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Luizet JB, Raymond J, Lacerda TLS, Barbieux E, Kambarev S, Bonici M, Lembo F, Willemart K, Borg JP, Celli J, Gérard FCA, Muraille E, Gorvel JP, Salcedo SP. The Brucella effector BspL targets the ER-associated degradation (ERAD) pathway and delays bacterial egress from infected cells. Proc Natl Acad Sci U S A 2021; 118:e2105324118. [PMID: 34353909 PMCID: PMC8364137 DOI: 10.1073/pnas.2105324118] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Perturbation of the endoplasmic reticulum (ER), a central organelle of the cell, can have critical consequences for cellular homeostasis. An elaborate surveillance system known as ER quality control ensures that cells can respond and adapt to stress via the unfolded protein response (UPR) and that only correctly assembled proteins reach their destination. Interestingly, several bacterial pathogens hijack the ER to establish an infection. However, it remains poorly understood how bacterial pathogens exploit ER quality-control functions to complete their intracellular cycle. Brucella spp. replicate extensively within an ER-derived niche, which evolves into specialized vacuoles suited for exit from infected cells. Here we present Brucella-secreted protein L (BspL), a Brucella abortus effector that interacts with Herp, a central component of the ER-associated degradation (ERAD) machinery. We found that BspL enhances ERAD at the late stages of the infection. BspL targeting of Herp and ERAD allows tight control of the kinetics of autophagic Brucella-containing vacuole formation, delaying the last step of its intracellular cycle and cell-to-cell spread. This study highlights a mechanism by which a bacterial pathogen hijacks ERAD components for fine regulation of its intracellular trafficking.
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Affiliation(s)
- Jean-Baptiste Luizet
- Laboratory of Molecular Microbiology and Structural Biochemistry, CNRS UMR5086, Université de Lyon, 69367 Lyon, France
| | - Julie Raymond
- Laboratory of Molecular Microbiology and Structural Biochemistry, CNRS UMR5086, Université de Lyon, 69367 Lyon, France
| | - Thais Lourdes Santos Lacerda
- Laboratory of Molecular Microbiology and Structural Biochemistry, CNRS UMR5086, Université de Lyon, 69367 Lyon, France
| | - Emeline Barbieux
- Department of Biology, Research Unit in Microorganisms Biology, Namur Research Institute for Life Sciences, 5000 Namur, Belgium
- Laboratory of Parasitology, Université Libre de Bruxelles Centre for Research in Immunology (UCRI), Université Libre de Bruxelles, 6041 Gosselies, Belgium
| | - Stanimir Kambarev
- Paul G. Allen School for Global Animal Health, Washington State University, Pullman, WA 99164
| | - Magali Bonici
- Laboratory of Molecular Microbiology and Structural Biochemistry, CNRS UMR5086, Université de Lyon, 69367 Lyon, France
| | - Frédérique Lembo
- Equipe labellisée Ligue 'Cell Polarity, Cell Signaling and Cancer', Centre de Recherche en Cancérologie de Marseille, Institut Paoli-Calmettes, Aix-Marseille Université, CNRS, INSERM, 13009 Marseille, France
| | - Kévin Willemart
- Department of Biology, Research Unit in Microorganisms Biology, Namur Research Institute for Life Sciences, 5000 Namur, Belgium
| | - Jean-Paul Borg
- Equipe labellisée Ligue 'Cell Polarity, Cell Signaling and Cancer', Centre de Recherche en Cancérologie de Marseille, Institut Paoli-Calmettes, Aix-Marseille Université, CNRS, INSERM, 13009 Marseille, France
- Institut Universitaire de France, 75231 Paris, France
| | - Jean Celli
- Paul G. Allen School for Global Animal Health, Washington State University, Pullman, WA 99164
| | - Francine C A Gérard
- Laboratory of Molecular Microbiology and Structural Biochemistry, CNRS UMR5086, Université de Lyon, 69367 Lyon, France
| | - Eric Muraille
- Department of Biology, Research Unit in Microorganisms Biology, Namur Research Institute for Life Sciences, 5000 Namur, Belgium
