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Adrien V, Reffay M, Taulier N, Verchère A, Monlezun L, Picard M, Ducruix A, Broutin I, Pincet F, Urbach W. Author Correction: Kinetic study of membrane protein interactions: from three to two dimensions. Sci Rep 2024; 14:8222. [PMID: 38589433 PMCID: PMC11001852 DOI: 10.1038/s41598-024-58201-9] [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: 04/10/2024] Open
Affiliation(s)
- Vladimir Adrien
- Laboratoire de Physique de l'École normale superieure, École Normale Supérieure, Université Paris Sciences et Lettres, CNRS, Sorbonne Université, Université Paris Cité, F-75005, Paris, France.
- Department of Infectious Diseases, Avicenne Hospital, AP-HP, Université Sorbonne Paris Nord, Bobigny, France.
- Université Paris Cité, Inserm UMR-S 1266, Institute of Psychiatry and Neuroscience of Paris (IPNP), Paris, France.
| | - Myriam Reffay
- Laboratoire Matière et Systèmes Complexes, UMR 7057, CNRS, Université de Paris Cité, 75205, Paris Cedex 13, France
| | - Nicolas Taulier
- Sorbonne Université, CNRS, INSERM, Laboratoire d'Imagerie Biomédicale-LIB, 75006, Paris, France
| | - Alice Verchère
- Laboratoire CiTCoM, Faculté de Santé, Université Paris Cité, CNRS, 75006, Paris, France
| | - Laura Monlezun
- Université Paris Cité, CNRS, Expression Génétique Microbienne, Institut de Biologie Physico-Chimique, Paris, France
| | - Martin Picard
- Université Paris Cité, Laboratoire de Biologie Physico-Chimique des Protéines Membranaires CNRS UMR7099, 75005, Paris, France
- Institut de Biologie Physico-Chimique, Fondation Edmond de Rothschild, 75005, Paris, France
| | - Arnaud Ducruix
- Laboratoire CiTCoM, Faculté de Santé, Université Paris Cité, CNRS, 75006, Paris, France
| | - Isabelle Broutin
- Laboratoire CiTCoM, Faculté de Santé, Université Paris Cité, CNRS, 75006, Paris, France
| | - Frédéric Pincet
- Laboratoire de Physique de l'École normale superieure, École Normale Supérieure, Université Paris Sciences et Lettres, CNRS, Sorbonne Université, Université Paris Cité, F-75005, Paris, France.
| | - Wladimir Urbach
- Laboratoire de Physique de l'École normale superieure, École Normale Supérieure, Université Paris Sciences et Lettres, CNRS, Sorbonne Université, Université Paris Cité, F-75005, Paris, France.
- Sorbonne Université, CNRS, INSERM, Laboratoire d'Imagerie Biomédicale-LIB, 75006, Paris, France.
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2
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Adrien V, Reffay M, Taulier N, Verchère A, Monlezun L, Picard M, Ducruix A, Broutin I, Pincet F, Urbach W. Kinetic study of membrane protein interactions: from three to two dimensions. Sci Rep 2024; 14:882. [PMID: 38195620 PMCID: PMC10776792 DOI: 10.1038/s41598-023-50827-5] [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: 04/02/2023] [Accepted: 12/26/2023] [Indexed: 01/11/2024] Open
Abstract
Molecular interactions are contingent upon the system's dimensionality. Notably, comprehending the impact of dimensionality on protein-protein interactions holds paramount importance in foreseeing protein behaviour across diverse scenarios, encompassing both solution and membrane environments. Here, we unravel interactions among membrane proteins across various dimensionalities by quantifying their binding rates through fluorescence recovery experiments. Our findings are presented through the examination of two protein systems: streptavidin-biotin and a protein complex constituting a bacterial efflux pump. We present here an original approach for gauging a two-dimensional binding constant between membrane proteins embedded in two opposite membranes. The quotient of protein binding rates in solution and on the membrane represents a metric denoting the exploration distance of the interacting sites-a novel interpretation.
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Affiliation(s)
- Vladimir Adrien
- Laboratoire de Physique de l'École normale superieure, École Normale Supérieure, Université Paris Sciences et Lettres, CNRS, Sorbonne Université, Université Paris Cité, F-75005, Paris, France.
- Department of Infectious Diseases, Avicenne Hospital, AP-HP, Université Sorbonne Paris Nord, Bobigny, France.
