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Beaudoin CA, Petsolari E, Hamaia SW, Hala S, Alofi FS, Pandurangan AP, Blundell TL, Chaitanya Vedithi S, Huang CLH, Jackson AP. SARS-CoV-2 Omicron subvariant spike N405 unlikely to rapidly deamidate. Biochem Biophys Res Commun 2023; 666:61-67. [PMID: 37178506 PMCID: PMC10152834 DOI: 10.1016/j.bbrc.2023.04.088] [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: 04/04/2023] [Accepted: 04/24/2023] [Indexed: 05/15/2023]
Abstract
The RGD motif on the SARS-CoV-2 spike protein has been suggested to interact with RGD-binding integrins αVβ3 and α5β1 to enhance viral cell entry and alter downstream signaling cascades. The D405N mutation on the Omicron subvariant spike proteins, resulting in an RGN motif, has recently been shown to inhibit binding to integrin αVβ3. Deamidation of asparagines in protein ligand RGN motifs has been demonstrated to generate RGD and RGisoD motifs that permit binding to RGD-binding integrins. Two asparagines, N481 and N501, on the Wild-type spike receptor-binding domain have been previously shown to have deamidation half-lives of 16.5 and 123 days, respectively, which may occur during the viral life cycle. Deamidation of Omicron subvariant N405 may recover the ability to interact with RGD-binding integrins. Thus, herein, all-atom molecular dynamics simulations of the Wild-type and Omicron subvariant spike protein receptor-binding domains were conducted to investigate the potential for asparagines, the Omicron subvariant N405 in particular, to assume the optimized geometry for deamidation to occur. In summary, the Omicron subvariant N405 was primarily found to be stabilized in a state unfavourable for deamidation after hydrogen bonding with downstream E406. Nevertheless, a small number of RGD or RGisoD motifs on the Omicron subvariant spike proteins may restore the ability to interact with RGD-binding integrins. The simulations also provided structural clarification regarding the deamidation rates of Wild-type N481 and N501 and highlighted the utility of tertiary structure dynamics information in predicting asparagine deamidation. Further work is needed to characterize the effects of deamidation on spike-integrin interactions.
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Affiliation(s)
- Christopher A Beaudoin
- Department of Biochemistry, Hopkins Building, University of Cambridge, Tennis Court Road, Cambridge, CB2 1QW, United Kingdom.
| | - Emmanouela Petsolari
- Department of Biochemistry, Sanger Building, University of Cambridge, Tennis Court Road, Cambridge, CB2 1GA, United Kingdom
| | - Samir W Hamaia
- Department of Biochemistry, Hopkins Building, University of Cambridge, Tennis Court Road, Cambridge, CB2 1QW, United Kingdom
| | - Sharif Hala
- Infectious Disease Research Department, King Abdullah International Medical Research Centre, Ministry of National Guard Health Affairs, Jeddah, Saudi Arabia; King Saud Bin Abdulaziz University for Health Sciences, Ministry of National Guard Health Affairs, Jeddah, Saudi Arabia
| | - Fadwa S Alofi
- Infectious Disease Research Department, King Abdullah International Medical Research Centre, Ministry of National Guard Health Affairs, Jeddah, Saudi Arabia
| | - Arun P Pandurangan
- Heart and Lung Research Institute, University of Cambridge, Papworth Road, Cambridge, CB2 0BB, United Kingdom
| | - Tom L Blundell
- Heart and Lung Research Institute, University of Cambridge, Papworth Road, Cambridge, CB2 0BB, United Kingdom
| | - Sundeep Chaitanya Vedithi
- Heart and Lung Research Institute, University of Cambridge, Papworth Road, Cambridge, CB2 0BB, United Kingdom
| | - Christopher L-H Huang
- Department of Biochemistry, Hopkins Building, University of Cambridge, Tennis Court Road, Cambridge, CB2 1QW, United Kingdom; Physiological Laboratory, University of Cambridge, Downing Street, Cambridge, CB2 3EG, United Kingdom
| | - Antony P Jackson
- Department of Biochemistry, Hopkins Building, University of Cambridge, Tennis Court Road, Cambridge, CB2 1QW, United Kingdom.