- Laboratory of Parasitology, Université Libre de Bruxelles Centre for Research in Immunology (UCRI), Université Libre de Bruxelles, 6041 Gosselies, Belgium
| | - Jean-Pierre Gorvel
- Centre d'Immunologie de Marseille-Luminy, CNRS, INSERM, Aix-Marseille Université, 13009 Marseille, France
| | - Suzana P Salcedo
- Laboratory of Molecular Microbiology and Structural Biochemistry, CNRS UMR5086, Université de Lyon, 69367 Lyon, France;
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Nicol M, Alexandre S, Luizet JB, Skogman M, Jouenne T, Salcedo SP, Dé E. Unsaturated Fatty Acids Affect Quorum Sensing Communication System and Inhibit Motility and Biofilm Formation of Acinetobacter baumannii. Int J Mol Sci 2018; 19:ijms19010214. [PMID: 29320462 PMCID: PMC5796163 DOI: 10.3390/ijms19010214] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2017] [Revised: 01/07/2018] [Accepted: 01/08/2018] [Indexed: 02/07/2023] Open
Abstract
The increasing threat of Acinetobacter baumannii as a nosocomial pathogen is mainly due to the occurrence of multidrug-resistant strains that are associated with the real problem of its eradication from hospital wards. The particular ability of this pathogen to form biofilms contributes to its persistence, increases antibiotic resistance, and promotes persistent/device-related infections. We previously demonstrated that virstatin, which is a small organic compound known to decrease virulence of Vibrio cholera via an inhibition of T4-pili expression, displayed very promising activity to prevent A. baumannii biofilm development. Here, we examined the antibiofilm activity of mono-unsaturated chain fatty acids, palmitoleic (PoA), and myristoleic (MoA) acids, presenting similar action on V. cholerae virulence. We demonstrated that PoA and MoA (at 0.02 mg/mL) were able to decrease A. baumannii ATCC 17978 biofilm formation up to 38% and 24%, respectively, presented a biofilm dispersing effect and drastically reduced motility. We highlighted that these fatty acids decreased the expression of the regulator abaR from the LuxIR-type quorum sensing (QS) communication system AbaIR and consequently reduced the N-acyl-homoserine lactone production (AHL). This effect can be countered by addition of exogenous AHLs. Besides, fatty acids may have additional non-targeted effects, independent from QS. Atomic force microscopy experiments probed indeed that PoA and MoA could also act on the initial adhesion process in modifying the material interface properties. Evaluation of fatty acids effect on 22 clinical isolates showed a strain-dependent antibiofilm activity, which was not correlated to hydrophobicity or pellicle formation ability of the tested strains, and suggested a real diversity in cell-to-cell communication systems involved in A. baumannii biofilm formation.
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Affiliation(s)
- Marion Nicol
- Normandie University, Unirouen, 76000 Rouen, France.
- CNRS, UMR 6270, Polymers, Biopolymers, Surfaces Laboratory, F-76821 Mont-Saint-Aignan, France.
| | - Stéphane Alexandre
- Normandie University, Unirouen, 76000 Rouen, France.
- CNRS, UMR 6270, Polymers, Biopolymers, Surfaces Laboratory, F-76821 Mont-Saint-Aignan, France.
| | - Jean-Baptiste Luizet
- Laboratory of Molecular Microbiology and Structural Biochemistry, University of Lyon, Centre National de la Recherche Scientifique, F-69367 Lyon, France.
| | - Malena Skogman
- Department of Pharmaceutical Biosciences, Faculty of Pharmacy, University of Helsinki, Viikinkaari 5E, FI-00014 Helsinki, Finland.
| | - Thierry Jouenne
- Normandie University, Unirouen, 76000 Rouen, France.
- CNRS, UMR 6270, Polymers, Biopolymers, Surfaces Laboratory, F-76821 Mont-Saint-Aignan, France.
| | - Suzana P Salcedo
- Laboratory of Molecular Microbiology and Structural Biochemistry, University of Lyon, Centre National de la Recherche Scientifique, F-69367 Lyon, France.
| | - Emmanuelle Dé
- Normandie University, Unirouen, 76000 Rouen, France.
- CNRS, UMR 6270, Polymers, Biopolymers, Surfaces Laboratory, F-76821 Mont-Saint-Aignan, France.
