obstetrics and Feto-maternal Medicine, Medical University of Vienna, Vienna, Austria
| | - C Göbl
- Department of Gynecology and Obstetrics, Division of Obstetrics and Feto-maternal Medicine, Medical University of Vienna, Vienna, Austria
| |
Collapse
|
16
|
Falcone V, Kiss H, Langer M, Husslein P, Göbl C. Innere Hernie und akut Sectio bei Schwangerschaft nach Magenbypass. Geburtshilfe Frauenheilkd 2017. [DOI: 10.1055/s-0037-1602319] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
Affiliation(s)
- V Falcone
- Metabolic Research Group Division of Obstetrics and Feto-Maternale Medicine, Department of Obstetrics and Gynaecology, Medical University Vienna
| | - H Kiss
- Metabolic Research Group Division of Obstetrics and Feto-Maternale Medicine, Department of Obstetrics and Gynaecology, Medical University Vienna
| | - M Langer
- Metabolic Research Group Division of Obstetrics and Feto-Maternale Medicine, Department of Obstetrics and Gynaecology, Medical University Vienna
| | - P Husslein
- Metabolic Research Group Division of Obstetrics and Feto-Maternale Medicine, Department of Obstetrics and Gynaecology, Medical University Vienna
| | - C Göbl
- Metabolic Research Group Division of Obstetrics and Feto-Maternale Medicine, Department of Obstetrics and Gynaecology, Medical University Vienna
| |
Collapse
|
17
|
Falcone V, Kotzaeridi G, Rosicky I, Kiss H, Eppel W, Göbl C. Development of GDM is characterized by impaired fasting insulin sensitivity and β-cell dysfunction at early gestation. Geburtshilfe Frauenheilkd 2017. [DOI: 10.1055/s-0037-1602318] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
Affiliation(s)
- V Falcone
- Metabolic Research Group Division of Obstetrics and Feto-Maternale Medicine, Department of Obstetrics and Gynaecology, Medical University Vienna
| | - G Kotzaeridi
- Metabolic Research Group Division of Obstetrics and Feto-Maternale Medicine, Department of Obstetrics and Gynaecology, Medical University Vienna
| | - I Rosicky
- Metabolic Research Group Division of Obstetrics and Feto-Maternale Medicine, Department of Obstetrics and Gynaecology, Medical University Vienna
| | - H Kiss
- Metabolic Research Group Division of Obstetrics and Feto-Maternale Medicine, Department of Obstetrics and Gynaecology, Medical University Vienna
| | - W Eppel
- Metabolic Research Group Division of Obstetrics and Feto-Maternale Medicine, Department of Obstetrics and Gynaecology, Medical University Vienna
| | - C Göbl
- Metabolic Research Group Division of Obstetrics and Feto-Maternale Medicine, Department of Obstetrics and Gynaecology, Medical University Vienna
| |
Collapse
|
18
|
Göbl C, Bozkurt L, Leutner M, Husslein P, Eppel W, Kautzky-Willer A. Auswirkung bariatrischer Chirurgie auf den Glukosestoffwechsel in der Schwangerschaft. Geburtshilfe Frauenheilkd 2017. [DOI: 10.1055/s-0037-1602323] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
Affiliation(s)
- C Göbl
- Abteilung für Geburtshilfe und Feto-maternale Medizin, Univ.-Klinik für Frauenheilkunde, Medizinische Universität Wien
| | - L Bozkurt
- Abteilung für Geburtshilfe und Feto-maternale Medizin, Univ.-Klinik für Frauenheilkunde, Medizinische Universität Wien
| | - M Leutner
- Abteilung für Geburtshilfe und Feto-maternale Medizin, Univ.-Klinik für Frauenheilkunde, Medizinische Universität Wien
| | - P Husslein
- Abteilung für Geburtshilfe und Feto-maternale Medizin, Univ.-Klinik für Frauenheilkunde, Medizinische Universität Wien
| | - W Eppel
- Abteilung für Geburtshilfe und Feto-maternale Medizin, Univ.-Klinik für Frauenheilkunde, Medizinische Universität Wien
| | - A Kautzky-Willer
- Abteilung für Geburtshilfe und Feto-maternale Medizin, Univ.-Klinik für Frauenheilkunde, Medizinische Universität Wien
| |
Collapse
|
19
|
Rodriguez Camargo DC, Tripsianes K, Buday K, Franko A, Göbl C, Hartlmüller C, Sarkar R, Aichler M, Mettenleiter G, Schulz M, Böddrich A, Erck C, Martens H, Walch AK, Madl T, Wanker EE, Conrad M, de Angelis MH, Reif B. The redox environment triggers conformational changes and aggregation of hIAPP in Type II Diabetes. Sci Rep 2017; 7:44041. [PMID: 28287098 PMCID: PMC5347123 DOI: 10.1038/srep44041] [Citation(s) in RCA: 67] [Impact Index Per Article: 9.6] [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: 09/23/2016] [Accepted: 02/03/2017] [Indexed: 12/22/2022] Open
Abstract
Type II diabetes (T2D) is characterized by diminished insulin production and resistance of cells to insulin. Among others, endoplasmic reticulum (ER) stress is a principal factor contributing to T2D and induces a shift towards a more reducing cellular environment. At the same time, peripheral insulin resistance triggers the over-production of regulatory hormones such as insulin and human islet amyloid polypeptide (hIAPP). We show that the differential aggregation of reduced and oxidized hIAPP assists to maintain the redox equilibrium by restoring redox equivalents. Aggregation thus induces redox balancing which can assist initially to counteract ER stress. Failure of the protein degradation machinery might finally result in β-cell disruption and cell death. We further present a structural characterization of hIAPP in solution, demonstrating that the N-terminus of the oxidized peptide has a high propensity to form an α-helical structure which is lacking in the reduced state of hIAPP. In healthy cells, this residual structure prevents the conversion into amyloidogenic aggregates.