- Université Paris Cité, Inserm UMR-S 1266, Institute of Psychiatry and Neuroscience of Paris (IPNP), Paris, France.
| | - Myriam Reffay
- Laboratoire Matière et Systèmes Complexes, UMR 7057, CNRS and Université de Paris Cité, 75205, Paris Cedex 13, France
| | - Nicolas Taulier
- Sorbonne Université, CNRS, INSERM, Laboratoire d'Imagerie Biomédicale-LIB, 75006, Paris, France
| | - Alice Verchère
- Laboratoire CiTCoM, Faculté de Santé, Université Paris Cité, CNRS, 75006, Paris, France
| | - Laura Monlezun
- Université Paris Cité, CNRS, Expression Génétique Microbienne, Institut de Biologie Physico-Chimique, Paris, France
| | - Martin Picard
- Université Paris Cité, Laboratoire de Biologie Physico-Chimique des Protéines Membranaires CNRS UMR7099, 75005, Paris, France
- Institut de Biologie Physico-Chimique, Fondation Edmond de Rothschild, 75005, Paris, France
| | - Arnaud Ducruix
- Laboratoire CiTCoM, Faculté de Santé, Université Paris Cité, CNRS, 75006, Paris, France
| | - Isabelle Broutin
- Laboratoire CiTCoM, Faculté de Santé, Université Paris Cité, CNRS, 75006, Paris, France
| | - Frédéric Pincet
- Laboratoire de Physique de l'École normale superieure, École Normale Supérieure, Université Paris Sciences et Lettres, CNRS, Sorbonne Université, Université Paris Cité, F-75005, Paris, France.
| | - Wladimir Urbach
- Laboratoire de Physique de l'École normale superieure, École Normale Supérieure, Université Paris Sciences et Lettres, CNRS, Sorbonne Université, Université Paris Cité, F-75005, Paris, France.
- Sorbonne Université, CNRS, INSERM, Laboratoire d'Imagerie Biomédicale-LIB, 75006, Paris, France.
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Reglinski M, Monlezun L, Coulthurst SJ. The accessory protein TagV is required for full Type VI secretion system activity in Serratia marcescens. Mol Microbiol 2023; 119:326-339. [PMID: 36627840 PMCID: PMC7614798 DOI: 10.1111/mmi.15027] [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: 07/13/2022] [Revised: 12/21/2022] [Accepted: 01/06/2023] [Indexed: 01/12/2023]
Abstract
The bacterial Type VI secretion system (T6SS) is a dynamic macromolecular structure that promotes inter- and intra-species competition through the delivery of toxic effector proteins into neighbouring cells. The T6SS contains 14 well-characterised core proteins necessary for effector delivery (TssA-M, PAAR). In this study, we have identified a novel accessory component required for optimal T6SS activity in the opportunistic pathogen Serratia marcescens, which we name TagV. Deletion of tagV, which encodes an outer membrane lipoprotein, caused a reduction in the T6SS-dependent antibacterial activity of S. marcescens Db10. Mutants of S. marcescens lacking the core component TssJ, a distinct outer membrane lipoprotein previously considered essential for T6SS firing, retained a modest T6SS activity that could be abolished through deletion of tagV. TagV did not interact with the T6SS membrane complex proteins TssL or TssM, but is proposed to bind to peptidoglycan, indicating that the mechanism by which TagV promotes T6SS firing differs from that of TssJ. Homologues of tagV were identified in several other bacterial genera, suggesting that the accessory function of TagV is not restricted to S. marcescens. Together, our findings support the existence of a second, TssJ-independent mechanism for T6SS firing that is dependent upon the activity of TagV proteins.
