1
|
Al Awabdh S, Donneger F, Goutierre M, Séveno M, Vigy O, Weinzettl P, Russeau M, Moutkine I, Lévi S, Marin P, Poncer JC. Gephyrin Interacts with the K-Cl Cotransporter KCC2 to Regulate Its Surface Expression and Function in Cortical Neurons. J Neurosci 2022; 42:166-182. [PMID: 34810232 PMCID: PMC8802937 DOI: 10.1523/jneurosci.2926-20.2021] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [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: 11/17/2020] [Revised: 08/31/2021] [Accepted: 10/17/2021] [Indexed: 11/21/2022] Open
Abstract
The K+-Cl- cotransporter KCC2, encoded by the Slc12a5 gene, is a neuron-specific chloride extruder that tunes the strength and polarity of GABAA receptor-mediated transmission. In addition to its canonical ion transport function, KCC2 also regulates spinogenesis and excitatory synaptic function through interaction with a variety of molecular partners. KCC2 is enriched in the vicinity of both glutamatergic and GABAergic synapses, the activity of which in turn regulates its membrane stability and function. KCC2 interaction with the submembrane actin cytoskeleton via 4.1N is known to control its anchoring near glutamatergic synapses on dendritic spines. However, the molecular determinants of KCC2 clustering near GABAergic synapses remain unknown. Here, we used proteomics to identify novel KCC2 interacting proteins in the adult rat neocortex. We identified both known and novel candidate KCC2 partners, including some involved in neuronal development and synaptic transmission. These include gephyrin, the main scaffolding molecule at GABAergic synapses. Gephyrin interaction with endogenous KCC2 was confirmed by immunoprecipitation from rat neocortical extracts. We showed that gephyrin stabilizes plasmalemmal KCC2 and promotes its clustering in hippocampal neurons, mostly but not exclusively near GABAergic synapses, thereby controlling KCC2-mediated chloride extrusion. This study identifies gephyrin as a novel KCC2 anchoring molecule that regulates its membrane expression and function in cortical neurons.SIGNIFICANCE STATEMENT Fast synaptic inhibition in the brain is mediated by chloride-permeable GABAA receptors (GABAARs) and therefore relies on transmembrane chloride gradients. In neurons, these gradients are primarily maintained by the K/Cl cotransporter KCC2. Therefore, understanding the mechanisms controlling KCC2 expression and function is crucial to understand its physiological regulation and rescue its function in the pathology. KCC2 function depends on its membrane expression and clustering, but the underlying mechanisms remain unknown. We describe the interaction between KCC2 and gephyrin, the main scaffolding protein at inhibitory synapses. We show that gephyrin controls plasmalemmal KCC2 clustering and that loss of gephyrin compromises KCC2 function. Our data suggest functional units comprising GABAARs, gephyrin, and KCC2 act to regulate synaptic GABA signaling.
Collapse
Affiliation(s)
- Sana Al Awabdh
- INSERM UMR-S 1270, 75005 Paris, France
- Sorbonne Université, 75005 Paris, France
- Institut du Fer à Moulin, 75005 Paris, France
| | - Florian Donneger
- INSERM UMR-S 1270, 75005 Paris, France
- Sorbonne Université, 75005 Paris, France
- Institut du Fer à Moulin, 75005 Paris, France
| | - Marie Goutierre
- INSERM UMR-S 1270, 75005 Paris, France
- Sorbonne Université, 75005 Paris, France
- Institut du Fer à Moulin, 75005 Paris, France
| | - Martial Séveno
- BCM, Université de Montpellier, CNRS, INSERM, 34094 Montpellier, France
| | - Oana Vigy
- IGF, Université de Montpellier, CNRS, INSERM, 34090 Montpellier, France
| | - Pauline Weinzettl
- INSERM UMR-S 1270, 75005 Paris, France
- Sorbonne Université, 75005 Paris, France
- Institut du Fer à Moulin, 75005 Paris, France
- Institute of Biotechnology, University of Applied Sciences, Krems, Austria
| | - Marion Russeau
- INSERM UMR-S 1270, 75005 Paris, France
- Sorbonne Université, 75005 Paris, France
- Institut du Fer à Moulin, 75005 Paris, France
| | - Imane Moutkine
- INSERM UMR-S 1270, 75005 Paris, France
- Sorbonne Université, 75005 Paris, France
- Institut du Fer à Moulin, 75005 Paris, France
| | - Sabine Lévi
- INSERM UMR-S 1270, 75005 Paris, France
- Sorbonne Université, 75005 Paris, France
- Institut du Fer à Moulin, 75005 Paris, France
| | - Philippe Marin
- IGF, Université de Montpellier, CNRS, INSERM, 34090 Montpellier, France
| | - Jean Christophe Poncer
- INSERM UMR-S 1270, 75005 Paris, France
- Sorbonne Université, 75005 Paris, France
- Institut du Fer à Moulin, 75005 Paris, France
| |
Collapse
|
2
|
Pissarra J, Pagniez J, Petitdidier E, Séveno M, Vigy O, Bras-Gonçalves R, Lemesre JL, Holzmuller P. Proteomic Analysis of the Promastigote Secretome of Seven Leishmania Species. J Proteome Res 2021; 21:30-48. [PMID: 34806897 DOI: 10.1021/acs.jproteome.1c00244] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [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: 11/30/2022]
Abstract
Leishmaniasis is one of the most impactful parasitic diseases worldwide, endangering the lives of 1 billion people every year. There are 20 different species of Leishmania able to infect humans, causing cutaneous (CL), visceral (VL), and/or mucocutaneous leishmaniasis (MCL). Leishmania parasites are known to secrete a plethora of proteins to establish infection and modulate the host's immune system. In this study, we analyzed using tandem mass spectrometry the total protein content of the secretomes produced by promastigote forms from seven Leishmania species grown in serum-free in vitro cultures. The core secretome shared by all seven Leishmania species corresponds to up to one-third of total secreted proteins, suggesting conserved mechanisms of adaptation to the vertebrate host. The relative abundance confirms the importance of known virulence factors and some proteins uniquely present in CL- or VL-causing species and may provide further insight regarding their pathogenesis. Bioinformatic analysis showed that most proteins were secreted via unconventional mechanisms, with an important role for vesicle-based secretion for all species. Gene Ontology annotation and enrichment analyses showed a high level of functional conservation among species. This study contributes to the current knowledge on the biological significance of differently secreted proteins and provides new information on the correlation of Leishmania secretome to clinical outcomes and species-specific pathogenesis.
