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Nottelet P, Bataille L, Gourgues G, Anger R, Lartigue C, Sirand-Pugnet P, Marza E, Fronzes R, Arfi Y. The mycoplasma surface proteins MIB and MIP promote the dissociation of the antibody-antigen interaction. Sci Adv 2021; 7:7/10/eabf2403. [PMID: 33674316 PMCID: PMC7935358 DOI: 10.1126/sciadv.abf2403] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2020] [Accepted: 01/22/2021] [Indexed: 05/04/2023]
Abstract
Mycoplasma immunoglobulin binding (MIB) and mycoplasma immunoglobulin protease (MIP) are surface proteins found in the majority of mycoplasma species, acting sequentially to capture antibodies and cleave off their VH domains. Cryo-electron microscopy structures show how MIB and MIP bind to a Fab fragment in a "hug of death" mechanism. As a result, the orientation of the VL and VH domains is twisted out of alignment, disrupting the antigen binding site. We also show that MIB-MIP has the ability to promote the dissociation of the antibody-antigen complex. This system is functional in cells and protects mycoplasmas from antibody-mediated agglutination. These results highlight the key role of the MIB-MIP system in immunity evasion by mycoplasmas through an unprecedented mechanism, and open exciting perspectives to use these proteins as potential tools in the antibody field.
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Affiliation(s)
- Pierre Nottelet
- Structure and Function of Bacterial Nanomachines, UMR 5234, Univ. Bordeaux, CNRS, Institut Européen de Chimie et Biologie, F-33600 Pessac, France
| | - Laure Bataille
- Univ. Bordeaux, INRAE, Biologie du Fruit et Pathologie, UMR 1332, F-33140 Villenave d'Ornon, France
| | - Geraldine Gourgues
- Univ. Bordeaux, INRAE, Biologie du Fruit et Pathologie, UMR 1332, F-33140 Villenave d'Ornon, France
| | - Robin Anger
- Structure and Function of Bacterial Nanomachines, UMR 5234, Univ. Bordeaux, CNRS, Institut Européen de Chimie et Biologie, F-33600 Pessac, France
| | - Carole Lartigue
- Univ. Bordeaux, INRAE, Biologie du Fruit et Pathologie, UMR 1332, F-33140 Villenave d'Ornon, France
| | - Pascal Sirand-Pugnet
- Univ. Bordeaux, INRAE, Biologie du Fruit et Pathologie, UMR 1332, F-33140 Villenave d'Ornon, France
| | - Esther Marza
- Structure and Function of Bacterial Nanomachines, UMR 5234, Univ. Bordeaux, CNRS, Institut Européen de Chimie et Biologie, F-33600 Pessac, France
| | - Remi Fronzes
- Structure and Function of Bacterial Nanomachines, UMR 5234, Univ. Bordeaux, CNRS, Institut Européen de Chimie et Biologie, F-33600 Pessac, France.
| | - Yonathan Arfi
- Univ. Bordeaux, INRAE, Biologie du Fruit et Pathologie, UMR 1332, F-33140 Villenave d'Ornon, France.
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Marza E, Taouji S, Barroso K, Raymond AA, Guignard L, Bonneu M, Pallares-Lupon N, Dupuy JW, Fernandez-Zapico ME, Rosenbaum J, Palladino F, Dupuy D, Chevet E. Genome-wide screen identifies a novel p97/CDC-48-dependent pathway regulating ER-stress-induced gene transcription. EMBO Rep 2015; 16:332-40. [PMID: 25652260 DOI: 10.15252/embr.201439123] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
The accumulation of misfolded proteins in the endoplasmic reticulum (ER) activates the Unfolded Protein Response (UPR(ER)) to restore ER homeostasis. The AAA(+) ATPase p97/CDC-48 plays key roles in ER stress by promoting both ER protein degradation and transcription of UPR(ER) genes. Although the mechanisms associated with protein degradation are now well established, the molecular events involved in the regulation of gene transcription by p97/CDC-48 remain unclear. Using a reporter-based genome-wide RNAi screen in combination with quantitative proteomic analysis in Caenorhabditis elegans, we have identified RUVB-2, a AAA(+) ATPase, as a novel repressor of a subset of UPR(ER) genes. We show that degradation of RUVB-2 by CDC-48 enhances expression of ER stress response genes through an XBP1-dependent mechanism. The functional interplay between CDC-48 and RUVB-2 in controlling transcription of select UPR(ER) genes appears conserved in human cells. Together, these results describe a novel role for p97/CDC-48, whereby its role in protein degradation is integrated with its role in regulating expression of ER stress response genes.