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Affiliation(s)
- Mark Reglinski
- Division of Molecular Microbiology, School of Life Sciences, University of Dundee, Dundee, UK
| | - Laura Monlezun
- Division of Molecular Microbiology, School of Life Sciences, University of Dundee, Dundee, UK
| | - Sarah J Coulthurst
- Division of Molecular Microbiology, School of Life Sciences, University of Dundee, Dundee, UK
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4
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Fostier CR, Monlezun L, Ousalem F, Singh S, Hunt JF, Boël G. ABC-F translation factors: from antibiotic resistance to immune response. FEBS Lett 2020; 595:675-706. [PMID: 33135152 DOI: 10.1002/1873-3468.13984] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2020] [Revised: 10/13/2020] [Accepted: 10/15/2020] [Indexed: 12/24/2022]
Abstract
Energy-dependent translational throttle A (EttA) from Escherichia coli is a paradigmatic ABC-F protein that controls the first step in polypeptide elongation on the ribosome according to the cellular energy status. Biochemical and structural studies have established that ABC-F proteins generally function as translation factors that modulate the conformation of the peptidyl transferase center upon binding to the ribosomal tRNA exit site. These factors, present in both prokaryotes and eukaryotes but not in archaea, use related molecular mechanisms to modulate protein synthesis for heterogenous purposes, ranging from antibiotic resistance and rescue of stalled ribosomes to modulation of the mammalian immune response. Here, we review the canonical studies characterizing the phylogeny, regulation, ribosome interactions, and mechanisms of action of the bacterial ABC-F proteins, and discuss the implications of these studies for the molecular function of eukaryotic ABC-F proteins, including the three human family members.
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Affiliation(s)
- Corentin R Fostier
- UMR 8261, CNRS, Université de Paris, Institut de Biologie Physico-Chimique, Paris, France
| | - Laura Monlezun
- UMR 8261, CNRS, Université de Paris, Institut de Biologie Physico-Chimique, Paris, France
| | - Farès Ousalem
- UMR 8261, CNRS, Université de Paris, Institut de Biologie Physico-Chimique, Paris, France
| | - Shikha Singh
- Department of Biological Sciences, 702A Sherman Fairchild Center, Columbia University, New York, NY, USA
| | - John F Hunt
- Department of Biological Sciences, 702A Sherman Fairchild Center, Columbia University, New York, NY, USA
| | - Grégory Boël
- UMR 8261, CNRS, Université de Paris, Institut de Biologie Physico-Chimique, Paris, France
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5
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Mariano G, Trunk K, Williams DJ, Monlezun L, Strahl H, Pitt SJ, Coulthurst SJ. A family of Type VI secretion system effector proteins that form ion-selective pores. Nat Commun 2019; 10:5484. [PMID: 31792213 PMCID: PMC6889166 DOI: 10.1038/s41467-019-13439-0] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2019] [Accepted: 11/05/2019] [Indexed: 12/25/2022] Open
Abstract
Type VI secretion systems (T6SSs) are nanomachines widely used by bacteria to deliver toxic effector proteins directly into neighbouring cells. However, the modes of action of many effectors remain unknown. Here we report that Ssp6, an anti-bacterial effector delivered by a T6SS of the opportunistic pathogen Serratia marcescens, is a toxin that forms ion-selective pores. Ssp6 inhibits bacterial growth by causing depolarisation of the inner membrane in intoxicated cells, together with increased outer membrane permeability. Reconstruction of Ssp6 activity in vitro demonstrates that it forms cation-selective pores. A survey of bacterial genomes reveals that genes encoding Ssp6-like effectors are widespread in Enterobacteriaceae and often linked with T6SS genes. We conclude that Ssp6 and similar proteins represent a new family of T6SS-delivered anti-bacterial effectors.
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Affiliation(s)
- Giuseppina Mariano
- Division of Molecular Microbiology, School of Life Sciences, University of Dundee, Dow St, Dundee, DD1 5EH, UK
| | - Katharina Trunk
- Division of Molecular Microbiology, School of Life Sciences, University of Dundee, Dow St, Dundee, DD1 5EH, UK
| | - David J Williams
- Division of Molecular Microbiology, School of Life Sciences, University of Dundee, Dow St, Dundee, DD1 5EH, UK
| | - Laura Monlezun
- Division of Molecular Microbiology, School of Life Sciences, University of Dundee, Dow St, Dundee, DD1 5EH, UK
| | - Henrik Strahl
- Centre for Bacterial Cell Biology, Newcastle University, Richardson Road, Newcastle-upon-Tyne, NE2 4AX, UK
| | - Samantha J Pitt
- School of Medicine, University of St Andrews, North Haugh, St Andrews, KY16 9TF, UK
| | - Sarah J Coulthurst
- Division of Molecular Microbiology, School of Life Sciences, University of Dundee, Dow St, Dundee, DD1 5EH, UK.