Collapse
Affiliation(s)
- Joana Pissarra
- UMR 177 INTERTRYP, Institut de Recherche pour le Développement (IRD), 34394 Montpellier, France
| | - Julie Pagniez
- UMR 177 INTERTRYP, Institut de Recherche pour le Développement (IRD), 34394 Montpellier, France
| | - Elodie Petitdidier
- UMR 177 INTERTRYP, Institut de Recherche pour le Développement (IRD), 34394 Montpellier, France
| | - Martial Séveno
- BCM, Univ. Montpellier, CNRS, INSERM, 34090 Montpellier, France
| | - Oana Vigy
- IGF, Univ. Montpellier, CNRS, INSERM, 34090 Montpellier, France
| | - Rachel Bras-Gonçalves
- UMR 177 INTERTRYP, Institut de Recherche pour le Développement (IRD), 34394 Montpellier, France
| | - Jean-Loup Lemesre
- UMR 177 INTERTRYP, Institut de Recherche pour le Développement (IRD), 34394 Montpellier, France
| | - Philippe Holzmuller
- UMR ASTRE, CIRAD, INRAE, University of Montpellier (I-MUSE), 34090 Montpellier, France
| |
Collapse
|
3
|
Toullec D, Elías-Villalobos A, Faux C, Noly A, Lledo G, Séveno M, Helmlinger D. The Hsp90 cochaperone TTT promotes cotranslational maturation of PIKKs prior to complex assembly. Cell Rep 2021; 37:109867. [PMID: 34686329 DOI: 10.1016/j.celrep.2021.109867] [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] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Revised: 07/30/2021] [Accepted: 09/30/2021] [Indexed: 01/28/2023] Open
Abstract
Phosphatidylinositol 3-kinase-related kinases (PIKKs) are a family of kinases that control fundamental processes, including cell growth, DNA damage repair, and gene expression. Although their regulation and activities are well characterized, little is known about how PIKKs fold and assemble into active complexes. Previous work has identified a heat shock protein 90 (Hsp90) cochaperone, the TTT complex, that specifically stabilizes PIKKs. Here, we describe a mechanism by which TTT promotes their de novo maturation in fission yeast. We show that TTT recognizes newly synthesized PIKKs during translation. Although PIKKs form multimeric complexes, we find that they do not engage in cotranslational assembly with their partners. Rather, our findings suggest a model by which TTT protects nascent PIKK polypeptides from misfolding and degradation because PIKKs acquire their native state after translation is terminated. Thus, PIKK maturation and assembly are temporally segregated, suggesting that the biogenesis of large complexes requires both dedicated chaperones and cotranslational interactions between subunits.
Collapse
Affiliation(s)
- Damien Toullec
- CRBM, University of Montpellier, CNRS, Montpellier, France
| | | | - Céline Faux
- CRBM, University of Montpellier, CNRS, Montpellier, France
| | - Ambre Noly
- CRBM, University of Montpellier, CNRS, Montpellier, France
| | | | - Martial Séveno
- BioCampus Montpellier, University of Montpellier, CNRS, INSERM, Montpellier, France
| | | |
Collapse
|
4
|
González-Calvo I, Iyer K, Carquin M, Khayachi A, Giuliani FA, Sigoillot SM, Vincent J, Séveno M, Veleanu M, Tahraoui S, Albert M, Vigy O, Bosso-Lefèvre C, Nadjar Y, Dumoulin A, Triller A, Bessereau JL, Rondi-Reig L, Isope P, Selimi F. Sushi domain-containing protein 4 controls synaptic plasticity and motor learning. eLife 2021; 10:65712. [PMID: 33661101 PMCID: PMC7972451 DOI: 10.7554/elife.65712] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [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: 12/13/2020] [Accepted: 03/03/2021] [Indexed: 01/28/2023] Open
Abstract
Fine control of protein stoichiometry at synapses underlies brain function and plasticity. How proteostasis is controlled independently for each type of synaptic protein in a synapse-specific and activity-dependent manner remains unclear. Here, we show that Susd4, a gene coding for a complement-related transmembrane protein, is expressed by many neuronal populations starting at the time of synapse formation. Constitutive loss-of-function of Susd4 in the mouse impairs motor coordination adaptation and learning, prevents long-term depression at cerebellar synapses, and leads to misregulation of activity-dependent AMPA receptor subunit GluA2 degradation. We identified several proteins with known roles in the regulation of AMPA receptor turnover, in particular ubiquitin ligases of the NEDD4 subfamily, as SUSD4 binding partners. Our findings shed light on the potential role of SUSD4 mutations in neurodevelopmental diseases.