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2
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Beaudoin CA, Pandurangan AP, Kim SY, Hamaia SW, Huang CL, Blundell TL, Vedithi SC, Jackson AP. In silico analysis of mutations near S1/S2 cleavage site in SARS-CoV-2 spike protein reveals increased propensity of glycosylation in Omicron strain. J Med Virol 2022; 94:4181-4192. [PMID: 35575289 PMCID: PMC9348480 DOI: 10.1002/jmv.27845] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2022] [Revised: 05/03/2022] [Accepted: 05/05/2022] [Indexed: 11/06/2022]
Abstract
Cleavage of the severe respiratory syndrome coronavirus-2 (SARS-CoV-2) spike protein has been demonstrated to contribute to viral-cell fusion and syncytia formation. Studies have shown that variants of concern (VOC) and variants of interest (VOI) show differing membrane fusion capacity. Mutations near cleavage motifs, such as the S1/S2 and S2' sites, may alter interactions with host proteases and, thus, the potential for fusion. The biochemical basis for the differences in interactions with host proteases for the VOC/VOI spike proteins has not yet been explored. Using sequence and structure-based bioinformatics, mutations near the VOC/VOI spike protein cleavage sites were inspected for their structural effects. All mutations found at the S1/S2 sites were predicted to increase affinity to the furin protease but not TMPRSS2. Mutations at the spike residue P681 in several strains, such P681R in the Delta strain, resulted in the disruption of a proline-directed kinase phosphorylation motif at the S1/S2 site, which may lessen the impact of phosphorylation for these variants. However, the unique N679K mutation in the Omicron strain was found to increase the propensity for O-linked glycosylation at the S1/S2 cleavage site, which may prevent recognition by proteases. Such glycosylation in the Omicron strain may hinder entry at the cell surface and, thus, decrease syncytia formation and induce cell entry through the endocytic pathway as has been shown in previous studies. Further experimental work is needed to confirm the effect of mutations and posttranslational modifications on SARS-CoV-2 spike protein cleavage sites.
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Affiliation(s)
| | - Arun P. Pandurangan
- Department of Biochemistry, Sanger BuildingUniversity of CambridgeCambridgeUnited Kingdom
| | - So Yeon Kim
- Department of Biochemistry, Sanger BuildingUniversity of CambridgeCambridgeUnited Kingdom
| | - Samir W. Hamaia
- Department of Biochemistry, Hopkins BuildingUniversity of CambridgeCambridgeUnited Kingdom
| | - Christopher L.‐H. Huang
- Department of Biochemistry, Hopkins BuildingUniversity of CambridgeCambridgeUnited Kingdom
- Physiological LaboratoryUniversity of CambridgeCambridgeUnited Kingdom
| | - Tom L. Blundell
- Department of Biochemistry, Sanger BuildingUniversity of CambridgeCambridgeUnited Kingdom
| | | | - Antony P. Jackson
- Department of Biochemistry, Hopkins BuildingUniversity of CambridgeCambridgeUnited Kingdom
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3
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Blum M, Chang HY, Chuguransky S, Grego T, Kandasaamy S, Mitchell A, Nuka G, Paysan-Lafosse T, Qureshi M, Raj S, Richardson L, Salazar GA, Williams L, Bork P, Bridge A, Gough J, Haft DH, Letunic I, Marchler-Bauer A, Mi H, Natale DA, Necci M, Orengo CA, Pandurangan AP, Rivoire C, Sigrist CJA, Sillitoe I, Thanki N, Thomas PD, Tosatto SCE, Wu CH, Bateman A, Finn RD. The InterPro protein families and domains database: 20 years on. Nucleic Acids Res 2021; 49:D344-D354. [PMID: 33156333 PMCID: PMC7778928 DOI: 10.1093/nar/gkaa977] [Citation(s) in RCA: 1031] [Impact Index Per Article: 343.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2020] [Revised: 10/08/2020] [Accepted: 10/23/2020] [Indexed: 01/22/2023] Open
Abstract
The InterPro database (https://www.ebi.ac.uk/interpro/) provides an integrative classification of protein sequences into families, and identifies functionally important domains and conserved sites. InterProScan is the underlying software that allows protein and nucleic acid sequences to be searched against InterPro's signatures. Signatures are predictive models which describe protein families, domains or sites, and are provided by multiple databases. InterPro combines signatures representing equivalent families, domains or sites, and provides additional information such as descriptions, literature references and Gene Ontology (GO) terms, to produce a comprehensive resource for protein classification. Founded in 1999, InterPro has become one of the most widely used resources for protein family annotation. Here, we report the status of InterPro (version 81.0) in its 20th year of operation, and its associated software, including updates to database content, the release of a new website and REST API, and performance improvements in InterProScan.