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Mariano G, Monlezun L, Coulthurst SJ. Dual Role for DsbA in Attacking and Targeted Bacterial Cells during Type VI Secretion System-Mediated Competition. Cell Rep 2019; 22:774-785. [PMID: 29346773 PMCID: PMC5792426 DOI: 10.1016/j.celrep.2017.12.075] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2017] [Revised: 12/15/2017] [Accepted: 12/21/2017] [Indexed: 01/23/2023] Open
Abstract
Incorporation of disulfide bonds into proteins can be critical for function or stability. In bacterial cells, the periplasmic enzyme DsbA is responsible for disulfide incorporation into many extra-cytoplasmic proteins. The type VI secretion system (T6SS) is a widely occurring nanomachine that delivers toxic effector proteins directly into rival bacterial cells, playing a key role in inter-bacterial competition. We report that two redundant DsbA proteins are required for virulence and for proper deployment of the T6SS in the opportunistic pathogen Serratia marcescens, with several T6SS components being subject to the action of DsbA in secreting cells. Importantly, we demonstrate that DsbA also plays a critical role in recipient target cells, being required for the toxicity of certain incoming effector proteins. Thus we reveal that target cell functions can be hijacked by T6SS effectors for effector activation, adding a further level of complexity to the T6SS-mediated inter-bacterial interactions which define varied microbial communities. Type VI secretion systems (T6SSs) are used by bacteria to attack competitors Disulfide bond formation by DsbA promotes assembly of an active T6SS in Serratia DsbA in the target cell is needed for activation of certain incoming T6SS effectors This work reveals that T6SS-delivered effectors can hijack target cell functions
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Affiliation(s)
- Giuseppina Mariano
- Division of Molecular Microbiology, School of Life Sciences, University of Dundee, Dundee, DD1 5EH, UK
| | - Laura Monlezun
- Division of Molecular Microbiology, School of Life Sciences, University of Dundee, Dundee, DD1 5EH, UK
| | - Sarah J Coulthurst
- Division of Molecular Microbiology, School of Life Sciences, University of Dundee, Dundee, DD1 5EH, UK.
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7
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Grandjean T, Boucher A, Thepaut M, Monlezun L, Guery B, Faudry E, Kipnis E, Dessein R. The human NAIP-NLRC4-inflammasome senses the Pseudomonas aeruginosa T3SS inner-rod protein. Int Immunol 2018; 29:377-384. [PMID: 28992059 DOI: 10.1093/intimm/dxx047] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [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: 01/29/2017] [Accepted: 08/26/2017] [Indexed: 12/12/2022] Open
Abstract
While NLRC4-dependent sensing of intracellular Gram-negative pathogens such as Salmonella enterica serovar typhimurium is a beneficial host response, NLRC4-dependent sensing of the Pseudomonas aeruginosa type 3 secretion system (T3SS) has been shown to be involved in pathogenicity. In mice, different pathogen-associated microbial patterns are sensed by the combination of the NLRC4-inflammasome with different neuronal apoptosis inhibitory proteins (NAIPs). NAIP2 is involved in sensing PscI, an inner-rod protein of the P. aeruginosa T3SS. Surprisingly, only a single human NAIP (hNAIP) has been found. Moreover, there is no description of hNAIP-NLRC4 inflammasome recognition of T3SS inner-rod proteins in humans. Here, we show that the P. aeruginosa T3SS inner-rod protein PscI and needle protein PscF are both sensed by the hNAIP-NLRC4 inflammasome in human macrophages and PBMCs from healthy donors, allowing caspase-1 and IL-1β maturation and resulting in a robust inflammatory response. TLR4 and TLR2 are involved in redundantly sensing these two T3SS components.