Collapse
Affiliation(s)
- Diana C Rodriguez Camargo
- Helmholtz Zentrum München, Ingolstädter Landstr. 1, Neuherberg 85764, Germany.,Munich Center for Integrated Protein Science (CIPS-M) at Department Chemie, Technische Universität München (TUM), Germany
| | - Konstantinos Tripsianes
- Central European Institute of Technology (CEITEC), Masaryk University, Kamenice 5, Brno 62500, Czech Republic
| | - Katalin Buday
- Helmholtz Zentrum München, Ingolstädter Landstr. 1, Neuherberg 85764, Germany
| | - Andras Franko
- Helmholtz Zentrum München, Ingolstädter Landstr. 1, Neuherberg 85764, Germany.,German Center for Diabetes Research (DZD e.V.), Neuherberg 85764, Germany
| | - Christoph Göbl
- Helmholtz Zentrum München, Ingolstädter Landstr. 1, Neuherberg 85764, Germany.,Munich Center for Integrated Protein Science (CIPS-M) at Department Chemie, Technische Universität München (TUM), Germany
| | - Christoph Hartlmüller
- Munich Center for Integrated Protein Science (CIPS-M) at Department Chemie, Technische Universität München (TUM), Germany
| | - Riddhiman Sarkar
- Helmholtz Zentrum München, Ingolstädter Landstr. 1, Neuherberg 85764, Germany.,Munich Center for Integrated Protein Science (CIPS-M) at Department Chemie, Technische Universität München (TUM), Germany
| | - Michaela Aichler
- Helmholtz Zentrum München, Ingolstädter Landstr. 1, Neuherberg 85764, Germany
| | | | - Michael Schulz
- Helmholtz Zentrum München, Ingolstädter Landstr. 1, Neuherberg 85764, Germany
| | - Annett Böddrich
- Max-Delbrück-Center Berlin (MDC), Robert-Rössle-Str. 10, Berlin 13125, Germany
| | - Christian Erck
- Synaptic Systems GmbH, Rudolf-Wissell-Straße 28, Göttingen, 37079, Germany
| | - Henrik Martens
- Synaptic Systems GmbH, Rudolf-Wissell-Straße 28, Göttingen, 37079, Germany
| | - Axel Karl Walch
- Helmholtz Zentrum München, Ingolstädter Landstr. 1, Neuherberg 85764, Germany
| | - Tobias Madl
- Helmholtz Zentrum München, Ingolstädter Landstr. 1, Neuherberg 85764, Germany.,Munich Center for Integrated Protein Science (CIPS-M) at Department Chemie, Technische Universität München (TUM), Germany.,Institute of Molecular Biology &Biochemistry, Center of Molecular Medicine, Medical University of Graz, Austria
| | - Erich E Wanker
- Max-Delbrück-Center Berlin (MDC), Robert-Rössle-Str. 10, Berlin 13125, Germany
| | - Marcus Conrad
- Helmholtz Zentrum München, Ingolstädter Landstr. 1, Neuherberg 85764, Germany
| | - Martin Hrabě de Angelis
- Helmholtz Zentrum München, Ingolstädter Landstr. 1, Neuherberg 85764, Germany.,German Center for Diabetes Research (DZD e.V.), Neuherberg 85764, Germany.,Technische Universität München, Center of Life and Food Sciences Weihenstephan, Freising 85354, Germany
| | - Bernd Reif
- Helmholtz Zentrum München, Ingolstädter Landstr. 1, Neuherberg 85764, Germany.,Munich Center for Integrated Protein Science (CIPS-M) at Department Chemie, Technische Universität München (TUM), Germany
| |
Collapse
|
20
|
Gourinchas G, Etzl S, Göbl C, Vide U, Madl T, Winkler A. Long-range allosteric signaling in red light-regulated diguanylyl cyclases. Sci Adv 2017; 3:e1602498. [PMID: 28275738 PMCID: PMC5336353 DOI: 10.1126/sciadv.1602498] [Citation(s) in RCA: 57] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2016] [Accepted: 01/10/2017] [Indexed: 05/06/2023]
Abstract
Nature has evolved an astonishingly modular architecture of covalently linked protein domains with diverse functionalities to enable complex cellular networks that are critical for cell survival. The coupling of sensory modules with enzymatic effectors allows direct allosteric regulation of cellular signaling molecules in response to diverse stimuli. We present molecular details of red light-sensing bacteriophytochromes linked to cyclic dimeric guanosine monophosphate-producing diguanylyl cyclases. Elucidation of the first crystal structure of a full-length phytochrome with its enzymatic effector, in combination with the characterization of light-induced changes in conformational dynamics, reveals how allosteric light regulation is fine-tuned by the architecture and composition of the coiled-coil sensor-effector linker and also the central helical spine. We anticipate that consideration of molecular principles of sensor-effector coupling, going beyond the length of the characteristic linker, and the appreciation of dynamically driven allostery will open up new directions for the design of novel red light-regulated optogenetic tools.
Collapse
Affiliation(s)
- Geoffrey Gourinchas
- Institute of Biochemistry, Graz University of Technology, Petersgasse 12/II, 8010 Graz, Austria
| | - Stefan Etzl
- Institute of Biochemistry, Graz University of Technology, Petersgasse 12/II, 8010 Graz, Austria
| | - Christoph Göbl
- Center for Integrated Protein Science Munich, Technische Universität München, Department of Chemistry, Lichtenbergstraße 4, 85748 Garching, Germany
- Institute of Structural Biology, Helmholtz Zentrum München, Ingolstädter Landstraße 1, 85764 Neuherberg, Germany
| | - Uršula Vide
- Institute of Biochemistry, Graz University of Technology, Petersgasse 12/II, 8010 Graz, Austria
| | - Tobias Madl
- Center for Integrated Protein Science Munich, Technische Universität München, Department of Chemistry, Lichtenbergstraße 4, 85748 Garching, Germany
- Institute of Structural Biology, Helmholtz Zentrum München, Ingolstädter Landstraße 1, 85764 Neuherberg, Germany
- Institute of Molecular Biology and Biochemistry, Medical University of Graz, Harrachgasse 21/III, 8010 Graz, Austria
| | - Andreas Winkler
- Institute of Biochemistry, Graz University of Technology, Petersgasse 12/II, 8010 Graz, Austria
- Corresponding author.