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Affiliation(s)
- Matthias Blum
- European Molecular Biology Laboratory, European Bioinformatics Institute (EMBL-EBI), Wellcome Genome Campus, Hinxton, Cambridgeshire CB10 1SD, UK
| | - Hsin-Yu Chang
- European Molecular Biology Laboratory, European Bioinformatics Institute (EMBL-EBI), Wellcome Genome Campus, Hinxton, Cambridgeshire CB10 1SD, UK
| | - Sara Chuguransky
- European Molecular Biology Laboratory, European Bioinformatics Institute (EMBL-EBI), Wellcome Genome Campus, Hinxton, Cambridgeshire CB10 1SD, UK
| | - Tiago Grego
- European Molecular Biology Laboratory, European Bioinformatics Institute (EMBL-EBI), Wellcome Genome Campus, Hinxton, Cambridgeshire CB10 1SD, UK
| | - Swaathi Kandasaamy
- European Molecular Biology Laboratory, European Bioinformatics Institute (EMBL-EBI), Wellcome Genome Campus, Hinxton, Cambridgeshire CB10 1SD, UK
| | - Alex Mitchell
- European Molecular Biology Laboratory, European Bioinformatics Institute (EMBL-EBI), Wellcome Genome Campus, Hinxton, Cambridgeshire CB10 1SD, UK
| | - Gift Nuka
- European Molecular Biology Laboratory, European Bioinformatics Institute (EMBL-EBI), Wellcome Genome Campus, Hinxton, Cambridgeshire CB10 1SD, UK
| | - Typhaine Paysan-Lafosse
- European Molecular Biology Laboratory, European Bioinformatics Institute (EMBL-EBI), Wellcome Genome Campus, Hinxton, Cambridgeshire CB10 1SD, UK
| | - Matloob Qureshi
- European Molecular Biology Laboratory, European Bioinformatics Institute (EMBL-EBI), Wellcome Genome Campus, Hinxton, Cambridgeshire CB10 1SD, UK
| | - Shriya Raj
- European Molecular Biology Laboratory, European Bioinformatics Institute (EMBL-EBI), Wellcome Genome Campus, Hinxton, Cambridgeshire CB10 1SD, UK
| | - Lorna Richardson
- European Molecular Biology Laboratory, European Bioinformatics Institute (EMBL-EBI), Wellcome Genome Campus, Hinxton, Cambridgeshire CB10 1SD, UK
| | - Gustavo A Salazar
- European Molecular Biology Laboratory, European Bioinformatics Institute (EMBL-EBI), Wellcome Genome Campus, Hinxton, Cambridgeshire CB10 1SD, UK
| | - Lowri Williams
- European Molecular Biology Laboratory, European Bioinformatics Institute (EMBL-EBI), Wellcome Genome Campus, Hinxton, Cambridgeshire CB10 1SD, UK
| | - Peer Bork
- European Molecular Biology Laboratory, Structural and Computational Biology Unit, Meyerhofstraße 1, 69117 Heidelberg, Germany
| | - Alan Bridge
- Swiss-Prot Group, Swiss Institute of Bioinformatics, CMU, 1 rue Michel Servet, CH-1211, Geneva 4, Switzerland
| | - Julian Gough
- Medical Research Council Laboratory of Molecular Biology, Cambridge Biomedical Campus, Francis Crick Ave, Trumpington, Cambridge CB2 0QH, UK
| | - Daniel H Haft
- National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, 8600 Rockville Pike, Bethesda MD 20894 USA
| | - Ivica Letunic
- Biobyte Solutions GmbH, Bothestr 142, 69126 Heidelberg, Germany
| | - Aron Marchler-Bauer
- National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, 8600 Rockville Pike, Bethesda MD 20894 USA
| | - Huaiyu Mi
- Division of Bioinformatics, Department of Preventive Medicine, University of Southern California, Los Angeles, CA 90033, USA
| | - Darren A Natale
- Protein Information Resource, Georgetown University Medical Center, Washington, DC 20007, USA
| | - Marco Necci
- Department of Biomedical Sciences, University of Padua, via U. Bassi 58/b, 35131 Padua, Italy
| | - Christine A Orengo
- Department of Structural and Molecular Biology, University College London, Gower St, Bloomsbury, London WC1E 6BT, UK