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Affiliation(s)
- Teddy Grandjean
- EA 7366, Host-Pathogens Translational Research Group, Faculty of Medicine of Lille, University of Lille Nord de France, F-59000 Lille, France
| | - Anne Boucher
- EA 7366, Host-Pathogens Translational Research Group, Faculty of Medicine of Lille, University of Lille Nord de France, F-59000 Lille, France
| | - Marion Thepaut
- EA 7366, Host-Pathogens Translational Research Group, Faculty of Medicine of Lille, University of Lille Nord de France, F-59000 Lille, France
| | - Laura Monlezun
- Université Grenoble Alpes, F-38041 Grenoble, France.,CNRS, Bacterial Pathogenesis and Cellular Responses, ERL 5261, F-38054 Grenoble, France.,INSERM, UMR-S 1036, Biology of Cancer and Infection, F-38054 Grenoble, France.,CEA, DSV/iRTSV, F-38054 Grenoble, France
| | - Benoit Guery
- EA 7366, Host-Pathogens Translational Research Group, Faculty of Medicine of Lille, University of Lille Nord de France, F-59000 Lille, France.,Infectious Diseases Service, Centre Hospitalier Universitaire Vaudois and University of Lausanne, CH-1011 Lausanne, Switzerland
| | - Eric Faudry
- Université Grenoble Alpes, F-38041 Grenoble, France.,CNRS, Bacterial Pathogenesis and Cellular Responses, ERL 5261, F-38054 Grenoble, France.,INSERM, UMR-S 1036, Biology of Cancer and Infection, F-38054 Grenoble, France.,CEA, DSV/iRTSV, F-38054 Grenoble, France
| | - Eric Kipnis
- EA 7366, Host-Pathogens Translational Research Group, Faculty of Medicine of Lille, University of Lille Nord de France, F-59000 Lille, France
| | - Rodrigue Dessein
- EA 7366, Host-Pathogens Translational Research Group, Faculty of Medicine of Lille, University of Lille Nord de France, F-59000 Lille, France.,Microbiological Institute, Center of Biology and Pathology, Teaching University Hospital of Lille, Univ Lille Nord de France, F-59000 Lille, France
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8
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Daury L, Orange F, Taveau JC, Verchère A, Monlezun L, Gounou C, Marreddy RKR, Picard M, Broutin I, Pos KM, Lambert O. Tripartite assembly of RND multidrug efflux pumps. Nat Commun 2016; 7:10731. [PMID: 26867482 PMCID: PMC4754349 DOI: 10.1038/ncomms10731] [Citation(s) in RCA: 123] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2015] [Accepted: 01/15/2016] [Indexed: 12/18/2022] Open
Abstract
Tripartite multidrug efflux systems of Gram-negative bacteria are composed of an inner membrane transporter, an outer membrane channel and a periplasmic adaptor protein. They are assumed to form ducts inside the periplasm facilitating drug exit across the outer membrane. Here we present the reconstitution of native Pseudomonas aeruginosa MexAB–OprM and Escherichia coli AcrAB–TolC tripartite Resistance Nodulation and cell Division (RND) efflux systems in a lipid nanodisc system. Single-particle analysis by electron microscopy reveals the inner and outer membrane protein components linked together via the periplasmic adaptor protein. This intrinsic ability of the native components to self-assemble also leads to the formation of a stable interspecies AcrA–MexB–TolC complex suggesting a common mechanism of tripartite assembly. Projection structures of all three complexes emphasize the role of the periplasmic adaptor protein as part of the exit duct with no physical interaction between the inner and outer membrane components. Tripartite efflux systems consist of inner membrane, outer membrane and periplasmic components. Here, Daury et al. reconstitute native versions of RND transporters in nanodiscs and present projection structures emphasizing the role of the periplasmic adaptor in linking the inner and outer membrane proteins.
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Affiliation(s)
- Laetitia Daury
- Université de Bordeaux, CBMN UMR 5248, Bordeaux INP, IECB, Pessac F-33600, France.,CNRS, CBMN UMR 5248, Pessac F-33600, France
| | - François Orange
- Université de Bordeaux, CBMN UMR 5248, Bordeaux INP, IECB, Pessac F-33600, France.,CNRS, CBMN UMR 5248, Pessac F-33600, France
| | - Jean-Christophe Taveau
- Université de Bordeaux, CBMN UMR 5248, Bordeaux INP, IECB, Pessac F-33600, France.,CNRS, CBMN UMR 5248, Pessac F-33600, France
| | - Alice Verchère
- Laboratoire de Cristallographie et RMN Biologiques, UMR 8015, CNRS, Université Paris Descartes, Faculté de Pharmacie, 4 Avenue de l'Observatoire, Paris 75006, France