| |
Collapse
|
21
|
Göbl C, Resch M, Strickland M, Hartlmüller C, Viertler M, Tjandra N, Madl T. Verbesserung der Dispersion der chemischen Verschiebungen von unstrukturierten Proteinen durch einen kovalent gebundenen Lanthanoidkomplex. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201607261] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Christoph Göbl
- Center for Integrated Protein Science Munich; Technische Universität München; Fakultät für Chemie; Lichtenbergstraße 4 85748 Garching Deutschland
- Institut für Strukturbiologie; Helmholtz Zentrum München; Ingolstädter Landstr. 1 85764 Neuherberg Deutschland
| | - Moritz Resch
- Center for Integrated Protein Science Munich; Technische Universität München; Fakultät für Chemie; Lichtenbergstraße 4 85748 Garching Deutschland
- Institut für Strukturbiologie; Helmholtz Zentrum München; Ingolstädter Landstr. 1 85764 Neuherberg Deutschland
| | - Madeleine Strickland
- Laboratory of Structural Biophysics Biochemistry and Biophysics Center; National Heart, Lung, and Blood Institute; National Institutes of Health; Building 50 Bethesda MD 20814 USA
| | - Christoph Hartlmüller
- Center for Integrated Protein Science Munich; Technische Universität München; Fakultät für Chemie; Lichtenbergstraße 4 85748 Garching Deutschland
- Institut für Strukturbiologie; Helmholtz Zentrum München; Ingolstädter Landstr. 1 85764 Neuherberg Deutschland
| | - Martin Viertler
- Institut für Strukturbiologie; Helmholtz Zentrum München; Ingolstädter Landstr. 1 85764 Neuherberg Deutschland
| | - Nico Tjandra
- Laboratory of Structural Biophysics Biochemistry and Biophysics Center; National Heart, Lung, and Blood Institute; National Institutes of Health; Building 50 Bethesda MD 20814 USA
| | - Tobias Madl
- Center for Integrated Protein Science Munich; Technische Universität München; Fakultät für Chemie; Lichtenbergstraße 4 85748 Garching Deutschland
- Institut für Strukturbiologie; Helmholtz Zentrum München; Ingolstädter Landstr. 1 85764 Neuherberg Deutschland
- Institut für Molekularbiologie & Biochemie; Zentrum für Medizinische Forschung; Medizinische Universität Graz; 8010 Graz Österreich
| |
Collapse
|
22
|
Göbl C, Resch M, Strickland M, Hartlmüller C, Viertler M, Tjandra N, Madl T. Increasing the Chemical-Shift Dispersion of Unstructured Proteins with a Covalent Lanthanide Shift Reagent. Angew Chem Int Ed Engl 2016; 55:14847-14851. [PMID: 27763708 PMCID: PMC5146990 DOI: 10.1002/anie.201607261] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [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: 07/27/2016] [Revised: 09/16/2016] [Indexed: 01/19/2023]
Abstract
The study of intrinsically disordered proteins (IDPs) by NMR often suffers from highly overlapped resonances that prevent unambiguous chemical-shift assignments, and data analysis that relies on well-separated resonances. We present a covalent paramagnetic lanthanide-binding tag (LBT) for increasing the chemical-shift dispersion and facilitating the chemical-shift assignment of challenging, repeat-containing IDPs. Linkage of the DOTA-based LBT to a cysteine residue induces pseudo-contact shifts (PCS) for resonances more than 20 residues from the spin-labeling site. This leads to increased chemical-shift dispersion and decreased signal overlap, thereby greatly facilitating chemical-shift assignment. This approach is applicable to IDPs of varying sizes and complexity, and is particularly helpful for repeat-containing IDPs and low-complexity regions. This results in improved efficiency for IDP analysis and binding studies.
Collapse
Affiliation(s)
- Christoph Göbl
- Center for Integrated Protein Science Munich, Technische Universität München, Department of Chemistry, Lichtenbergstraße 4, 85748, Garching, Germany.,Institute of Structural Biology, Helmholtz Zentrum München, Ingolstädter Landstr. 1, 85764, Neuherberg, Germany
| | - Moritz Resch
- Center for Integrated Protein Science Munich, Technische Universität München, Department of Chemistry, Lichtenbergstraße 4, 85748, Garching, Germany.,Institute of Structural Biology, Helmholtz Zentrum München, Ingolstädter Landstr. 1, 85764, Neuherberg, Germany
| | - Madeleine Strickland
- Laboratory of Structural Biophysics Biochemistry and Biophysics Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Building 50, Bethesda, MD, 20814, USA
| | - Christoph Hartlmüller
- Center for Integrated Protein Science Munich, Technische Universität München, Department of Chemistry, Lichtenbergstraße 4, 85748, Garching, Germany.,Institute of Structural Biology, Helmholtz Zentrum München, Ingolstädter Landstr. 1, 85764, Neuherberg, Germany
| | - Martin Viertler
- Institute of Structural Biology, Helmholtz Zentrum München, Ingolstädter Landstr. 1, 85764, Neuherberg, Germany
| | - Nico Tjandra
- Laboratory of Structural Biophysics Biochemistry and Biophysics Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Building 50, Bethesda, MD, 20814, USA
| | - Tobias Madl
- Center for Integrated Protein Science Munich, Technische Universität München, Department of Chemistry, Lichtenbergstraße 4, 85748, Garching, Germany.,Institute of Structural Biology, Helmholtz Zentrum München, Ingolstädter Landstr. 1, 85764, Neuherberg, Germany.,Institute of Molecular Biology & Biochemistry, Center of Molecular Medicine, Medical University of Graz, 8010, Graz, Austria
| |
Collapse
|
23
|
Strickland M, Schwieters CD, Göbl C, Opina ACL, Strub MP, Swenson RE, Vasalatiy O, Tjandra N. Characterizing the magnetic susceptibility tensor of lanthanide-containing polymethylated-DOTA complexes. J Biomol NMR 2016; 66:125-139. [PMID: 27659040 PMCID: PMC6628275 DOI: 10.1007/s10858-016-0061-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2016] [Accepted: 09/13/2016] [Indexed: 05/16/2023]
Abstract
Lanthanide complexes based on the DOTA (1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid) cage are commonly used as phase contrast agents in magnetic resonance imaging, but can also be utilized in structural NMR applications due to their ability to induce either paramagnetic relaxation enhancement or a pseudocontact shift (PCS) depending on the choice of the lanthanide. The size and sign of the PCS for any given atom is determined by its coordinates relative to the metal center, and the characteristics of the lanthanide's magnetic susceptibility tensor. Using a polymethylated DOTA tag (Ln-M8-SPy) conjugated to ubiquitin, we calculated the position of the metal center and characterized the susceptibility tensor for a number of lanthanides (dysprosium, thulium, and ytterbium) under a range of pH and temperature conditions. We found that there was a difference in temperature sensitivity for each of the complexes studied, which depended on the size of the lanthanide ion as well as the isomeric state of the cage. Using 17O-NMR, we confirmed that the temperature sensitivity of the compounds was enhanced by the presence of an apically bound water molecule. Since amide-containing lanthanide complexes are known to be pH sensitive and can be used as probes of physiological pH, we also investigated the effect of pH on the Ln-M8-SPy susceptibility tensor, but we found that the changes in this pH range (5.0-7.4) were not significant.