| | - Arun P Pandurangan
- Medical Research Council Laboratory of Molecular Biology, Cambridge Biomedical Campus, Francis Crick Ave, Trumpington, Cambridge CB2 0QH, UK
| | - Catherine Rivoire
- Swiss-Prot Group, Swiss Institute of Bioinformatics, CMU, 1 rue Michel Servet, CH-1211, Geneva 4, Switzerland
| | - Christian J A Sigrist
- Swiss-Prot Group, Swiss Institute of Bioinformatics, CMU, 1 rue Michel Servet, CH-1211, Geneva 4, Switzerland
| | - Ian Sillitoe
- Department of Structural and Molecular Biology, University College London, Gower St, Bloomsbury, London WC1E 6BT, UK
| | - Narmada Thanki
- National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, 8600 Rockville Pike, Bethesda MD 20894 USA
| | - Paul D Thomas
- Division of Bioinformatics, Department of Preventive Medicine, University of Southern California, Los Angeles, CA 90033, USA
| | - Silvio C E Tosatto
- Department of Biomedical Sciences, University of Padua, via U. Bassi 58/b, 35131 Padua, Italy
| | - Cathy H Wu
- Protein Information Resource, Georgetown University Medical Center, Washington, DC 20007, USA
| | - Alex Bateman
- European Molecular Biology Laboratory, European Bioinformatics Institute (EMBL-EBI), Wellcome Genome Campus, Hinxton, Cambridgeshire CB10 1SD, UK
| | - Robert D Finn
- European Molecular Biology Laboratory, European Bioinformatics Institute (EMBL-EBI), Wellcome Genome Campus, Hinxton, Cambridgeshire CB10 1SD, UK
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Mortensen M, Huckvale R, Pandurangan AP, Baker JR, Smart TG. Optopharmacology reveals a differential contribution of native GABA A receptors to dendritic and somatic inhibition using azogabazine. Neuropharmacology 2020; 176:108135. [PMID: 32445639 PMCID: PMC7482436 DOI: 10.1016/j.neuropharm.2020.108135] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2020] [Revised: 04/20/2020] [Accepted: 05/09/2020] [Indexed: 12/13/2022]
Abstract
γ-aminobutyric acid type-A receptors (GABAARs) are inhibitory ligand-gated ion channels in the brain that are crucial for controlling neuronal excitation. To explore their physiological roles in cellular and neural network activity, it is important to understand why specific GABAAR isoforms are distributed not only to various brain regions and cell types, but also to specific areas of the membrane in individual neurons. To address this aim we have developed a novel photosensitive compound, azogabazine, that targets and reversibly inhibits GABAARs. The receptor selectivity of the compound is based on the competitive antagonist, gabazine, and photosensitivity is conferred by a photoisomerisable azobenzene group. Azogabazine can exist in either cis or trans conformations that are controlled by UV and blue light respectively, to affect receptor inhibition. We report that the trans-isomer preferentially binds and inhibits GABAAR function, whilst promotion of the cis-isomer caused unbinding of azogabazine from GABAARs. Using cultured cerebellar granule cells, azogabazine in conjunction with UV light applied to defined membrane domains, revealed higher densities of GABAARs at somatic inhibitory synapses compared to those populating proximal dendritic zones, even though the latter displayed a higher number of synapses per unit area of membrane. Azogabazine also revealed more pronounced GABA-mediated inhibition of action potential firing in proximal dendrites compared to the soma. Overall, azogabazine is a valuable addition to the photochemical toolkit that can be used to interrogate GABAAR function and inhibition.