Collapse
Affiliation(s)
- Inés González-Calvo
- Center for Interdisciplinary Research in Biology (CIRB), Collège de France, CNRS, INSERM, PSL Research University, Paris, France.,Institut des Neurosciences Cellulaires et Intégratives (INCI), CNRS, Université de Strasbourg, Strasbourg, France
| | - Keerthana Iyer
- Center for Interdisciplinary Research in Biology (CIRB), Collège de France, CNRS, INSERM, PSL Research University, Paris, France
| | - Mélanie Carquin
- Center for Interdisciplinary Research in Biology (CIRB), Collège de France, CNRS, INSERM, PSL Research University, Paris, France
| | - Anouar Khayachi
- Center for Interdisciplinary Research in Biology (CIRB), Collège de France, CNRS, INSERM, PSL Research University, Paris, France
| | - Fernando A Giuliani
- Institut des Neurosciences Cellulaires et Intégratives (INCI), CNRS, Université de Strasbourg, Strasbourg, France
| | - Séverine M Sigoillot
- Center for Interdisciplinary Research in Biology (CIRB), Collège de France, CNRS, INSERM, PSL Research University, Paris, France
| | - Jean Vincent
- Institut Biology Paris Seine (IBPS), Neuroscience Paris Seine (NPS), CeZaMe, CNRS, Sorbonne University, INSERM, Paris, France
| | - Martial Séveno
- BioCampus Montpellier, CNRS, INSERM, Université de Montpellier, Montpellier, France
| | - Maxime Veleanu
- Center for Interdisciplinary Research in Biology (CIRB), Collège de France, CNRS, INSERM, PSL Research University, Paris, France
| | - Sylvana Tahraoui
- Center for Interdisciplinary Research in Biology (CIRB), Collège de France, CNRS, INSERM, PSL Research University, Paris, France
| | - Mélanie Albert
- Center for Interdisciplinary Research in Biology (CIRB), Collège de France, CNRS, INSERM, PSL Research University, Paris, France
| | - Oana Vigy
- Institut de Génomique Fonctionnelle, CNRS, INSERM, Université de Montpellier, Montpellier, France
| | - Célia Bosso-Lefèvre
- Center for Interdisciplinary Research in Biology (CIRB), Collège de France, CNRS, INSERM, PSL Research University, Paris, France
| | - Yann Nadjar
- École Normale Supérieure, Institut de Biologie de l'ENS, INSERM, CNRS, PSL Research University, Paris, France
| | - Andréa Dumoulin
- École Normale Supérieure, Institut de Biologie de l'ENS, INSERM, CNRS, PSL Research University, Paris, France
| | - Antoine Triller
- École Normale Supérieure, Institut de Biologie de l'ENS, INSERM, CNRS, PSL Research University, Paris, France
| | - Jean-Louis Bessereau
- Université de Lyon, Université Claude Bernard Lyon 1, CNRS UMR 5310, INSERM U 1217, Institut Neuromyogène, Lyon, France
| | - Laure Rondi-Reig
- Institut Biology Paris Seine (IBPS), Neuroscience Paris Seine (NPS), CeZaMe, CNRS, Sorbonne University, INSERM, Paris, France
| | - Philippe Isope
- Institut des Neurosciences Cellulaires et Intégratives (INCI), CNRS, Université de Strasbourg, Strasbourg, France
| | - Fekrije Selimi
- Center for Interdisciplinary Research in Biology (CIRB), Collège de France, CNRS, INSERM, PSL Research University, Paris, France
| |
Collapse
|
5
|
Fumagalli A, Heuninck J, Pizzoccaro A, Moutin E, Koenen J, Séveno M, Durroux T, Junier MP, Schlecht-Louf G, Bachelerie F, Schütz D, Stumm R, Smit MJ, Guérineau NC, Chaumont-Dubel S, Marin P. The atypical chemokine receptor 3 interacts with Connexin 43 inhibiting astrocytic gap junctional intercellular communication. Nat Commun 2020; 11:4855. [PMID: 32978390 PMCID: PMC7519114 DOI: 10.1038/s41467-020-18634-y] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [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: 05/31/2019] [Accepted: 09/02/2020] [Indexed: 12/12/2022] Open
Abstract
The atypical chemokine receptor 3 (ACKR3) plays a pivotal role in directing the migration of various cellular populations and its over-expression in tumors promotes cell proliferation and invasiveness. The intracellular signaling pathways transducing ACKR3-dependent effects remain poorly characterized, an issue we addressed by identifying the interactome of ACKR3. Here, we report that recombinant ACKR3 expressed in HEK293T cells recruits the gap junction protein Connexin 43 (Cx43). Cx43 and ACKR3 are co-expressed in mouse brain astrocytes and human glioblastoma cells and form a complex in embryonic mouse brain. Functional in vitro studies show enhanced ACKR3 interaction with Cx43 upon ACKR3 agonist stimulation. Furthermore, ACKR3 activation promotes β-arrestin2- and dynamin-dependent Cx43 internalization to inhibit gap junctional intercellular communication in primary astrocytes. These results demonstrate a functional link between ACKR3 and gap junctions that might be of pathophysiological relevance. The atypical chemokine receptor 3 (ACKR3) is known to regulate cell migration, but the underlying mechanisms are unclear. Here, the authors show, from an interactome analysis, ACKR3 association with the gap junction protein Connexin 43 in vivo and ACKR3-mediated inhibition of astrocyte gap junctional communication.