| | - Laura Monlezun
- Laboratoire de Cristallographie et RMN Biologiques, UMR 8015, CNRS, Université Paris Descartes, Faculté de Pharmacie, 4 Avenue de l'Observatoire, Paris 75006, France
| | - Céline Gounou
- Université de Bordeaux, CBMN UMR 5248, Bordeaux INP, IECB, Pessac F-33600, France.,CNRS, CBMN UMR 5248, Pessac F-33600, France
| | - Ravi K R Marreddy
- Institute of Biochemistry, Goethe-University Frankfurt, Max-von-Laue-Str. 9, D-60438 Frankfurt am Main, Germany
| | - Martin Picard
- Laboratoire de Cristallographie et RMN Biologiques, UMR 8015, CNRS, Université Paris Descartes, Faculté de Pharmacie, 4 Avenue de l'Observatoire, Paris 75006, France
| | - Isabelle Broutin
- Laboratoire de Cristallographie et RMN Biologiques, UMR 8015, CNRS, Université Paris Descartes, Faculté de Pharmacie, 4 Avenue de l'Observatoire, Paris 75006, France
| | - Klaas M Pos
- Institute of Biochemistry, Goethe-University Frankfurt, Max-von-Laue-Str. 9, D-60438 Frankfurt am Main, Germany
| | - Olivier Lambert
- Université de Bordeaux, CBMN UMR 5248, Bordeaux INP, IECB, Pessac F-33600, France.,CNRS, CBMN UMR 5248, Pessac F-33600, France
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9
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Monlezun L, Phan G, Benabdelhak H, Lascombe MB, Enguéné VYN, Picard M, Broutin I. New OprM structure highlighting the nature of the N-terminal anchor. Front Microbiol 2015; 6:667. [PMID: 26191054 PMCID: PMC4486845 DOI: 10.3389/fmicb.2015.00667] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [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: 02/10/2015] [Accepted: 06/19/2015] [Indexed: 01/11/2023] Open
Abstract
Among the different mechanisms used by bacteria to resist antibiotics, active efflux plays a major role. In Gram-negative bacteria, active efflux is carried out by tripartite efflux pumps that form a macromolecular assembly spanning both membranes of the cellular wall. At the outer membrane level, a well-conserved outer membrane factor (OMF) protein acts as an exit duct, but its sequence varies greatly among different species. The OMFs share a similar tri-dimensional structure that includes a beta-barrel pore domain that stabilizes the channel within the membrane. In addition, OMFs are often subjected to different N-terminal post-translational modifications (PTMs), such as an acylation with a lipid. The role of additional N-terminal anchors is all the more intriguing since it is not always required among the OMFs family. Understanding this optional PTM could open new research lines in the field of antibiotics resistance. In Escherichia coli, it has been shown that CusC is modified with a tri-acylated lipid, whereas TolC does not show any modification. In the case of OprM from Pseudomonas aeruginosa, the N-terminal modification remains a matter of debate, therefore, we used several approaches to investigate this issue. As definitive evidence, we present a new X-ray structure at 3.8 Å resolution that was solved in a new space group, making it possible to model the N-terminal residue as a palmitoylated cysteine.
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Affiliation(s)
- Laura Monlezun
- Laboratoire de Cristallographie et RMN Biologiques, CNRS UMR 8015, Faculté de Pharmacie, Université Paris Descartes Paris, France
| | - Gilles Phan
- Laboratoire de Cristallographie et RMN Biologiques, CNRS UMR 8015, Faculté de Pharmacie, Université Paris Descartes Paris, France
| | - Houssain Benabdelhak
- Laboratoire d'Imagerie Biomédicale, Sorbonne Universités, Université Pierre et Marie Curie Paris 6, CNRS UMR 7371, INSERM U1146 Paris, France
| | - Marie-Bernard Lascombe
- Laboratoire de Cristallographie et RMN Biologiques, CNRS UMR 8015, Faculté de Pharmacie, Université Paris Descartes Paris, France
| | - Véronique Y N Enguéné
- Laboratoire de Cristallographie et RMN Biologiques, CNRS UMR 8015, Faculté de Pharmacie, Université Paris Descartes Paris, France
| | - Martin Picard
- Laboratoire de Cristallographie et RMN Biologiques, CNRS UMR 8015, Faculté de Pharmacie, Université Paris Descartes Paris, France
| | - Isabelle Broutin
- Laboratoire de Cristallographie et RMN Biologiques, CNRS UMR 8015, Faculté de Pharmacie, Université Paris Descartes Paris, France
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10