Collapse
Affiliation(s)
- Madeleine Strickland
- Laboratory of Molecular Biophysics, Biochemistry and Biophysics Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD, 20892, USA
| | - Charles D Schwieters
- Office of Intramural Research, Center for Information Technology, National Institutes of Health, Bethesda, MD, 20892, USA
| | - Christoph Göbl
- Department of Chemistry, Technische Universität München, Lichtenbergstraße 4, 85748, Garching, Germany
| | - Ana C L Opina
- Imaging Probe Development Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Rockville, MD, 20850, USA
| | - Marie-Paule Strub
- Laboratory of Molecular Biophysics, Biochemistry and Biophysics Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD, 20892, USA
| | - Rolf E Swenson
- Imaging Probe Development Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Rockville, MD, 20850, USA
| | - Olga Vasalatiy
- Imaging Probe Development Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Rockville, MD, 20850, USA
| | - Nico Tjandra
- Laboratory of Molecular Biophysics, Biochemistry and Biophysics Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD, 20892, USA.
| |
Collapse
|
24
|
Affiliation(s)
- Christoph Hartlmüller
- Center for Integrated Protein Science Munich Technische Universität München Department of Chemistry Lichtenbergstrasse 4 85748 Garching Germany
- Institute of Structural Biology Helmholtz Zentrum München Ingolstädter Landstrasse 1 85764 Neuherberg Germany
| | - Christoph Göbl
- Center for Integrated Protein Science Munich Technische Universität München Department of Chemistry Lichtenbergstrasse 4 85748 Garching Germany
- Institute of Structural Biology Helmholtz Zentrum München Ingolstädter Landstrasse 1 85764 Neuherberg Germany
| | - Tobias Madl
- Center for Integrated Protein Science Munich Technische Universität München Department of Chemistry Lichtenbergstrasse 4 85748 Garching Germany
- Institute of Structural Biology Helmholtz Zentrum München Ingolstädter Landstrasse 1 85764 Neuherberg Germany
- Institute of Molecular Biology & Biochemistry Center of Molecular Medicine Medical University of Graz 8010 Graz Austria
| |
Collapse
|
25
|
Abstract
An approach to the de novo structure prediction of proteins is described that relies on surface accessibility data from NMR paramagnetic relaxation enhancements by a soluble paramagnetic compound (sPRE). This method exploits the distance-to-surface information encoded in the sPRE data in the chemical shift-based CS-Rosetta de novo structure prediction framework to generate reliable structural models. For several proteins, it is demonstrated that surface accessibility data is an excellent measure of the correct protein fold in the early stages of the computational folding algorithm and significantly improves accuracy and convergence of the standard Rosetta structure prediction approach.
Collapse
Affiliation(s)
- Christoph Hartlmüller
- Center for Integrated Protein Science Munich, Technische Universität München, Department of Chemistry, Lichtenbergstrasse 4, 85748, Garching, Germany.,Institute of Structural Biology, Helmholtz Zentrum München, Ingolstädter Landstrasse 1, 85764, Neuherberg, Germany
| | - Christoph Göbl
- Center for Integrated Protein Science Munich, Technische Universität München, Department of Chemistry, Lichtenbergstrasse 4, 85748, Garching, Germany.,Institute of Structural Biology, Helmholtz Zentrum München, Ingolstädter Landstrasse 1, 85764, Neuherberg, Germany
| | - Tobias Madl
- Center for Integrated Protein Science Munich, Technische Universität München, Department of Chemistry, Lichtenbergstrasse 4, 85748, Garching, Germany. .,Institute of Structural Biology, Helmholtz Zentrum München, Ingolstädter Landstrasse 1, 85764, Neuherberg, Germany. .,Institute of Molecular Biology & Biochemistry, Center of Molecular Medicine, Medical University of Graz, 8010, Graz, Austria.