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Affiliation(s)
- Esther Marza
- Team "Endoplasmic Reticulum stress and cancer", INSERM, UMR1053, Bordeaux, France University of Bordeaux, Bordeaux, France ARNA laboratory, INSERM U869, Bordeaux, France
| | - Saïd Taouji
- Team "Endoplasmic Reticulum stress and cancer", INSERM, UMR1053, Bordeaux, France University of Bordeaux, Bordeaux, France
| | - Kim Barroso
- Team "Endoplasmic Reticulum stress and cancer", INSERM, UMR1053, Bordeaux, France University of Bordeaux, Bordeaux, France
| | - Anne-Aurélie Raymond
- University of Bordeaux, Bordeaux, France "REPTeam", INSERM, UMR1053, Bordeaux, France
| | - Léo Guignard
- University of Bordeaux, Bordeaux, France ARNA laboratory, INSERM U869, Bordeaux, France
| | - Marc Bonneu
- University of Bordeaux, Bordeaux, France Plateforme Proteome, Bordeaux, France
| | - Néstor Pallares-Lupon
- Team "Endoplasmic Reticulum stress and cancer", INSERM, UMR1053, Bordeaux, France University of Bordeaux, Bordeaux, France
| | - Jean-William Dupuy
- University of Bordeaux, Bordeaux, France Plateforme Proteome, Bordeaux, France
| | - Martin E Fernandez-Zapico
- Schulze Center for Novel Therapeutics, Division of Oncology Research, Mayo Clinic, Rochester, MN, USA
| | - Jean Rosenbaum
- University of Bordeaux, Bordeaux, France "REPTeam", INSERM, UMR1053, Bordeaux, France
| | - Francesca Palladino
- Laboratory of Molecular and Cellular Biology, Ecole Normale Supérieure, CNRS UMR5239 Université de Lyon, Lyon Cedex 07, France
| | - Denis Dupuy
- University of Bordeaux, Bordeaux, France ARNA laboratory, INSERM U869, Bordeaux, France
| | - Eric Chevet
- Team "Endoplasmic Reticulum stress and cancer", INSERM, UMR1053, Bordeaux, France University of Bordeaux, Bordeaux, France Centre Régional de Lutte Contre le Cancer Eugène Marquis, Rennes, France
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Fessart D, Marza E, Taouji S, Delom F, Chevet E. P97/CDC-48: proteostasis control in tumor cell biology. Cancer Lett 2013; 337:26-34. [PMID: 23726843 DOI: 10.1016/j.canlet.2013.05.030] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [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: 02/08/2013] [Revised: 05/16/2013] [Accepted: 05/23/2013] [Indexed: 12/17/2022]
Abstract
P97/CDC-48 is a prominent member of a highly evolutionary conserved Walker cassette - containing AAA+ATPases. It has been involved in numerous cellular processes ranging from the control of protein homeostasis to membrane trafficking through the intervention of specific accessory proteins. Expression of p97/CDC-48 in cancers has been correlated with tumor aggressiveness and prognosis, however the precise underlying molecular mechanisms remain to be characterized. Moreover p97/CDC-48 inhibitors were developed and are currently under intense investigation as anticancer drugs. Herein, we discuss the role of p97/CDC-48 in cancer development and its therapeutic potential in tumor cell biology.