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Richardot C, Plésiat P, Fournier D, Monlezun L, Broutin I, Llanes C. Carbapenem resistance in cystic fibrosis strains of Pseudomonas aeruginosa as a result of amino acid substitutions in porin OprD. Int J Antimicrob Agents 2015; 45:529-32. [DOI: 10.1016/j.ijantimicag.2014.12.029] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2014] [Revised: 12/24/2014] [Accepted: 12/30/2014] [Indexed: 11/16/2022]
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11
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Monlezun L, Liebl D, Fenel D, Grandjean T, Berry A, Schoehn G, Dessein R, Faudry E, Attree I. PscI is a type III secretion needle anchoring protein within vitropolymerization capacities. Mol Microbiol 2015; 96:419-36. [DOI: 10.1111/mmi.12947] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/22/2015] [Indexed: 12/20/2022]
Affiliation(s)
- Laura Monlezun
- INSERM; UMR-S 1036; Biology of Cancer and Infection; Grenoble France
- CNRS; Bacterial Pathogenesis and Cellular Responses; ERL 5261 Grenoble France
- Université Grenoble Alpes; F-38041 Grenoble France
- CEA; DSV/iRTSV; F-38054 Grenoble France
| | - David Liebl
- INSERM; UMR-S 1036; Biology of Cancer and Infection; Grenoble France
- CNRS; Bacterial Pathogenesis and Cellular Responses; ERL 5261 Grenoble France
- Université Grenoble Alpes; F-38041 Grenoble France
- CEA; DSV/iRTSV; F-38054 Grenoble France
| | - Daphna Fenel
- Université Grenoble Alpes; Institut de Biologie Structurale (IBS); 71 avenue des Martyrs 38044 Grenoble France
- CNRS; IBS; F-38044 Grenoble France
- CEA; IBS; F-38044 Grenoble France
| | - Teddy Grandjean
- Groupe de Recherche Translationnelle de la Relation Hôte-Pathogène; Faculté de Médecine de l'Université de Lille; 59000 Lille France
| | - Alice Berry
- INSERM; UMR-S 1036; Biology of Cancer and Infection; Grenoble France
- CNRS; Bacterial Pathogenesis and Cellular Responses; ERL 5261 Grenoble France
- Université Grenoble Alpes; F-38041 Grenoble France
- CEA; DSV/iRTSV; F-38054 Grenoble France
| | - Guy Schoehn
- Université Grenoble Alpes; Institut de Biologie Structurale (IBS); 71 avenue des Martyrs 38044 Grenoble France
- CNRS; IBS; F-38044 Grenoble France
- CEA; IBS; F-38044 Grenoble France
- Unit for Virus Host Cell Interactions UMI 3265 (UJF-EMBL-CNRS); 38027 Grenoble France
| | - Rodrigue Dessein
- Groupe de Recherche Translationnelle de la Relation Hôte-Pathogène; Faculté de Médecine de l'Université de Lille; 59000 Lille France
| | - Eric Faudry
- INSERM; UMR-S 1036; Biology of Cancer and Infection; Grenoble France
- CNRS; Bacterial Pathogenesis and Cellular Responses; ERL 5261 Grenoble France
- Université Grenoble Alpes; F-38041 Grenoble France
- CEA; DSV/iRTSV; F-38054 Grenoble France
| | - Ina Attree
- INSERM; UMR-S 1036; Biology of Cancer and Infection; Grenoble France
- CNRS; Bacterial Pathogenesis and Cellular Responses; ERL 5261 Grenoble France
- Université Grenoble Alpes; F-38041 Grenoble France
- CEA; DSV/iRTSV; F-38054 Grenoble France
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Ferrandez Y, Monlezun L, Phan G, Benabdelhak H, Benas P, Ulryck N, Falson P, Ducruix A, Picard M, Broutin I. Stoichiometry of the MexA-OprM binding, as investigated by blue native gel electrophoresis. Electrophoresis 2012; 33:1282-7. [PMID: 22589107 DOI: 10.1002/elps.201100541] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Multidrug resistance has become a serious concern in the treatment of bacterial infections. A prominent role is ascribed to the active efflux of xenobiotics out of the bacteria by a tripartite protein machinery. The mechanism of drug extrusion is rather well understood, thanks to the X-ray structures obtained for the Escherichia coli TolC/AcrA/AcrB model system and the related Pseudomonas aeruginosa OprM/MexA/MexB. However, many questions remain unresolved, in particular the stoichiometry of the efflux pump assembly. On the basis of blue native polyacrylamide gel electrophoresis (BN-PAGE) (Wittig et al., Nat. Protoc. 2006, 1, 418-428), we analyzed the binding stoichiometry of both palmitylated and non-palmitylated MexA with the cognate partner OprM trimer at different ratios and detergent conditions. We found that β-octyl glucopyranoside (β-OG) detergent was not suitable for this technique. Then we proved that MexA has to be palmitylated in order to stabilized the complex formation with OprM. Finally, we provided evidence for a two by two (2, 4, 6, or upper) binding of palmitylated MexA per trimer of OprM.