Collapse
Affiliation(s)
- Amos Fumagalli
- Institut de Génomique Fonctionnelle, Université de Montpellier, CNRS, INSERM, Montpellier, France
| | - Joyce Heuninck
- Institut de Génomique Fonctionnelle, Université de Montpellier, CNRS, INSERM, Montpellier, France
| | - Anne Pizzoccaro
- Institut de Génomique Fonctionnelle, Université de Montpellier, CNRS, INSERM, Montpellier, France
| | - Enora Moutin
- Institut de Génomique Fonctionnelle, Université de Montpellier, CNRS, INSERM, Montpellier, France
| | - Joyce Koenen
- Université Paris-Saclay, Inserm, Inflammation, Microbiome and Immunosurveillance, 92140, Clamart, France.,Amsterdam Institute for Molecules Medicines and Systems, Division of Medicinal Chemistry, Faculty of Sciences, VU University Amsterdam, 1081, HV, Amsterdam, The Netherlands
| | - Martial Séveno
- Biocampus Montpellier, Université de Montpellier, CNRS, INSERM, Montpellier, France
| | - Thierry Durroux
- Institut de Génomique Fonctionnelle, Université de Montpellier, CNRS, INSERM, Montpellier, France
| | - Marie-Pierre Junier
- CNRS UMR8246, Inserm U1130, Neuroscience Paris Seine-IBPS, Sorbonne Universités, Paris, France
| | - Géraldine Schlecht-Louf
- Université Paris-Saclay, Inserm, Inflammation, Microbiome and Immunosurveillance, 92140, Clamart, France
| | - Francoise Bachelerie
- Université Paris-Saclay, Inserm, Inflammation, Microbiome and Immunosurveillance, 92140, Clamart, France
| | - Dagmar Schütz
- Institute of Pharmacology and Toxicology, Jena University Hospital, 07747, Jena, Germany
| | - Ralf Stumm
- Institute of Pharmacology and Toxicology, Jena University Hospital, 07747, Jena, Germany
| | - Martine J Smit
- Amsterdam Institute for Molecules Medicines and Systems, Division of Medicinal Chemistry, Faculty of Sciences, VU University Amsterdam, 1081, HV, Amsterdam, The Netherlands
| | - Nathalie C Guérineau
- Institut de Génomique Fonctionnelle, Université de Montpellier, CNRS, INSERM, Montpellier, France
| | - Séverine Chaumont-Dubel
- Institut de Génomique Fonctionnelle, Université de Montpellier, CNRS, INSERM, Montpellier, France
| | - Philippe Marin
- Institut de Génomique Fonctionnelle, Université de Montpellier, CNRS, INSERM, Montpellier, France.
| |
Collapse
|
6
|
Pujol CN, Dupuy V, Séveno M, Runtz L, Bockaert J, Marin P, Chaumont-Dubel S. Dynamic interactions of the 5-HT 6 receptor with protein partners control dendritic tree morphogenesis. Sci Signal 2020; 13:13/618/eaax9520. [PMID: 32047117 DOI: 10.1126/scisignal.aax9520] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The serotonin (5-hydroxytrypatmine) receptor 5-HT6 (5-HT6R) has emerged as a promising target to alleviate the cognitive symptoms of neurodevelopmental diseases. We previously demonstrated that 5-HT6R finely controls key neurodevelopmental steps, including neuronal migration and the initiation of neurite growth, through its interaction with cyclin-dependent kinase 5 (Cdk5). Here, we showed that 5-HT6R recruited G protein-regulated inducer of neurite outgrowth 1 (GPRIN1) through a Gs-dependent mechanism. Interactions between the receptor and either Cdk5 or GPRIN1 occurred sequentially during neuronal differentiation. The 5-HT6R-GPRIN1 interaction enhanced agonist-independent, receptor-stimulated cAMP production without altering the agonist-dependent response in NG108-15 neuroblastoma cells. This interaction also promoted neurite extension and branching in NG108-15 cells and primary mouse striatal neurons through a cAMP-dependent protein kinase A (PKA)-dependent mechanism. This study highlights the complex allosteric modulation of GPCRs by protein partners and demonstrates how dynamic interactions between GPCRs and their protein partners can control the different steps of highly coordinated cellular processes, such as dendritic tree morphogenesis.
Collapse
Affiliation(s)
- Camille N Pujol
- Institut de Génomique Fonctionnelle, Université de Montpellier, CNRS, INSERM, Montpellier, France
| | - Vincent Dupuy
- Institut de Génomique Fonctionnelle, Université de Montpellier, CNRS, INSERM, Montpellier, France
| | - Martial Séveno
- BioCampus Montpellier, Université de Montpellier, CNRS, INSERM, Montpellier, France
| | - Leonie Runtz
- Institut de Génomique Fonctionnelle, Université de Montpellier, CNRS, INSERM, Montpellier, France.,Department of Psychiatry, McGill University, Douglas Hospital Research Center, Montreal, Canada
| | - Joël Bockaert
- Institut de Génomique Fonctionnelle, Université de Montpellier, CNRS, INSERM, Montpellier, France
| | - Philippe Marin
- Institut de Génomique Fonctionnelle, Université de Montpellier, CNRS, INSERM, Montpellier, France.
| | - Séverine Chaumont-Dubel
- Institut de Génomique Fonctionnelle, Université de Montpellier, CNRS, INSERM, Montpellier, France.