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Yi P, Higa A, Taouji S, Bexiga MG, Marza E, Arma D, Castain C, Le Bail B, Simpson JC, Rosenbaum J, Balabaud C, Bioulac-Sage P, Blanc JF, Chevet E. Sorafenib-Mediated Targeting of the AAA+ ATPase p97/VCP Leads to Disruption of the Secretory Pathway, Endoplasmic Reticulum Stress, and Hepatocellular Cancer Cell Death. Mol Cancer Ther 2012; 11:2610-20. [DOI: 10.1158/1535-7163.mct-12-0516] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Marza E, Simonsen KT, Færgeman NJ, Lesa GM. Expression of ceramide glucosyltransferases, which are essential for glycosphingolipid synthesis, is only required in a small subset of C. elegans cells. J Cell Sci 2009. [DOI: 10.1242/jcs.052928] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Marza E, Simonsen KT, Faergeman NJ, Lesa GM. Expression of ceramide glucosyltransferases, which are essential for glycosphingolipid synthesis, is only required in a small subset of C. elegans cells. J Cell Sci 2009; 122:822-33. [PMID: 19240113 DOI: 10.1242/jcs.042754] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Glycosphingolipids (GSLs) are glycosylated derivatives of ceramide in the lipid bilayer. Their ubiquitous distribution and complexity suggest that they have important functions, but what these are in vivo is still poorly understood. Here, we characterize the phenotype of Caenorhabditis elegans mutants with essentially no GSLs. The C. elegans genome encodes three ceramide glucosyltransferase (CGT) genes, which encode enzymes required for GSL biosynthesis. Animals lacking CGT do not synthesize GSLs, arrest growth at the first larval stage, and display defects in a subset of cells in their digestive tract; these defects impair larval feeding, resulting in a starvation-induced growth arrest. Restoring CGT function in these digestive tract cells - but not in a variety of other tissues - is sufficient to rescue the phenotypes associated with loss of CGT function. These unexpected findings suggest that GSLs are dispensable in most C. elegans cells, including those of the nervous system.
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Affiliation(s)
- Esther Marza
- MRC Laboratory for Molecular Cell Biology, University College London, Gower Street, London WC1E 6BT, UK
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Marza E, Long T, Saiardi A, Sumakovic M, Eimer S, Hall DH, Lesa GM. Polyunsaturated fatty acids influence synaptojanin localization to regulate synaptic vesicle recycling. Mol Biol Cell 2007; 19:833-42. [PMID: 18094048 DOI: 10.1091/mbc.e07-07-0719] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
The lipid polyunsaturated fatty acids are highly enriched in synaptic membranes, including synaptic vesicles, but their precise function there is unknown. Caenorhabditis elegans fat-3 mutants lack long-chain polyunsaturated fatty acids (LC-PUFAs); they release abnormally low levels of serotonin and acetylcholine and are depleted of synaptic vesicles, but the mechanistic basis of these defects is unclear. Here we demonstrate that synaptic vesicle endocytosis is impaired in the mutants: the synaptic vesicle protein synaptobrevin is not efficiently retrieved after synaptic vesicles fuse with the presynaptic membrane, and the presynaptic terminals contain abnormally large endosomal-like compartments and synaptic vesicles. Moreover, the mutants have abnormally low levels of the phosphoinositide phosphatase synaptojanin at release sites and accumulate the main synaptojanin substrate phosphatidylinositol 4,5-bisphosphate at these sites. Both synaptobrevin and synaptojanin mislocalization can be rescued by providing exogenous arachidonic acid, an LC-PUFA, suggesting that the endocytosis defect is caused by LC-PUFA depletion. By showing that the genes fat-3 and synaptojanin act in the same endocytic pathway at synapses, our findings suggest that LC-PUFAs are required for efficient synaptic vesicle recycling, probably by modulating synaptojanin localization at synapses.
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Affiliation(s)
- Esther Marza
- MRC Laboratory for Molecular Cell Biology, University College London, London, WC1E 6BT, United Kingdom
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Lesa G, Marza E, Long T, Hall D. The role of polyunsaturated fatty acids at presynaptic terminals. Comp Biochem Physiol A Mol Integr Physiol 2007. [DOI: 10.1016/j.cbpa.2007.01.169] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Abstract
Changes in PUFA (polyunsaturated fatty acid) metabolism can cause mental retardation and cognitive impairment. However, it is still unclear why altered levels of PUFAs result in neuronal dysfunction. Recent studies on the nematode Caenorhabditis elegans suggest that PUFA depletion may cause cognitive impairment by compromising communication among neurons. Pharmacological and electrophysiological experiments showed that animals devoid of most PUFAs release abnormally low levels of neurotransmitters. In addition, ultrastructural analysis revealed that synapses in these mutants are severely depleted of synaptic vesicles. The conclusion of these studies is that PUFAs are required to maintain a normal pool of synaptic vesicles at pre-synaptic sites, thus ensuring efficient neurotransmission.