| |
Collapse
|
26
|
Göbl C, Ott J, Bozkurt L, Feichtinger M, Rehmann V, Cserjan A, Heinisch M, Steinbrecher H, Just-Kukurova I, Tuskova R, Leutner M, Vytiska-Binstorfer E, Kurz C, Weghofer A, Tura A, Egarter C, Kautzky-Willer A. To assess the association between glucose metabolism and ectopic lipid content in different clinical classifications of PCOS. DIABETOL STOFFWECHS 2016. [DOI: 10.1055/s-0036-1584116] [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: 10/21/2022]
|
27
|
Hacker C, Christ NA, Duchardt-Ferner E, Korn S, Göbl C, Berninger L, Düsterhus S, Hellmich UA, Madl T, Kötter P, Entian KD, Wöhnert J. The Solution Structure of the Lantibiotic Immunity Protein NisI and Its Interactions with Nisin. J Biol Chem 2015; 290:28869-86. [PMID: 26459561 PMCID: PMC4661402 DOI: 10.1074/jbc.m115.679969] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [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: 07/22/2015] [Revised: 09/25/2015] [Indexed: 12/21/2022] Open
Abstract
Many Gram-positive bacteria produce lantibiotics, genetically encoded and posttranslationally modified peptide antibiotics, which inhibit the growth of other Gram-positive bacteria. To protect themselves against their own lantibiotics these bacteria express a variety of immunity proteins including the LanI lipoproteins. The structural and mechanistic basis for LanI-mediated lantibiotic immunity is not yet understood. Lactococcus lactis produces the lantibiotic nisin, which is widely used as a food preservative. Its LanI protein NisI provides immunity against nisin but not against structurally very similar lantibiotics from other species such as subtilin from Bacillus subtilis. To understand the structural basis for LanI-mediated immunity and their specificity we investigated the structure of NisI. We found that NisI is a two-domain protein. Surprisingly, each of the two NisI domains has the same structure as the LanI protein from B. subtilis, SpaI, despite the lack of significant sequence homology. The two NisI domains and SpaI differ strongly in their surface properties and function. Additionally, SpaI-mediated lantibiotic immunity depends on the presence of a basic unstructured N-terminal region that tethers SpaI to the membrane. Such a region is absent from NisI. Instead, the N-terminal domain of NisI interacts with membranes but not with nisin. In contrast, the C-terminal domain specifically binds nisin and modulates the membrane affinity of the N-terminal domain. Thus, our results reveal an unexpected structural relationship between NisI and SpaI and shed light on the structural basis for LanI mediated lantibiotic immunity.
Collapse
Affiliation(s)
- Carolin Hacker
- From the Institute for Molecular Biosciences and the Center of Biomolecular Magnetic Resonance (BMRZ), Goethe University, 60438 Frankfurt am Main, Germany
| | - Nina A Christ
- From the Institute for Molecular Biosciences and the Center of Biomolecular Magnetic Resonance (BMRZ), Goethe University, 60438 Frankfurt am Main, Germany
| | - Elke Duchardt-Ferner
- From the Institute for Molecular Biosciences and the Center of Biomolecular Magnetic Resonance (BMRZ), Goethe University, 60438 Frankfurt am Main, Germany
| | - Sophie Korn
- From the Institute for Molecular Biosciences and
| | - Christoph Göbl
- the Department of Chemistry, Center for Integrated Protein Science Munich, Technical University München, Lichtenbergstraße 4, 85748 Garching, Germany, the Institute of Structural Biology, Helmholtz Zentrum München, 85764 Neuherberg, Germany
| | | | | | - Ute A Hellmich
- the Center of Biomolecular Magnetic Resonance (BMRZ), Goethe University, 60438 Frankfurt am Main, Germany, the Institute of Pharmacy and Biochemistry, Gutenberg University, 55128 Mainz, Germany
| | - Tobias Madl
- the Department of Chemistry, Center for Integrated Protein Science Munich, Technical University München, Lichtenbergstraße 4, 85748 Garching, Germany, the Institute of Structural Biology, Helmholtz Zentrum München, 85764 Neuherberg, Germany, the Institute of Molecular Biology & Biochemistry, Center of Molecular Medicine, Medical University of Graz, 8010 Graz, Austria, and the Omics Center Graz, BioTechMed Graz, 8010 Graz, Austria
| | - Peter Kötter
- From the Institute for Molecular Biosciences and
| | | | - Jens Wöhnert
- From the Institute for Molecular Biosciences and the Center of Biomolecular Magnetic Resonance (BMRZ), Goethe University, 60438 Frankfurt am Main, Germany,
| |
Collapse
|
28
|
Chromikova V, Mader A, Hofbauer S, Göbl C, Madl T, Gach JS, Bauernfried S, Furtmüller PG, Forthal DN, Mach L, Obinger C, Kunert R. Introduction of germline residues improves the stability of anti-HIV mAb 2G12-IgM. Biochim Biophys Acta 2015; 1854:1536-44. [PMID: 25748881 PMCID: PMC4582045 DOI: 10.1016/j.bbapap.2015.02.018] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/23/2014] [Revised: 02/16/2015] [Accepted: 02/24/2015] [Indexed: 11/02/2022]
Abstract
Immunoglobulins M (IgMs) are gaining increasing attention as biopharmaceuticals since their multivalent mode of binding can give rise to high avidity. Furthermore, IgMs are potent activators of the complement system. However, they are frequently difficult to express recombinantly and can suffer from low conformational stability. Here, the broadly neutralizing anti-HIV-1 antibody 2G12 was class-switched to IgM and then further engineered by introduction of 17 germline residues. The impact of these changes on the structure and conformational stability of the antibody was then assessed using a range of biophysical techniques. We also investigated the effects of the class switch and germline substitutions on the ligand-binding properties of 2G12 and its capacity for HIV-1 neutralization. Our results demonstrate that the introduced germline residues improve the conformational and thermal stability of 2G12-IgM without altering its overall shape and ligand-binding properties. Interestingly, the engineered protein was found to exhibit much lower neutralization potency than its wild-type counterpart, indicating that potent antigen recognition is not solely responsible for IgM-mediated HIV-1 inactivation.