| |
Collapse
|
7
|
Ruggiero A, Katou Y, Shirahige K, Séveno M, Piatti S. The Phosphatase PP1 Promotes Mitotic Slippage through Mad3 Dephosphorylation. Curr Biol 2020; 30:335-343.e5. [PMID: 31928870 DOI: 10.1016/j.cub.2019.11.054] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2019] [Revised: 10/04/2019] [Accepted: 11/18/2019] [Indexed: 11/17/2022]
Abstract
Accurate chromosome segregation requires bipolar attachment of kinetochores to spindle microtubules. A conserved surveillance mechanism, the spindle assembly checkpoint (SAC), responds to lack of kinetochore-microtubule connections and delays anaphase onset until all chromosomes are bipolarly attached [1]. SAC signaling fires at kinetochores and involves a soluble mitotic checkpoint complex (MCC) that inhibits the anaphase-promoting complex (APC) [2, 3]. The mitotic delay imposed by SAC, however, is not everlasting. If kinetochores fail to establish bipolar connections, cells can escape from the SAC-induced mitotic arrest through a process called mitotic slippage [4]. Mitotic slippage occurs in the presence of SAC signaling at kinetochores [5, 6], but whether and how MCC stability and APC inhibition are actively controlled during slippage is unknown. The PP1 phosphatase has emerged as a key factor in SAC silencing once all kinetochores are bipolarly attached [7, 8]. PP1 turns off SAC signaling through dephosphorylation of the SAC scaffold Knl1/Blinkin at kinetochores [9-11]. Here, we show that, in budding yeast, PP1 is also required for mitotic slippage. However, its involvement in this process is not linked to kinetochores but rather to MCC stability. We identify S268 of Mad3 as a critical target of PP1 in this process. Mad3 S268 dephosphorylation destabilizes the MCC without affecting the initial SAC-induced mitotic arrest. Conversely, it accelerates mitotic slippage and overcomes the slippage defect of PP1 mutants. Thus, slippage is not the mere consequence of incomplete APC inactivation that brings about mitotic exit, as originally proposed, but involves the exertive antagonism between kinases and phosphatases.
Collapse
Affiliation(s)
- Antonella Ruggiero
- CRBM, University of Montpellier, CNRS, 1919 Route de Mende, 34293 Montpellier, France
| | - Yuki Katou
- Research Center for Epigenetic Disease, University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, 113-0032 Tokyo, Japan
| | - Katsuhiko Shirahige
- Research Center for Epigenetic Disease, University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, 113-0032 Tokyo, Japan
| | - Martial Séveno
- BioCampus Montpellier, CNRS, INSERM, University of Montpellier, 34000 Montpellier, France
| | - Simonetta Piatti
- CRBM, University of Montpellier, CNRS, 1919 Route de Mende, 34293 Montpellier, France.
| |
Collapse
|
8
|
Elías-Villalobos A, Toullec D, Faux C, Séveno M, Helmlinger D. Chaperone-mediated ordered assembly of the SAGA and NuA4 transcription co-activator complexes in yeast. Nat Commun 2019; 10:5237. [PMID: 31748520 PMCID: PMC6868236 DOI: 10.1038/s41467-019-13243-w] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [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: 03/08/2019] [Accepted: 10/25/2019] [Indexed: 12/19/2022] Open
Abstract
Transcription initiation involves the coordinated activities of large multimeric complexes, but little is known about their biogenesis. Here we report several principles underlying the assembly and topological organization of the highly conserved SAGA and NuA4 co-activator complexes, which share the Tra1 subunit. We show that Tra1 contributes to the overall integrity of NuA4, whereas, within SAGA, it specifically controls the incorporation of the de-ubiquitination module (DUB), as part of an ordered assembly pathway. Biochemical and functional analyses reveal the mechanism by which Tra1 specifically interacts with either SAGA or NuA4. Finally, we demonstrate that Hsp90 and its cochaperone TTT promote Tra1 de novo incorporation into both complexes, indicating that Tra1, the sole pseudokinase of the PIKK family, shares a dedicated chaperone machinery with its cognate kinases. Overall, our work brings mechanistic insights into the assembly of transcriptional complexes and reveals the contribution of dedicated chaperones to this process. Transcription initiation involves the coordinated assembly and activity of large multimeric complexes. Here the authors report on the chaperone-mediated ordered assembly of the SAGA and NuA4 transcription co-activator complexes in fission yeast, providing insight into the de novo assembly of transcriptional complexes and the contribution of dedicated chaperones to this process.
Collapse
Affiliation(s)
| | - Damien Toullec
- CRBM, CNRS, University of Montpellier, Montpellier, France
| | - Céline Faux
- CRBM, CNRS, University of Montpellier, Montpellier, France
| | - Martial Séveno
- BioCampus Montpellier, CNRS, INSERM, University of Montpellier, Montpellier, France
| | | |
Collapse
|
9
|
Castro-Severyn J, Pardo-Esté C, Sulbaran Y, Cabezas C, Gariazzo V, Briones A, Morales N, Séveno M, Decourcelle M, Salvetat N, Remonsellez F, Castro-Nallar E, Molina F, Molina L, Saavedra CP. Arsenic Response of Three Altiplanic Exiguobacterium Strains With Different Tolerance Levels Against the Metalloid Species: A Proteomics Study. Front Microbiol 2019; 10:2161. [PMID: 31611848 PMCID: PMC6775490 DOI: 10.3389/fmicb.2019.02161] [Citation(s) in RCA: 9] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2019] [Accepted: 09/03/2019] [Indexed: 12/23/2022] Open
Abstract
Exiguobacterium is a polyextremophile bacterial genus with a physiology that allows it to develop in different adverse environments. The Salar de Huasco is one of these environments due to its altitude, atmospheric pressure, solar radiation, temperature variations, pH, salinity, and the presence of toxic compounds such as arsenic. However, the physiological and/or molecular mechanisms that enable them to prosper in these environments have not yet been described. Our research group has isolated several strains of Exiguobacterium genus from different sites of Salar de Huasco, which show different resistance levels to As(III) and As(V). In this work, we compare the protein expression patterns of the three strains in response to arsenic by a proteomic approach; strains were grown in absence of the metalloid and in presence of As(III) and As(V) sublethal concentrations and the protein separation was carried out in 2D electrophoresis gels (2D-GE). In total, 999 spots were detected, between 77 and 173 of which showed significant changes for As(III) among the three strains, and between 90 and 143 for As(V), respectively, compared to the corresponding control condition. Twenty-seven of those were identified by mass spectrometry (MS). Among these identified proteins, the ArsA [ATPase from the As(III) efflux pump] was found to be up-regulated in response to both arsenic conditions in the three strains, as well as the Co-enzyme A disulfide reductase (Cdr) in the two more resistant strains. Interestingly, in this genus the gene that codifies for Cdr is found within the genic context of the ars operon. We suggest that this protein could be restoring antioxidants molecules, necessary for the As(V) reduction. Additionally, among the proteins that change their expression against As, we found several with functions relevant to stress response, e.g., Hpf, LuxS, GLpX, GlnE, and Fur. This study allowed us to shed light into the physiology necessary for these bacteria to be able to tolerate the toxicity and stress generated by the presence of arsenic in their niche.