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Affiliation(s)
- Yann Ferrandez
- Laboratoire de Cristallographie et RMN Biologiques, Faculté des Sciences Pharmaceutiques et Biologiques, Université Paris Descartes, Paris, France
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13
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Wang W, Monlezun L, Picard M, Benas P, Français O, Broutin I, Le Pioufle B. Activity monitoring of functional OprM using a biomimetic microfluidic device. Analyst 2012; 137:847-52. [PMID: 22215439 DOI: 10.1039/c2an16007b] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [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
This paper describes the fabrication and use of a biomimetic microfluidic device for the monitoring of a functional porin reconstituted within a miniaturized suspended artificial bilayer lipid membrane (BLM). Such a microfluidic device allows for (1) fluidic and electrical access to both sides of the BLM and (2) reproducible membrane protein insertion and long-term electrical monitoring of its conductance (G(i)), thanks to the miniaturization of the BLM. We demonstrate here for the first time the feasibility to insert a large trans-membrane protein through its β-barrel, and monitor its functional activity for more than 1 hour (limited by buffer evaporation). In this paper, we specifically used our device for the monitoring of OprM, a bacterial efflux channel involved in the multidrug resistance of the bacteria Pseudomonas aeruginosa. Sub-steps of the OprM channel conductance were detected during the electrical recordings within our device, which might be due to oscillations between several structural conformations (sub-states) adopted by the protein, as part of its opening mechanism. This work is a first step towards the establishment of a genuine platform dedicated to the investigation of bacterial proteins under reconstituted conditions, a very promising tool for the screening of new inhibitors against bacterial channels involved in drug resistance.
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Affiliation(s)
- Wei Wang
- SATIE, UMR 8029 CNRS, Ecole Normale Supérieure de Cachan, 61 Avenue du Président Wilson, 94235, Cachan Cedex, France
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14
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Eckert K, Saliou JM, Monlezun L, Vigouroux A, Atmane N, Caillat C, Quevillon-Chéruel S, Madiona K, Nicaise M, Lazereg S, Van Dorsselaer A, Sanglier-Cianférani S, Meyer P, Moréra S. The Pih1-Tah1 cochaperone complex inhibits Hsp90 molecular chaperone ATPase activity. J Biol Chem 2010; 285:31304-12. [PMID: 20663878 DOI: 10.1074/jbc.m110.138263] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.9] [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] Open
Abstract
Hsp90 (heat shock protein 90) is an ATP-dependent molecular chaperone regulated by collaborating proteins called cochaperones. This machinery is involved in the conformational activation of client proteins like signaling kinases, transcription factors, or ribonucleoproteins (RNP) such as telomerase. TPR (TetratricoPeptide Repeat)-containing protein associated with Hsp90 (Tah1) and protein interacting with Hsp90 (Pih1) have been identified in Saccharomyces cerevisiae as two Hsp90 cochaperones involved in chromatin remodeling complexes and small nucleolar RNP maturation. Tah1 possesses a minimal TPR domain and binds specifically to the Hsp90 C terminus, whereas Pih1 displays no homology to other protein motifs and has been involved in core RNP protein interaction. While Pih1 alone was unstable and was degraded from its N terminus, we showed that Pih1 and Tah1 form a stable heterodimeric complex that regulates Hsp90 ATPase activity. We used different biophysical approaches such as analytical ultracentrifugation, microcalorimetry, and noncovalent mass spectrometry to characterize the Pih1-Tah1 complex and its interaction with Hsp90. We showed that the Pih1-Tah1 heterodimer binds to Hsp90 with a similar affinity and the same stoichiometry as Tah1 alone. However, the Pih1-Tah1 complex antagonizes Tah1 activity on Hsp90 and inhibits the chaperone ATPase activity. We further identified the region within Pih1 responsible for interaction with Tah1 and inhibition of Hsp90, allowing us to suggest an interaction model for the Pih1-Tah1/Hsp90 complex. These results, together with previous reports, suggest a role for the Pih1-Tah1 cochaperone complex in the recruitment of client proteins such as core RNP proteins to Hsp90.
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Affiliation(s)
- Kelvin Eckert
- Laboratoire d'Enzymologie et Biochimie Structurales, CNRS, 91198 Gif-sur-Yvette, France
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