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Affiliation(s)
- Martin Mortensen
- Department of Neuroscience, Physiology and Pharmacology, University College London, Gower Street, London, WC1E 6BT, UK
| | - Rosemary Huckvale
- The Institute of Cancer Research, 123 Old Brompton Road, London, SW7 3RP, UK
| | - Arun P Pandurangan
- MRC Laboratory of Molecular Biology, Francis Crick Avenue, Cambridge Biomedical Campus, Cambridge, CB2 0QH, UK
| | - James R Baker
- Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ, UK
| | - Trevor G Smart
- Department of Neuroscience, Physiology and Pharmacology, University College London, Gower Street, London, WC1E 6BT, UK.
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5
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Mitchell AL, Attwood TK, Babbitt PC, Blum M, Bork P, Bridge A, Brown SD, Chang HY, El-Gebali S, Fraser MI, Gough J, Haft DR, Huang H, Letunic I, Lopez R, Luciani A, Madeira F, Marchler-Bauer A, Mi H, Natale DA, Necci M, Nuka G, Orengo C, Pandurangan AP, Paysan-Lafosse T, Pesseat S, Potter SC, Qureshi MA, Rawlings ND, Redaschi N, Richardson LJ, Rivoire C, Salazar GA, Sangrador-Vegas A, Sigrist CJA, Sillitoe I, Sutton GG, Thanki N, Thomas PD, Tosatto SCE, Yong SY, Finn RD. InterPro in 2019: improving coverage, classification and access to protein sequence annotations. Nucleic Acids Res 2020; 47:D351-D360. [PMID: 30398656 PMCID: PMC6323941 DOI: 10.1093/nar/gky1100] [Citation(s) in RCA: 958] [Impact Index Per Article: 239.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2018] [Accepted: 10/22/2018] [Indexed: 12/15/2022] Open
Abstract
The InterPro database (http://www.ebi.ac.uk/interpro/) classifies protein sequences into families and predicts the presence of functionally important domains and sites. Here, we report recent developments with InterPro (version 70.0) and its associated software, including an 18% growth in the size of the database in terms on new InterPro entries, updates to content, the inclusion of an additional entry type, refined modelling of discontinuous domains, and the development of a new programmatic interface and website. These developments extend and enrich the information provided by InterPro, and provide greater flexibility in terms of data access. We also show that InterPro's sequence coverage has kept pace with the growth of UniProtKB, and discuss how our evaluation of residue coverage may help guide future curation activities.