Collapse
Affiliation(s)
- Veronika Chromikova
- Department of Biotechnology, Vienna Institute of BioTechnology at BOKU, University of Natural Resources and Life Sciences, Vienna, Austria
| | - Alexander Mader
- Department of Biotechnology, Vienna Institute of BioTechnology at BOKU, University of Natural Resources and Life Sciences, Vienna, Austria
| | - Stefan Hofbauer
- Department of Chemistry, Division of Biochemistry, Vienna Institute of BioTechnology at BOKU, University of Natural Resources and Life Sciences, Vienna, Austria; Department for Structural and Computational Biology, Max F. Perutz Laboratories, University of Vienna, Austria
| | - Christoph Göbl
- Center for Integrated Protein Science Munich at Chair of Biomolecular NMR Spectroscopy, Department of Chemistry, Technical University Munich, Garching, Germany; Institute of Structural Biology, Helmholtz Center Munich, Neuherberg, Germany
| | - Tobias Madl
- Center for Integrated Protein Science Munich at Chair of Biomolecular NMR Spectroscopy, Department of Chemistry, Technical University Munich, Garching, Germany; Institute of Structural Biology, Helmholtz Center Munich, Neuherberg, Germany; Institute of Molecular Biology and Biochemistry, Center of Molecular Medicine, Medical University of Graz, Austria
| | - Johannes S Gach
- Department of Medicine, Division of Infectious Diseases, University of CA, Irvine, USA
| | - Stefan Bauernfried
- Department of Biotechnology, Vienna Institute of BioTechnology at BOKU, University of Natural Resources and Life Sciences, Vienna, Austria
| | - Paul G Furtmüller
- Department of Chemistry, Division of Biochemistry, Vienna Institute of BioTechnology at BOKU, University of Natural Resources and Life Sciences, Vienna, Austria
| | - Donald N Forthal
- Department of Medicine, Division of Infectious Diseases, University of CA, Irvine, USA
| | - Lukas Mach
- Department of Applied Genetics and Cell Biology, Vienna Institute of BioTechnology at BOKU, University of Natural Resources and Life Sciences, Vienna, Austria
| | - Christian Obinger
- Department of Chemistry, Division of Biochemistry, Vienna Institute of BioTechnology at BOKU, University of Natural Resources and Life Sciences, Vienna, Austria.
| | - Renate Kunert
- Department of Biotechnology, Vienna Institute of BioTechnology at BOKU, University of Natural Resources and Life Sciences, Vienna, Austria.
| |
Collapse
|
29
|
Göbl C, Madl T, Simon B, Sattler M. NMR approaches for structural analysis of multidomain proteins and complexes in solution. Prog Nucl Magn Reson Spectrosc 2014; 80:26-63. [PMID: 24924266 DOI: 10.1016/j.pnmrs.2014.05.003] [Citation(s) in RCA: 130] [Impact Index Per Article: 13.0] [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: 02/21/2014] [Accepted: 05/14/2014] [Indexed: 05/22/2023]
Abstract
NMR spectroscopy is a key method for studying the structure and dynamics of (large) multidomain proteins and complexes in solution. It plays a unique role in integrated structural biology approaches as especially information about conformational dynamics can be readily obtained at residue resolution. Here, we review NMR techniques for such studies focusing on state-of-the-art tools and practical aspects. An efficient approach for determining the quaternary structure of multidomain complexes starts from the structures of individual domains or subunits. The arrangement of the domains/subunits within the complex is then defined based on NMR measurements that provide information about the domain interfaces combined with (long-range) distance and orientational restraints. Aspects discussed include sample preparation, specific isotope labeling and spin labeling; determination of binding interfaces and domain/subunit arrangements from chemical shift perturbations (CSP), nuclear Overhauser effects (NOEs), isotope editing/filtering, cross-saturation, and differential line broadening; and based on paramagnetic relaxation enhancements (PRE) using covalent and soluble spin labels. Finally, the utility of complementary methods such as small-angle X-ray or neutron scattering (SAXS, SANS), electron paramagnetic resonance (EPR) or fluorescence spectroscopy techniques is discussed. The applications of NMR techniques are illustrated with studies of challenging (high molecular weight) protein complexes.
Collapse
Affiliation(s)
- Christoph Göbl
- Biomolecular NMR and Center for Integrated Protein Science Munich at Department Chemie, Technische Universität München, Garching, Germany
| | - Tobias Madl
- Biomolecular NMR and Center for Integrated Protein Science Munich at Department Chemie, Technische Universität München, Garching, Germany; Institute of Structural Biology, Helmholtz Zentrum München, Neuherberg, Germany; Institute of Molecular Biology, University of Graz, Graz, Austria.
| | - Bernd Simon
- European Molecular Biology Laboratory, Structural and Computational Biology Unit, Meyerhofstraße 1, 69117 Heidelberg, Germany
| | - Michael Sattler
- Biomolecular NMR and Center for Integrated Protein Science Munich at Department Chemie, Technische Universität München, Garching, Germany; Institute of Structural Biology, Helmholtz Zentrum München, Neuherberg, Germany.
| |
Collapse
|
30
|
Stadler M, Krššák M, Jankovic D, Göbl C, Winhofer Y, Pacini G, Bischof M, Haidinger M, Saemann M, Mühlbacher F, Korbonits M, Baumgartner-Parzer SM, Luger A, Prager R, Anderwald CH, Krebs M. Fasting and postprandial liver glycogen content in patients with type 1 diabetes mellitus after successful pancreas-kidney transplantation with systemic venous insulin delivery. Clin Endocrinol (Oxf) 2014; 80:208-13. [PMID: 23302039 DOI: 10.1111/cen.12146] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/17/2012] [Revised: 12/04/2012] [Accepted: 01/07/2013] [Indexed: 11/29/2022]
Abstract
BACKGROUND In patients with type 1 diabetes mellitus (T1DM), insulin is usually replaced systemically (subcutaneously) and not via the physiological portal route. According to previous studies, the liver's capacity to store glycogen is reduced in T1DM patients, but it remains unclear whether this is due to hyperglycaemia, or whether the route of insulin supply could contribute to this phenomenon. T1DM patients after successful pancreas-kidney transplantation with systemic venous drainage (T1DM-PKT) represent a suitable human model to further investigate this question, because they are normoglycaemic, but their liver receives insulin from the pancreas transplant via the systemic route. MATERIALS AND METHODS In nine T1DM-PKT, nine controls without diabetes (CON) and seven patients with T1DM (T1DM), liver glycogen content was measured at fasting and after two standardized meals employing (13) C-nuclear-magnetic-resonance-spectroscopy. Circulating glucose and glucoregulatory hormones were measured repeatedly throughout the study day. RESULTS The mean and fasting concentrations of peripheral plasma glucose, insulin, glucagon and C-peptide were comparable between T1DM-PKT and CON, whereas T1DM were hyperglycaemic and hyperinsulinaemic (P < 0·05 vs T1DM-PKT and CON). Total liver glycogen content at fasting and after breakfast did not differ in the three groups. After lunch, T1DM-PKT and T1DM had a 14% and 21% lower total liver glycogen content than CON (P < 0·02). CONCLUSION In spite of normalized glycaemic control, postprandial liver glycogen content was reduced in T1DM-PKT with systemic venous drainage. Thus, not even optimized systemic insulin substitution is able to resolve the defect in postprandial liver glycogen storage seen in T1DM patients.