Collapse
Affiliation(s)
- Juan Castro-Severyn
- Laboratorio de Microbiología Molecular, Departamento de Ciencias Biológicas, Facultad de Ciencias de la Vida, Universidad Andrés Bello, Santiago, Chile.,Center for Bioinformatics and Integrative Biology, Facultad de Ciencias de la Vida, Universidad Andrés Bello, Santiago, Chile
| | - Coral Pardo-Esté
- Laboratorio de Microbiología Molecular, Departamento de Ciencias Biológicas, Facultad de Ciencias de la Vida, Universidad Andrés Bello, Santiago, Chile
| | - Yoelvis Sulbaran
- Laboratorio de Microbiología Molecular, Departamento de Ciencias Biológicas, Facultad de Ciencias de la Vida, Universidad Andrés Bello, Santiago, Chile
| | - Carolina Cabezas
- Laboratorio de Microbiología Molecular, Departamento de Ciencias Biológicas, Facultad de Ciencias de la Vida, Universidad Andrés Bello, Santiago, Chile
| | - Valentina Gariazzo
- Laboratorio de Microbiología Molecular, Departamento de Ciencias Biológicas, Facultad de Ciencias de la Vida, Universidad Andrés Bello, Santiago, Chile
| | - Alan Briones
- Laboratorio de Microbiología Molecular, Departamento de Ciencias Biológicas, Facultad de Ciencias de la Vida, Universidad Andrés Bello, Santiago, Chile
| | - Naiyulin Morales
- Laboratorio de Microbiología Molecular, Departamento de Ciencias Biológicas, Facultad de Ciencias de la Vida, Universidad Andrés Bello, Santiago, Chile
| | - Martial Séveno
- BioCampus Montpellier, CNRS, INSERM, Université de Montpellier, Montpellier, France
| | - Mathilde Decourcelle
- BioCampus Montpellier, CNRS, INSERM, Université de Montpellier, Montpellier, France
| | | | - Francisco Remonsellez
- Laboratorio de Microbiología Aplicada y Extremófilos, Departamento de Ingeniería Química, Facultad de Ingeniería y Ciencias Geológicas, Universidad Católica del Norte, Antofagasta, Chile.,Centro de Investigación Tecnológica del Agua en el Desierto (CEITSAZA), Universidad Católica del Norte, Antofagasta, Chile
| | - Eduardo Castro-Nallar
- Center for Bioinformatics and Integrative Biology, Facultad de Ciencias de la Vida, Universidad Andrés Bello, Santiago, Chile
| | - Franck Molina
- Sys2Diag, UMR9005 CNRS ALCEDIAG, Montpellier, France
| | | | - Claudia P Saavedra
- Laboratorio de Microbiología Molecular, Departamento de Ciencias Biológicas, Facultad de Ciencias de la Vida, Universidad Andrés Bello, Santiago, Chile
| |
Collapse
|
10
|
Molinari N, Roche S, Peoc'h K, Tiers L, Séveno M, Hirtz C, Lehmann S. Sample Pooling and Inflammation Linked to the False Selection of Biomarkers for Neurodegenerative Diseases in Top-Down Proteomics: A Pilot Study. Front Mol Neurosci 2018; 11:477. [PMID: 30618622 PMCID: PMC6305369 DOI: 10.3389/fnmol.2018.00477] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [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: 07/29/2018] [Accepted: 12/05/2018] [Indexed: 01/03/2023] Open
Abstract
Proteomic technologies have been recently adapted to the new field of clinical proteomics. The origin of errors and biases has been well-identified in the pre-analytical steps, leading to the measurement of clinical analytes. One possible source of inadequacy in clinical proteomics is linked to sample pooling. This practice is usually related to low sample availability, variability, experiment time/cost. In this study, we first asked whether sample pooling in top–down proteomics is suitable to obtain a relevant biological average. Our second objective was to identify inflammatory biomarkers of outlier samples in our population of Creutzfeldt-Jakob disease patients. Our results demonstrated that, in a proteomics study, sample pooling as well as the inflammation status was an important source of errors: missed detection of biomarkers and false identification of others. Pooled samples were not equivalent to the average of biological values. In addition, this procedure reduced the statistical value of the identified biomarkers due to a stabilization of their standard deviation and rendered outlier samples difficult to detect. We identified serum amyloid A as a candidate biomarker of outlier samples. The presence of this protein, which could be explained by inflammatory processes, induced major modifications in the sample profiles.