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Affiliation(s)
- Alex L Mitchell
- European Molecular Biology Laboratory, European Bioinformatics Institute (EMBL-EBI), Wellcome Trust Genome Campus, Hinxton, Cambridge CB10 1SD, UK
| | - Teresa K Attwood
- School of Computer Science, The University of Manchester, Manchester M13 9PL, UK
| | - Patricia C Babbitt
- Department of Bioengineering & Therapeutic Sciences, University of California, San Francisco, CA 94158, USA
| | - Matthias Blum
- European Molecular Biology Laboratory, European Bioinformatics Institute (EMBL-EBI), Wellcome Trust Genome Campus, Hinxton, Cambridge CB10 1SD, UK
| | - Peer Bork
- European Molecular Biology Laboratory, Structural and Computational Biology Unit, Meyerhofstr.1, 69117 Heidelberg, Germany
| | - Alan Bridge
- Swiss-Prot Group, SIB Swiss Institute of Bioinformatics, CMU, 1 rue Michel-Servet, CH-1211 Geneva 4, Switzerland
| | - Shoshana D Brown
- Department of Bioengineering & Therapeutic Sciences, University of California, San Francisco, CA 94158, USA
| | - Hsin-Yu Chang
- European Molecular Biology Laboratory, European Bioinformatics Institute (EMBL-EBI), Wellcome Trust Genome Campus, Hinxton, Cambridge CB10 1SD, UK
| | - Sara El-Gebali
- European Molecular Biology Laboratory, European Bioinformatics Institute (EMBL-EBI), Wellcome Trust Genome Campus, Hinxton, Cambridge CB10 1SD, UK
| | - Matthew I Fraser
- European Molecular Biology Laboratory, European Bioinformatics Institute (EMBL-EBI), Wellcome Trust Genome Campus, Hinxton, Cambridge CB10 1SD, UK
| | - Julian Gough
- Medical Research Council Laboratory of Molecular Biology, Francis Crick Avenue, Cambridge Biomedical Campus, Cambridge CB2 0QH, UK
| | - David R Haft
- J. Craig Venter Institute (JCVI), 9605 Medical Center Drive, Suite 150, Rockville, MD 20850, USA
| | - Hongzhan Huang
- Center for Bioinformatics and Computational Biology, University of Delaware, Newark, DE, USA
| | - Ivica Letunic
- Biobyte Solutions GmbH, Bothestr 142, 69126 Heidelberg, Germany
| | - Rodrigo Lopez
- European Molecular Biology Laboratory, European Bioinformatics Institute (EMBL-EBI), Wellcome Trust Genome Campus, Hinxton, Cambridge CB10 1SD, UK
| | - Aurélien Luciani
- European Molecular Biology Laboratory, European Bioinformatics Institute (EMBL-EBI), Wellcome Trust Genome Campus, Hinxton, Cambridge CB10 1SD, UK
| | - Fabio Madeira
- European Molecular Biology Laboratory, European Bioinformatics Institute (EMBL-EBI), Wellcome Trust Genome Campus, Hinxton, Cambridge CB10 1SD, UK
| | - Aron Marchler-Bauer
- National Center for Biotechnology Information, National Library of Medicine, NIH Bldg, 38A, 8600 Rockville Pike, Bethesda, MD 20894, USA
| | - Huaiyu Mi
- Division of Bioinformatics, Department of Preventive Medicine, University of Southern California, Los Angeles, CA 90033, USA
| | - Darren A Natale
- Protein Information Resource, Georgetown University Medical Center, Washington, DC, USA
| | - Marco Necci
- Department of Biomedical Sciences, University of Padua, via U. Bassi 58/b, 35131 Padua, Italy.,Department of Agricultural Sciences, University of Udine, via Palladio 8, 33100 Udine, Italy.,Fondazione Edmund Mach, Via E. Mach 1, 38010 S. Michele all'Adige, Italy
| | - Gift Nuka
- European Molecular Biology Laboratory, European Bioinformatics Institute (EMBL-EBI), Wellcome Trust Genome Campus, Hinxton, Cambridge CB10 1SD, UK
| | - Christine Orengo
- Structural and Molecular Biology, University College London, Darwin Building, London WC1E 6BT, UK
| | - Arun P Pandurangan
- Medical Research Council Laboratory of Molecular Biology, Francis Crick Avenue, Cambridge Biomedical Campus, Cambridge CB2 0QH, UK
| | - Typhaine Paysan-Lafosse
- European Molecular Biology Laboratory, European Bioinformatics Institute (EMBL-EBI), Wellcome Trust Genome Campus, Hinxton, Cambridge CB10 1SD, UK
| | - Sebastien Pesseat
- European Molecular Biology Laboratory, European Bioinformatics Institute (EMBL-EBI), Wellcome Trust Genome Campus, Hinxton, Cambridge CB10 1SD, UK
| | - Simon C Potter