Collapse
Affiliation(s)
- M Stadler
- 3rd Medical Department of Metabolic Diseases and Nephrology, Hietzing Hospital, Vienna, Austria; Karl Landsteiner Institute of Metabolic Diseases and Nephrology, Vienna, Austria; Department of Endocrinology, William Harvey Research Institute, Barts and the London School of Medicine, Queen Mary University of London, London, UK
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
31
|
Kosol S, Schrank E, Krajačić MB, Wagner GE, Meyer NH, Göbl C, Rechberger GN, Zangger K, Novak P. Probing the Interactions of Macrolide Antibiotics with Membrane-Mimetics by NMR Spectroscopy. J Med Chem 2012; 55:5632-6. [DOI: 10.1021/jm300647f] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Simone Kosol
- Institute
of Chemistry/Organic
and Bioorganic Chemistry, University of Graz, Heinrichstrasse 28,
A-8010 Graz, Austria
| | - Evelyne Schrank
- Institute
of Chemistry/Organic
and Bioorganic Chemistry, University of Graz, Heinrichstrasse 28,
A-8010 Graz, Austria
| | | | - Gabriel E. Wagner
- Institute
of Chemistry/Organic
and Bioorganic Chemistry, University of Graz, Heinrichstrasse 28,
A-8010 Graz, Austria
| | - N. Helge Meyer
- Institute
of Chemistry/Organic
and Bioorganic Chemistry, University of Graz, Heinrichstrasse 28,
A-8010 Graz, Austria
| | - Christoph Göbl
- Institute
of Chemistry/Organic
and Bioorganic Chemistry, University of Graz, Heinrichstrasse 28,
A-8010 Graz, Austria
| | - Gerald N. Rechberger
- Institute of Molecular Biosciences,
University of Graz, Humboldtstrasse 50, A-8010 Graz, Austria
| | - Klaus Zangger
- Institute
of Chemistry/Organic
and Bioorganic Chemistry, University of Graz, Heinrichstrasse 28,
A-8010 Graz, Austria
| | - Predrag Novak
- Department of Chemistry, Faculty
of Natural Science, University of Zagreb, Laboratory for Analytical
Chemistry, Horvatovac 102a, HR-10000 Zagreb, Croatia
| |
Collapse
|
32
|
Krššák M, Winhofer Y, Göbl C, Bischof M, Reiter G, Kautzky-Willer A, Luger A, Krebs M, Anderwald C. Insulin resistance is not associated with myocardial steatosis in women. Diabetologia 2011; 54:1871-8. [PMID: 21491158 DOI: 10.1007/s00125-011-2146-0] [Citation(s) in RCA: 21] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/26/2010] [Accepted: 03/17/2011] [Indexed: 01/29/2023]
Abstract
AIMS/HYPOTHESIS Insulin resistance, an independent risk-factor for cardiovascular disease, precedes type 2 diabetes and is associated with ectopic lipid accumulation in skeletal muscle and liver. Recent evidence indicates that cardiac steatosis plays a central role in the development of diabetic cardiomyopathy. However, it is not known whether insulin resistance as such in the absence of type 2 diabetes is associated with heart steatosis and/or impaired function. We therefore assessed myocardial steatosis and myocardial function in a sample of women with normal insulin sensitivity, insulin resistance, impaired glucose tolerance (IGT) and type 2 diabetes. METHODS Magnetic resonance imaging and localised spectroscopy were used to measure left ventricular dynamic variables and myocardial lipid accumulation in interventricular septum of non-diabetic, age- and BMI-matched insulin-sensitive (n = 11, 47 ± 6 years, BMI 25 ± 2 kg/m(2); clamp-like index [CLIX] = 9.7 ± 0.7) and insulin-resistant (n = 10, 48 ± 5 years, 27 ± 4 kg/m(2); CLIX = 4.5 ± 0.4) women with normal glucose tolerance as well as of women with IGT (n = 6, 45 ± 5 years, 28 ± 6 kg/m(2); CLIX = 3.6 ± 1.1) and type 2 diabetes (n = 7, 52 ± 10 years, 27 ± 3 kg/m(2)). RESULTS Myocardial lipid content was increased in type 2 diabetic women only (insulin-sensitive 0.4 ± 0.2% [means ± SD]; insulin-resistant 0.4 ± 0.1%; IGT 0.5 ± 0.2%; type 2 diabetes 0.7 ± 0.3%; p < 0.05). In insulin-resistant and type 2 diabetic women, stroke volume was lower (-15% and -27%, respectively, vs insulin-sensitive) and heart rate was higher (11% and 14%, respectively, vs insulin-sensitive, p < 0.05). No other differences in systolic and diastolic function were observed between study groups. CONCLUSIONS/INTERPRETATION In contrast to liver and skeletal muscle, insulin resistance as such is not associated with increased myocardial lipid accumulation.
Collapse
Affiliation(s)
- M Krššák
- Division of Endocrinology and Metabolism, Department of Internal Medicine III, Medical University of Vienna, Währinger Gürtel 18-20, 1090 Wien, Austria
| | | | | | | | | | | | | | | | | |
Collapse
|
33
|
Abstract
![]()
The par toxin−antitoxin system is required for the stable inheritance of the plasmid pAD1 in its native host Enterococcus faecalis. It codes for the toxin Fst and a small antisense RNA which inhibits translation of toxin mRNA, and it is the only known antisense regulated toxin−antitoxin system in Gram-positive bacteria. This study presents the structure of the par toxin Fst, the first atomic resolution structure of a component of an antisense regulated toxin−antitoxin system. The mode of membrane binding was determined by relaxation enhancements in a paramagnetic environment and molecular dynamics simulation. Fst forms a membrane-binding α-helix in the N-terminal part and contains an intrinsically disordered region near the C-terminus. It binds in a transmembrane orientation with the C-terminus likely pointing toward the cytosol. Membrane-bound, α-helical peptides are frequently found in higher organisms as components of the innate immune system. Despite similarities to these antimicrobial peptides, Fst shows neither hemolytic nor antimicrobial activity when applied externally to a series of bacteria, fungal cells, and erythrocytes. Moreover, its charge distribution, orientation in the membrane, and structure distinguish it from antimicrobial peptides.