Collapse
Affiliation(s)
- Nicolas Molinari
- Department of Statistics, CHU de Montpellier, University of Montpellier, Montpellier, France
| | - Stéphane Roche
- INSERM, UMR 1251, Aix-Marseille Université, Marseille, France
| | - Katell Peoc'h
- APHP, HUPNVS, Hôpital Beaujon, UFR de Médecine Xavier Bichat, Clichy and Université Paris Diderot, Paris, France
| | - Laurent Tiers
- Laboratoire et Plateforme de Biochimie Protéomique Clinique, CHU de Montpellier, Montpellier, France
| | - Martial Séveno
- CNRS, INSERM, BioCampus Montpellier, University of Montpellier, Montpellier, France
| | - Christophe Hirtz
- Laboratoire et Plateforme de Biochimie Protéomique Clinique, CHU de Montpellier, Montpellier, France.,IRMB, INSERM U1183, University of Montpellier, Montpellier, France
| | - Sylvain Lehmann
- Laboratoire et Plateforme de Biochimie Protéomique Clinique, CHU de Montpellier, Montpellier, France.,IRMB, INSERM U1183, University of Montpellier, Montpellier, France
| |
Collapse
|
11
|
Bossard G, Grébaut P, Thévenon S, Séveno M, Berthier D, Holzmuller P. Cloning, expression, molecular characterization and preliminary studies on immunomodulating properties of recombinant Trypanosoma congolense calreticulin. Infect Genet Evol 2016; 45:320-331. [PMID: 27688033 DOI: 10.1016/j.meegid.2016.09.020] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2016] [Revised: 09/21/2016] [Accepted: 09/22/2016] [Indexed: 10/20/2022]
Abstract
Trypanosomes are bloodstream protozoan parasites, which are pathogens of veterinary and medical importance. Several mammalian species, including humans, can be infected by different species of the genus Trypanosoma (T. congolense, T. evansi, T. brucei, T. vivax) exhibiting more or less virulent and pathogenic phenotypes. A previous screening of the excreted-secreted proteins of T. congolense demonstrated an overexpression of several proteins correlated with the virulence and pathogenicity of the strain. Of these proteins, calreticulin (CRT) has shown differential expression between two T. congolense strains with opposite infectious behavior and has been selected as a target molecule based on its immune potential functions in parasitic diseases. In this study, we set out to determine the role of T. congolense calreticulin as an immune target. Immunization of mice with recombinant T. congolense calreticulin induced antibody production, which was associated with delayed parasitemia and increased survival of the challenged animal. These results strongly suggest that some excreted-secreted proteins of T. congolense are a worthwhile target candidate to interfere with the infectious process.
Collapse
Affiliation(s)
- Geraldine Bossard
- CIRAD, UMR INTERTRYP (Interactions hôtes-vecteurs-parasites-environnement dans les maladies tropicales négligées dues aux trypanosomatidés), campus international de Baillarguet, TA/A-17/G, F-34398 Montpellier, France.
| | | | - Sophie Thévenon
- CIRAD, UMR INTERTRYP (Interactions hôtes-vecteurs-parasites-environnement dans les maladies tropicales négligées dues aux trypanosomatidés), campus international de Baillarguet, TA/A-17/G, F-34398 Montpellier, France.
| | - Martial Séveno
- plateforme de protéomique fonctionnelle, UMS biocampus Montpellier, institut de génomique fonctionnelle, 141 rue de la Cardonille, F-34094 Montpellier, France.
| | - David Berthier
- CIRAD, UMR INTERTRYP (Interactions hôtes-vecteurs-parasites-environnement dans les maladies tropicales négligées dues aux trypanosomatidés), campus international de Baillarguet, TA/A-17/G, F-34398 Montpellier, France.
| | - Philippe Holzmuller
- CIRAD, UMR CMAEE (control des maladies animales exotiques et émergentes), campus international de Baillarguet, TA/A-15/G, F-34398 Montpellier, France.
| |
Collapse
|
12
|
Plutoni C, Bazellieres E, Le Borgne-Rochet M, Comunale F, Brugues A, Séveno M, Planchon D, Thuault S, Morin N, Bodin S, Trepat X, Gauthier-Rouvière C. P-cadherin promotes collective cell migration via a Cdc42-mediated increase in mechanical forces. J Cell Biol 2016; 212:199-217. [PMID: 26783302 PMCID: PMC4738379 DOI: 10.1083/jcb.201505105] [Citation(s) in RCA: 76] [Impact Index Per Article: 9.5] [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] [Indexed: 01/09/2023] Open
Abstract
P-cadherin induces polarization and collective cell migration through an increase in the strength and anisotropy of mechanical forces, which is mediated by the P-cadherin/β-PIX/Cdc42 axis. Collective cell migration (CCM) is essential for organism development, wound healing, and metastatic transition, the primary cause of cancer-related death, and it involves cell–cell adhesion molecules of the cadherin family. Increased P-cadherin expression levels are correlated with tumor aggressiveness in carcinoma and aggressive sarcoma; however, how P-cadherin promotes tumor malignancy remains unknown. Here, using integrated cell biology and biophysical approaches, we determined that P-cadherin specifically induces polarization and CCM through an increase in the strength and anisotropy of mechanical forces. We show that this mechanical regulation is mediated by the P-cadherin/β-PIX/Cdc42 axis; P-cadherin specifically activates Cdc42 through β-PIX, which is specifically recruited at cell–cell contacts upon CCM. This mechanism of cell polarization and migration is absent in cells expressing E- or R-cadherin. Thus, we identify a specific role of P-cadherin through β-PIX–mediated Cdc42 activation in the regulation of cell polarity and force anisotropy that drives CCM.