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Imbert PR, Louche A, Luizet JB, Grandjean T, Bigot S, Wood TE, Gagné S, Blanco A, Wunderley L, Terradot L, Woodman P, Garvis S, Filloux A, Guery B, Salcedo SP. A Pseudomonas aeruginosa TIR effector mediates immune evasion by targeting UBAP1 and TLR adaptors. EMBO J 2017; 36:1869-1887. [PMID: 28483816 PMCID: PMC5494471 DOI: 10.15252/embj.201695343] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [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: 07/27/2016] [Revised: 03/29/2017] [Accepted: 04/05/2017] [Indexed: 12/11/2022] Open
Abstract
Bacterial pathogens often subvert the innate immune system to establish a successful infection. The direct inhibition of downstream components of innate immune pathways is particularly well documented but how bacteria interfere with receptor proximal events is far less well understood. Here, we describe a Toll/interleukin 1 receptor (TIR) domain‐containing protein (PumA) of the multi‐drug resistant Pseudomonas aeruginosa PA7 strain. We found that PumA is essential for virulence and inhibits NF‐κB, a property transferable to non‐PumA strain PA14, suggesting no additional factors are needed for PumA function. The TIR domain is able to interact with the Toll‐like receptor (TLR) adaptors TIRAP and MyD88, as well as the ubiquitin‐associated protein 1 (UBAP1), a component of the endosomal‐sorting complex required for transport I (ESCRT‐I). These interactions are not spatially exclusive as we show UBAP1 can associate with MyD88, enhancing its plasma membrane localization. Combined targeting of UBAP1 and TLR adaptors by PumA impedes both cytokine and TLR receptor signalling, highlighting a novel strategy for innate immune evasion.
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Affiliation(s)
- Paul Rc Imbert
- Laboratory of Molecular Microbiology and Structural Biochemistry, Centre National de la Recherche Scientifique, University of Lyon, Lyon, France
| | - Arthur Louche
- Laboratory of Molecular Microbiology and Structural Biochemistry, Centre National de la Recherche Scientifique, University of Lyon, Lyon, France
| | - Jean-Baptiste Luizet
- Laboratory of Molecular Microbiology and Structural Biochemistry, Centre National de la Recherche Scientifique, University of Lyon, Lyon, France
| | - Teddy Grandjean
- EA 7366 Recherche Translationelle Relations Hôte-Pathogènes, Faculté de Médecine Pôle Recherche, Université Lille 2, Lille, France
| | - Sarah Bigot
- Laboratory of Molecular Microbiology and Structural Biochemistry, Centre National de la Recherche Scientifique, University of Lyon, Lyon, France
| | - Thomas E Wood
- MRC Centre for Molecular Bacteriology and Infection, Imperial College London, London, UK
| | - Stéphanie Gagné
- Laboratory of Molecular Microbiology and Structural Biochemistry, Centre National de la Recherche Scientifique, University of Lyon, Lyon, France
| | - Amandine Blanco
- Laboratory of Molecular Microbiology and Structural Biochemistry, Centre National de la Recherche Scientifique, University of Lyon, Lyon, France
| | - Lydia Wunderley
- School of Biological Sciences, Faculty of Biology Medicine and Health University of Manchester Manchester Academic Health Science Centre, Manchester, UK†
| | - Laurent Terradot
- Laboratory of Molecular Microbiology and Structural Biochemistry, Centre National de la Recherche Scientifique, University of Lyon, Lyon, France
| | - Philip Woodman
- School of Biological Sciences, Faculty of Biology Medicine and Health University of Manchester Manchester Academic Health Science Centre, Manchester, UK†
| | - Steve Garvis
- Laboratoire de Biologie et Modelisation, Ecole Normal Supérieur, UMR5239, Lyon, France
| | - Alain Filloux
- MRC Centre for Molecular Bacteriology and Infection, Imperial College London, London, UK
| | - Benoit Guery
- EA 7366 Recherche Translationelle Relations Hôte-Pathogènes, Faculté de Médecine Pôle Recherche, Université Lille 2, Lille, France
| | - Suzana P Salcedo
- Laboratory of Molecular Microbiology and Structural Biochemistry, Centre National de la Recherche Scientifique, University of Lyon, Lyon, France
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