Collapse
Affiliation(s)
- Christoph Göbl
- Institute of Chemistry/Organic and Bioorganic Chemistry, University of Graz, Heinrichstrasse 28, A-8010 Graz, Austria
| | | | | | | | | |
Collapse
|
34
|
Göbl C, Dulle M, Hohlweg W, Grossauer J, Falsone SF, Glatter O, Zangger K. Influence of phosphocholine alkyl chain length on peptide-micelle interactions and micellar size and shape. J Phys Chem B 2010; 114:4717-24. [PMID: 20225847 DOI: 10.1021/jp9114089] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The interaction with biological membranes is of functional importance for many peptides and proteins. Structural studies on such membrane-bound biomacromolecules are often carried out in solutions containing small membrane-mimetic assemblies of detergent molecules. To investigate the influence of the hydrophobic chain length on the structure, diffusional and dynamical behavior of a peptide bound to micelles, we studied the binding of three peptides to n-phosphocholines with n ranging from 8 to 16. The peptides studied are the 15 residue antimicrobial peptide CM15, the 25-residue transmembrane helix 7 of yeast V-ATPase (TM7), and the 35-residue bacterial toxin LdrD. To keep the dimension of the peptide-membrane-mimetic assembly small, micelles are typically used when studying membrane-bound peptides and proteins, for example, by solution NMR spectroscopy. Since they are readily available in deuterated form most often sodium-dodecylsulfate (SDS) and dodecylphosphocholine (DPC) are used as the micelle-forming detergent. Using NMR, CD, and SAXS, we found that all phosphocholines studied form spherical micelles in the presence and absence of small bound peptides and the diameters of the micelles are basically unchanged upon peptide binding. The size of the peptide relative to the micelle determines to what extent the secondary structure can form. For small peptides (up to approximately 25 residues) the use of shorter chain phosphocholines is recommended for solution NMR studies due to the favorable spectral quality and since they are as well-structured as in DPC. In contrast, larger peptides are better structured in micelles formed by detergents with chain lengths longer than DPC.
Collapse
Affiliation(s)
- Christoph Göbl
- Department of Chemistry/Organic and Bioorganic Chemistry, University of Graz Heinrichstrasse 28, A-8010 Graz, Austria
| | | | | | | | | | | | | |
Collapse
|
35
|
Zangger K, Respondek M, Göbl C, Hohlweg W, Rasmussen K, Grampp G, Madl T. Positioning of micelle-bound peptides by paramagnetic relaxation enhancements. J Phys Chem B 2009; 113:4400-6. [PMID: 19256533 DOI: 10.1021/jp808501x] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Many peptides, proteins, and drugs interact with biological membranes, and knowing the mode of binding is essential to understanding their biological functions. To obtain the complete orientation and immersion depth of such a compound, the membrane-mimetic system (micelle) is placed in an aqueous buffer containing the soluble and inert paramagnetic contrast agent Gd(DTPA-BMA). Paramagnetic relaxation enhancements (PREs) of a specific nucleus then depend only on its distance from the surface. The positioning of a structurally characterized compound can be obtained by least-squares fitting of experimental PREs to the micelle center position. This liquid-state NMR approach, which does not rely on isotopic labeling or chemical modification, has been applied to determine the location of the presumed transmembrane region 7 of yeast V-ATPase (TM7) and the membrane-bound antimicrobial peptide CM15 in micelles. TM7 binds in a trans-micelle orientation with the N-terminus being slightly closer to the surface than the C-terminus. CM15 is immersed unexpectedly deep into the micelle with the more hydrophilic side of the helix being closer to the surface than the hydrophobic one.
Collapse
Affiliation(s)
- Klaus Zangger
- Institute of Chemistry/Organic and Bioorganic Chemistry, University of Graz, Austria.
| | | | | | | | | | | | | |
Collapse
|
36
|
Respondek M, Madl T, Göbl C, Golser R, Zangger K. Mapping the orientation of helices in micelle-bound peptides by paramagnetic relaxation waves. J Am Chem Soc 2007; 129:5228-34. [PMID: 17397158 DOI: 10.1021/ja069004f] [Citation(s) in RCA: 106] [Impact Index Per Article: 6.2] [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] [Indexed: 11/29/2022]
Abstract
Many antimicrobial peptides form alpha-helices when bound to a membrane. In addition, around 80% of residues in membrane-bound proteins are found in alpha-helical regions. The orientation and location of such helical peptides and proteins in the membrane are key factors determining their function and activity. Here we present a new solution state NMR method for obtaining the orientation of helical peptides in a membrane-mimetic environment (micelle-bound) without any chemical perturbation of the peptide-micelle system. By monitoring proton longitudinal relaxation rates upon addition of the freely water-soluble and inert paramagnetic probe Gd(DTPA-BMA) to an alpha-helical peptide, a wavelike pattern with a periodicity of 3.6 residues per turn is observed. The tilt and azimuth (rotation) angle of the helix determine the shape of this paramagnetic relaxation wave and can be obtained by least-square fitting of measured relaxation enhancements. Results are presented for the 15-residue antimicrobial peptide CM15 which forms an amphipathic helix almost parallel to the surface of the micelle. Thus, a few fast experiments enable the identification of helical regions and determination of the helix orientation within the micelle without the need for covalent modification, isotopic labeling, or sophisticated equipment. This approach opens a path toward the topology determination of alpha-helical membrane-proteins without the need for a complete NOE-based structure determination.
Collapse
Affiliation(s)
- Michal Respondek
- Institute of Chemistry/Organic and Bioorganic Chemistry, University of Graz, Heinrichstrasse 28, A-8010 Graz, Austria
| | | | | | | | | |
Collapse
|