- European Molecular Biology Laboratory, European Bioinformatics Institute (EMBL-EBI), Wellcome Trust Genome Campus, Hinxton, Cambridge CB10 1SD, UK
| | - Matloob A Qureshi
- European Molecular Biology Laboratory, European Bioinformatics Institute (EMBL-EBI), Wellcome Trust Genome Campus, Hinxton, Cambridge CB10 1SD, UK
| | - Neil D Rawlings
- European Molecular Biology Laboratory, European Bioinformatics Institute (EMBL-EBI), Wellcome Trust Genome Campus, Hinxton, Cambridge CB10 1SD, UK
| | - Nicole Redaschi
- Swiss-Prot Group, SIB Swiss Institute of Bioinformatics, CMU, 1 rue Michel-Servet, CH-1211 Geneva 4, Switzerland
| | - Lorna J Richardson
- European Molecular Biology Laboratory, European Bioinformatics Institute (EMBL-EBI), Wellcome Trust Genome Campus, Hinxton, Cambridge CB10 1SD, UK
| | - Catherine Rivoire
- Swiss-Prot Group, SIB Swiss Institute of Bioinformatics, CMU, 1 rue Michel-Servet, CH-1211 Geneva 4, Switzerland
| | - Gustavo A Salazar
- European Molecular Biology Laboratory, European Bioinformatics Institute (EMBL-EBI), Wellcome Trust Genome Campus, Hinxton, Cambridge CB10 1SD, UK
| | - Amaia Sangrador-Vegas
- European Molecular Biology Laboratory, European Bioinformatics Institute (EMBL-EBI), Wellcome Trust Genome Campus, Hinxton, Cambridge CB10 1SD, UK
| | - Christian J A Sigrist
- Swiss-Prot Group, SIB Swiss Institute of Bioinformatics, CMU, 1 rue Michel-Servet, CH-1211 Geneva 4, Switzerland
| | - Ian Sillitoe
- Structural and Molecular Biology, University College London, Darwin Building, London WC1E 6BT, UK
| | - Granger G Sutton
- J. Craig Venter Institute (JCVI), 9605 Medical Center Drive, Suite 150, Rockville, MD 20850, USA
| | - Narmada Thanki
- National Center for Biotechnology Information, National Library of Medicine, NIH Bldg, 38A, 8600 Rockville Pike, Bethesda, MD 20894, USA
| | - Paul D Thomas
- Division of Bioinformatics, Department of Preventive Medicine, University of Southern California, Los Angeles, CA 90033, USA
| | - Silvio C E Tosatto
- Department of Biomedical Sciences, University of Padua, via U. Bassi 58/b, 35131 Padua, Italy
| | - Siew-Yit Yong
- European Molecular Biology Laboratory, European Bioinformatics Institute (EMBL-EBI), Wellcome Trust Genome Campus, Hinxton, Cambridge CB10 1SD, UK
| | - Robert D Finn
- European Molecular Biology Laboratory, European Bioinformatics Institute (EMBL-EBI), Wellcome Trust Genome Campus, Hinxton, Cambridge CB10 1SD, UK
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Leung C, Dudkina NV, Lukoyanova N, Hodel AW, Farabella I, Pandurangan AP, Jahan N, Pires Damaso M, Osmanović D, Reboul CF, Dunstone MA, Andrew PW, Lonnen R, Topf M, Saibil HR, Hoogenboom BW. Stepwise visualization of membrane pore formation by suilysin, a bacterial cholesterol-dependent cytolysin. eLife 2014; 3:e04247. [PMID: 25457051 PMCID: PMC4381977 DOI: 10.7554/elife.04247] [Citation(s) in RCA: 140] [Impact Index Per Article: 14.0] [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: 08/05/2014] [Accepted: 11/24/2014] [Indexed: 12/23/2022] Open
Abstract
Membrane attack complex/perforin/cholesterol-dependent cytolysin (MACPF/CDC) proteins constitute a major superfamily of pore-forming proteins that act as bacterial virulence factors and effectors in immune defence. Upon binding to the membrane, they convert from the soluble monomeric form to oligomeric, membrane-inserted pores. Using real-time atomic force microscopy (AFM), electron microscopy (EM), and atomic structure fitting, we have mapped the structure and assembly pathways of a bacterial CDC in unprecedented detail and accuracy, focussing on suilysin from Streptococcus suis. We show that suilysin assembly is a noncooperative process that is terminated before the protein inserts into the membrane. The resulting ring-shaped pores and kinetically trapped arc-shaped assemblies are all seen to perforate the membrane, as also visible by the ejection of its lipids. Membrane insertion requires a concerted conformational change of the monomeric subunits, with a marked expansion in pore diameter due to large changes in subunit structure and packing.
