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Malagrinò F, Fusco G, Pennacchietti V, Toto A, Nardella C, Pagano L, de Simone A, Gianni S. Cryptic binding properties of a transient folding intermediate in a PDZ tandem repeat. Protein Sci 2022; 31:e4396. [PMID: 36040267 PMCID: PMC9375522 DOI: 10.1002/pro.4396] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2022] [Revised: 06/10/2022] [Accepted: 07/01/2022] [Indexed: 12/17/2022]
Abstract
PDZ domains are the most diffused protein-protein interaction modules of the human proteome and are often present in tandem repeats. An example is PDZD2, a protein characterized by the presence of six PDZ domains that undergoes a proteolytic cleavage producing sPDZD2, comprising a tandem of two PDZ domains, namely PDZ5 and PDZ6. Albeit the physiopathological importance of sPDZD2 is well-established, the interaction with endogenous ligands has been poorly characterized. To understand the determinants of the stability and function of sPDZD2, we investigated its folding pathway. Our data highlights the presence of a complex scenario involving a transiently populated folding intermediate that may be accumulated from the concurrent denaturation of both PDZ5 and PDZ6 domains. Importantly, double jump kinetic experiments allowed us to pinpoint the ability of this transient intermediate to bind the physiological ligand of sPDZD2 with increased affinity compared to the native state. In summary, our results provide an interesting example of a functionally competent misfolded intermediate, which may exert a cryptic function that is not captured from the analysis of the native state only.
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Affiliation(s)
- Francesca Malagrinò
- Istituto Pasteur – Fondazione Cenci Bolognetti, Dipartimento di Scienze Biochimiche “A. Rossi Fanelli” and Istituto di Biologia e Patologia Molecolari del CNRSapienza Università di RomaRomeItaly
| | - Giuliana Fusco
- Centre for Misfolding Diseases, Yusuf Hamied Department of ChemistryUniversity of CambridgeCambridgeUK
| | - Valeria Pennacchietti
- Istituto Pasteur – Fondazione Cenci Bolognetti, Dipartimento di Scienze Biochimiche “A. Rossi Fanelli” and Istituto di Biologia e Patologia Molecolari del CNRSapienza Università di RomaRomeItaly
| | - Angelo Toto
- Istituto Pasteur – Fondazione Cenci Bolognetti, Dipartimento di Scienze Biochimiche “A. Rossi Fanelli” and Istituto di Biologia e Patologia Molecolari del CNRSapienza Università di RomaRomeItaly
| | - Caterina Nardella
- Istituto Pasteur – Fondazione Cenci Bolognetti, Dipartimento di Scienze Biochimiche “A. Rossi Fanelli” and Istituto di Biologia e Patologia Molecolari del CNRSapienza Università di RomaRomeItaly
| | - Livia Pagano
- Istituto Pasteur – Fondazione Cenci Bolognetti, Dipartimento di Scienze Biochimiche “A. Rossi Fanelli” and Istituto di Biologia e Patologia Molecolari del CNRSapienza Università di RomaRomeItaly
| | - Alfonso de Simone
- Dipartimento di FarmaciaUniversità degli Studi di Napoli Federico IINaplesItaly
| | - Stefano Gianni
- Dipartimento di FarmaciaUniversità degli Studi di Napoli Federico IINaplesItaly
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Sanfelice D, Sanz-Hernández M, de Simone A, Bullard B, Pastore A. Toward Understanding the Molecular Bases of Stretch Activation: A STRUCTURAL COMPARISON OF THE TWO TROPONIN C ISOFORMS OF LETHOCERUS. J Biol Chem 2016; 291:16090-9. [PMID: 27226601 PMCID: PMC4965559 DOI: 10.1074/jbc.m116.726646] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [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: 03/10/2016] [Indexed: 11/25/2022] Open
Abstract
Muscles are usually activated by calcium binding to the calcium sensory protein troponin-C, which is one of the three components of the troponin complex. However, in cardiac and insect flight muscle activation is also produced by mechanical stress. Little is known about the molecular bases of this calcium-independent activation. In Lethocerus, a giant water bug often used as a model system because of its large muscle fibers, there are two troponin-C isoforms, called F1 and F2, that have distinct roles in activating the muscle. It has been suggested that this can be explained either by differences in structural features or by differences in the interactions with other proteins. Here we have compared the structural and dynamic properties of the two proteins and shown how they differ. We have also mapped the interactions of the F2 isoform with peptides spanning the sequence of its natural partner, troponin-I. Our data have allowed us to build a model of the troponin complex and may eventually help in understanding the specialized function of the F1 and F2 isoforms and the molecular mechanism of stretch activation.