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Affiliation(s)
- E Marza
- MRC Laboratory for Molecular Cell Biology, University College London, Gower Street, London WC1E 6BT, UK
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Marza E, Barthe C, André M, Villeneuve L, Hélou C, Babin PJ. Developmental expression and nutritional regulation of a zebrafish gene homologous to mammalian microsomal triglyceride transfer protein large subunit. Dev Dyn 2005; 232:506-18. [PMID: 15614773 DOI: 10.1002/dvdy.20251] [Citation(s) in RCA: 71] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
The microsomal triglyceride transfer protein (MTP) large subunit is required for the assembly and secretion of apolipoprotein B-containing lipoproteins. We have found a zebrafish mtp homologous gene coding a protein with 54% identity with human MTP large subunit with the most conserved regions distributed in the corresponding predicted alpha-helical and C- and A-sheet domains. In situ hybridizations showed that zebrafish mtp transcripts were distributed in the yolk syncytial layer during early embryogenesis and in anterior intestine and liver from 48 hr postfertilization onward. Real-time quantitative RT-PCR confirmed the developmental regulation and tissue-specificity of mtp expression. A significant pretranslational up-regulation of mtp expression was observed in the anterior intestine after feeding. The nutritional regulation of zebrafish mtp expression observed in the anterior intestine supports the notion that this protein, similar to mammalian MTP large subunit, could be a factor implicated directly or indirectly in large lipid droplets accumulation observed in the fish enterocyte after feeding.
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Affiliation(s)
- Esther Marza
- Laboratoire Génomique et Physiologie des Poissons, UMR 1067 NUAGE INRA-IFREMER, Université Bordeaux 1, 33405 Talence Cedex, France
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Camougrand N, Grelaud-Coq A, Marza E, Priault M, Bessoule JJ, Manon S. The product of the UTH1 gene, required for Bax-induced cell death in yeast, is involved in the response to rapamycin. Mol Microbiol 2003; 47:495-506. [PMID: 12519199 DOI: 10.1046/j.1365-2958.2003.03311.x] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
A yeast mutant was isolated that was resistant to Bax-induced cell death. It supports a mutation leading to decreased amounts of the protein Uth1p. A strain in which the UTH1 gene is disrupted also exhibits resistance to Bax expression. The absence of Uth1p does not change the mitochondrial localization of Bax, its insertion in the mitochondrial outer membrane or its cytochrome c-releasing activity. On the other hand, the absence of Uth1p does prevent the appearance of other hallmarks related to Bax expression in yeast, such as oxidation of mitochondrial lipid, production of reactive oxygen species and maintenance of plasma membrane properties after ethanol stress. The absence of Uth1p was also found to induce resistance to rapamycin, a specific inducer of autophagy. This resistance only appears when cells are grown under respiratory conditions, but not under fermentative conditions, suggesting that Uth1p acts in an autophagic pathway involving mitochondria, in accordance with its main localization in the outer mitochondrial membrane. Taken together, these data show that Bax is able to activate a death pathway related to autophagy in yeast, which also exhibits typical hallmarks of apoptosis, revealing a possible dual function of Bax in both types of death. This hypothesis is discussed in the light of observations suggesting a co-regulation of apoptosis and autophagy in mammalian cells.
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Abstract
The mechanism by which the expression of pro-apoptotic protein Bax is able to kill yeast was investigated. Ethanol stress induces a permeabilization of the plasma membrane revealed by propidium iodide accumulation. Bax expression, although killing yeast cells, prevents this permeabilization. These effects are modulated by aeration, by manipulation of the unsaturation index of fatty acids and by addition of resveratrol, a known inhibitor of lipid oxidation. These data suggest that lipid oxidation is involved in Bax effects. Taken together, these data show for the first time a direct effect of Bax on plasma membrane permeability properties and suggest that yeast is a powerful tool for investigating the molecular mechanisms underlying this process.
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Affiliation(s)
- Esther Marza
- UMR5095 C.N.R.S./Université de Bordeaux 2, France
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Oeriu S, Marza E, Cimpeanu R, Dumitrasc N, Bageacu V. [The accummulation of disulfide groups, a sign of pathological hormone relationship in bovine sterility. 1]. Zentralbl Veterinarmed A 1969; 16:927-31. [PMID: 4990739] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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