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Affiliation(s)
- Carl Leung
- London Centre for Nanotechnology, University College London, London, United Kingdom
| | - Natalya V Dudkina
- Department of Crystallography, Birkbeck College, London, United Kingdom
| | | | - Adrian W Hodel
- London Centre for Nanotechnology, University College London, London, United Kingdom
| | - Irene Farabella
- Department of Crystallography, Birkbeck College, London, United Kingdom
| | | | - Nasrin Jahan
- Department of Infection, Immunity, and Inflammation, University of Leicester, Leicester, United Kingdom
| | - Mafalda Pires Damaso
- Department of Infection, Immunity, and Inflammation, University of Leicester, Leicester, United Kingdom
| | - Dino Osmanović
- London Centre for Nanotechnology, University College London, London, United Kingdom
| | - Cyril F Reboul
- Department of Biochemistry and Molecular Biology, Monash University, Melbourne, Australia
| | - Michelle A Dunstone
- Department of Biochemistry and Molecular Biology, Monash University, Melbourne, Australia
| | - Peter W Andrew
- Department of Infection, Immunity, and Inflammation, University of Leicester, Leicester, United Kingdom
| | - Rana Lonnen
- Department of Infection, Immunity, and Inflammation, University of Leicester, Leicester, United Kingdom
| | - Maya Topf
- Department of Crystallography, Birkbeck College, London, United Kingdom
| | - Helen R Saibil
- Department of Crystallography, Birkbeck College, London, United Kingdom
| | - Bart W Hoogenboom
- London Centre for Nanotechnology, University College London, London, United Kingdom
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7
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Mortensen M, Iqbal F, Pandurangan AP, Hannan S, Huckvale R, Topf M, Baker JR, Smart TG. Photo-antagonism of the GABAA receptor. Nat Commun 2014; 5:4454. [PMID: 25072879 PMCID: PMC4124873 DOI: 10.1038/ncomms5454] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2013] [Accepted: 06/19/2014] [Indexed: 11/23/2022] Open
Abstract
Neurotransmitter receptor trafficking is fundamentally important for synaptic transmission and neural network activity. GABAA receptors and inhibitory synapses are vital components of brain function, yet much of our knowledge regarding receptor mobility and function at inhibitory synapses is derived indirectly from using recombinant receptors, antibody-tagged native receptors and pharmacological treatments. Here we describe the use of a set of research tools that can irreversibly bind to and affect the function of recombinant and neuronal GABAA receptors following ultraviolet photoactivation. These compounds are based on the competitive antagonist gabazine and incorporate a variety of photoactive groups. By using site-directed mutagenesis and ligand-docking studies, they reveal new areas of the GABA binding site at the interface between receptor β and α subunits. These compounds enable the selected inactivation of native GABAA receptor populations providing new insight into the function of inhibitory synapses and extrasynaptic receptors in controlling neuronal excitation.
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Affiliation(s)
- Martin Mortensen
- Department of Neuroscience, Physiology and Pharmacology, University College London, Gower Street, London WC1E 6BT, UK
| | - Favaad Iqbal
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, UK
| | - Arun P. Pandurangan
- Institute of Structural and Molecular Biology, Crystallography/Department of Biological Sciences, Birkbeck College, University of London, London WC1E 7HX, UK
| | - Saad Hannan
- Department of Neuroscience, Physiology and Pharmacology, University College London, Gower Street, London WC1E 6BT, UK
| | - Rosemary Huckvale
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, UK
| | - Maya Topf
- Institute of Structural and Molecular Biology, Crystallography/Department of Biological Sciences, Birkbeck College, University of London, London WC1E 7HX, UK
| | - James R. Baker
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, UK
| | - Trevor G. Smart
- Department of Neuroscience, Physiology and Pharmacology, University College London, Gower Street, London WC1E 6BT, UK
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