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Affiliation(s)
- Domenico Sanfelice
- From the Department of Clinical and Basic Neurosciences, Wohl Institute, King's College, London SE5 3RT, United Kingdom
| | | | - Alfonso de Simone
- the Department of Life Sciences, Imperial College, London SW7 2AZ, United Kingdom
| | - Belinda Bullard
- the Department of Biology, University of York, York YO10 5DD, United Kingdom, and
| | - Annalisa Pastore
- From the Department of Clinical and Basic Neurosciences, Wohl Institute, King's College, London SE5 3RT, United Kingdom, the Department of Molecular Medicine, Universita' of Pavia, Pavia I27100, Italy
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Taylor JD, Hawthorne WJ, Lo J, Dear A, Jain N, Meisl G, Andreasen M, Fletcher C, Koch M, Darvill N, Scull N, Escalera-Maurer A, Sefer L, Wenman R, Lambert S, Jean J, Xu Y, Turner B, Kazarian SG, Chapman MR, Bubeck D, de Simone A, Knowles TPJ, Matthews SJ. Electrostatically-guided inhibition of Curli amyloid nucleation by the CsgC-like family of chaperones. Sci Rep 2016; 6:24656. [PMID: 27098162 PMCID: PMC4838910 DOI: 10.1038/srep24656] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2015] [Accepted: 03/29/2016] [Indexed: 11/16/2022] Open
Abstract
Polypeptide aggregation into amyloid is linked with several debilitating human diseases. Despite the inherent risk of aggregation-induced cytotoxicity, bacteria control the export of amyloid-prone subunits and assemble adhesive amyloid fibres during biofilm formation. An Escherichia protein, CsgC potently inhibits amyloid formation of curli amyloid proteins. Here we unlock its mechanism of action, and show that CsgC strongly inhibits primary nucleation via electrostatically-guided molecular encounters, which expands the conformational distribution of disordered curli subunits. This delays the formation of higher order intermediates and maintains amyloidogenic subunits in a secretion-competent form. New structural insight also reveal that CsgC is part of diverse family of bacterial amyloid inhibitors. Curli assembly is therefore not only arrested in the periplasm, but the preservation of conformational flexibility also enables efficient secretion to the cell surface. Understanding how bacteria safely handle amyloidogenic polypeptides contribute towards efforts to control aggregation in disease-causing amyloids and amyloid-based biotechnological applications.
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Affiliation(s)
- Jonathan D Taylor
- Department of Life Sciences, Imperial College London, London, SW7 2AZ, UK
| | | | - Joanne Lo
- Department of Life Sciences, Imperial College London, London, SW7 2AZ, UK
| | - Alexander Dear
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK
| | - Neha Jain
- Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, MI 48109, USA
| | - Georg Meisl
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK
| | - Maria Andreasen
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK
| | - Catherine Fletcher
- Department of Life Sciences, Imperial College London, London, SW7 2AZ, UK
| | - Marion Koch
- Department of Life Sciences, Imperial College London, London, SW7 2AZ, UK
| | - Nicholas Darvill
- Department of Life Sciences, Imperial College London, London, SW7 2AZ, UK
| | - Nicola Scull
- Department of Life Sciences, Imperial College London, London, SW7 2AZ, UK
| | | | - Lea Sefer
- Department of Life Sciences, Imperial College London, London, SW7 2AZ, UK
| | - Rosemary Wenman
- Department of Life Sciences, Imperial College London, London, SW7 2AZ, UK
| | - Sebastian Lambert
- Department of Life Sciences, Imperial College London, London, SW7 2AZ, UK
| | - Jisoo Jean
- Department of Life Sciences, Imperial College London, London, SW7 2AZ, UK
| | - Yingqi Xu
- Department of Life Sciences, Imperial College London, London, SW7 2AZ, UK
| | - Benjamin Turner
- Department of Chemical Engineering, Imperial College London, London, SW7 2AZ, UK
| | - Sergei G Kazarian
- Department of Chemical Engineering, Imperial College London, London, SW7 2AZ, UK
| | - Matthew R Chapman
- Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, MI 48109, USA
| | - Doryen Bubeck
- Department of Life Sciences, Imperial College London, London, SW7 2AZ, UK
| | - Alfonso de Simone
- Department of Life Sciences, Imperial College London, London, SW7 2AZ, UK
| | - Tuomas P J Knowles
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK
| | - Steve J Matthews
- Department of Life Sciences, Imperial College London, London, SW7 2AZ, UK
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Barberio E, Boudreau J, Butler B, Cheung SL, Dell'Acqua A, Simone AD, Ehrenfeld W, Gallas MV, Glazov A, Marshall Z, Mueller J, Plačakytė R, Rimoldi A, Savard P, Tsulaia V, Waugh A, Young CC. Fast shower simulation in the ATLAS calorimeter. ACTA ACUST UNITED AC 2008. [DOI: 10.1088/1742-6596/119/3/032008] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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