Collapse
Affiliation(s)
- Cédric Plutoni
- Centre de Recherche de Biochimie Macromoléculaire, Centre National de la Recherche Scientifique, Unité Mixte de Recherche 5237, Universités Montpellier, 34293 Montpellier, France
| | - Elsa Bazellieres
- Institute for Bioengineering of Catalonia, Universitat de Barcelona, 08007 Barcelona, Spain
| | - Maïlys Le Borgne-Rochet
- Centre de Recherche de Biochimie Macromoléculaire, Centre National de la Recherche Scientifique, Unité Mixte de Recherche 5237, Universités Montpellier, 34293 Montpellier, France
| | - Franck Comunale
- Centre de Recherche de Biochimie Macromoléculaire, Centre National de la Recherche Scientifique, Unité Mixte de Recherche 5237, Universités Montpellier, 34293 Montpellier, France
| | - Agusti Brugues
- Institute for Bioengineering of Catalonia, Universitat de Barcelona, 08007 Barcelona, Spain
| | - Martial Séveno
- Functional Proteomics Platform, Institut de Génomique Fonctionnelle, Centre National de la Recherche Scientifique, Unité Mixte de Recherche 5203, Institut National de la Santé et de la Recherche Médicale U1191, Universités Montpellier, 34094 Montpellier, France
| | - Damien Planchon
- Centre de Recherche de Biochimie Macromoléculaire, Centre National de la Recherche Scientifique, Unité Mixte de Recherche 5237, Universités Montpellier, 34293 Montpellier, France
| | - Sylvie Thuault
- Centre de Recherche de Biochimie Macromoléculaire, Centre National de la Recherche Scientifique, Unité Mixte de Recherche 5237, Universités Montpellier, 34293 Montpellier, France
| | - Nathalie Morin
- Centre de Recherche de Biochimie Macromoléculaire, Centre National de la Recherche Scientifique, Unité Mixte de Recherche 5237, Universités Montpellier, 34293 Montpellier, France
| | - Stéphane Bodin
- Centre de Recherche de Biochimie Macromoléculaire, Centre National de la Recherche Scientifique, Unité Mixte de Recherche 5237, Universités Montpellier, 34293 Montpellier, France
| | - Xavier Trepat
- Institute for Bioengineering of Catalonia, Universitat de Barcelona, 08007 Barcelona, Spain Centro de Investigación Biomédica en Red en Bioingeniería, Biomateriales y Nanomedicina, 08010 Barcelona, Spain
| | - Cécile Gauthier-Rouvière
- Centre de Recherche de Biochimie Macromoléculaire, Centre National de la Recherche Scientifique, Unité Mixte de Recherche 5237, Universités Montpellier, 34293 Montpellier, France
| |
Collapse
|
13
|
Merlini L, Bolognesi A, Juanes MA, Vandermoere F, Courtellemont T, Pascolutti R, Séveno M, Barral Y, Piatti S. Rho1- and Pkc1-dependent phosphorylation of the F-BAR protein Syp1 contributes to septin ring assembly. Mol Biol Cell 2015; 26:3245-62. [PMID: 26179915 PMCID: PMC4569315 DOI: 10.1091/mbc.e15-06-0366] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [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: 06/12/2015] [Accepted: 07/10/2015] [Indexed: 12/20/2022] Open
Abstract
Septins often form filaments and rings at the neck of cellular appendages. Assembly of these structures must be coordinated with membrane remodeling. In budding yeast, the Rho1 GTPase and its effector, Pkc1, play a role in septin ring stabilization during budding at least partly through phosphorylation of the bud neck–associated F-BAR protein Syp1. In many cell types, septins assemble into filaments and rings at the neck of cellular appendages and/or at the cleavage furrow to help compartmentalize the plasma membrane and support cytokinesis. How septin ring assembly is coordinated with membrane remodeling and controlled by mechanical stress at these sites is unclear. Through a genetic screen, we uncovered an unanticipated link between the conserved Rho1 GTPase and its effector protein kinase C (Pkc1) with septin ring stability in yeast. Both Rho1 and Pkc1 stabilize the septin ring, at least partly through phosphorylation of the membrane-associated F-BAR protein Syp1, which colocalizes asymmetrically with the septin ring at the bud neck. Syp1 is displaced from the bud neck upon Pkc1-dependent phosphorylation at two serines, thereby affecting the rigidity of the new-forming septin ring. We propose that Rho1 and Pkc1 coordinate septin ring assembly with membrane and cell wall remodeling partly by controlling Syp1 residence at the bud neck.
Collapse
Affiliation(s)
- Laura Merlini
- Centre de Recherche en Biochimie Macromoléculaire, 34293 Montpellier, France
| | | | | | - Franck Vandermoere
- Functional Proteomic Platform, Institut de Génomique Fonctionnelle, 34094 Montpellier, France
| | | | - Roberta Pascolutti
- Centre de Recherche en Biochimie Macromoléculaire, 34293 Montpellier, France
| | - Martial Séveno
- Functional Proteomic Platform, Institut de Génomique Fonctionnelle, 34094 Montpellier, France
| | - Yves Barral
- Institute of Biochemistry, ETH Zurich, 8093 Zurich, Switzerland
| | - Simonetta Piatti
- Centre de Recherche en Biochimie Macromoléculaire, 34293 Montpellier, France
| |
Collapse
|
14
|
Campos N, Myburgh R, Garcel A, Vautrin A, Lapasset L, Nadal ES, Mahuteau-Betzer F, Najman R, Fornarelli P, Tantale K, Basyuk E, Séveno M, Venables JP, Pau B, Bertrand E, Wainberg MA, Speck RF, Scherrer D, Tazi J. Long lasting control of viral rebound with a new drug ABX464 targeting Rev - mediated viral RNA biogenesis. Retrovirology 2015; 12:30. [PMID: 25889234 PMCID: PMC4422473 DOI: 10.1186/s12977-015-0159-3] [Citation(s) in RCA: 68] [Impact Index Per Article: 7.6] [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: 01/16/2015] [Accepted: 03/24/2015] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND Current therapies have succeeded in controlling AIDS pandemic. However, there is a continuing need for new drugs, in particular those acting through new and as yet unexplored mechanisms of action to achieve HIV infection cure. We took advantage of the unique feature of proviral genome to require both activation and inhibition of splicing of viral transcripts to develop molecules capable of achieving long lasting effect on viral replication in humanized mouse models through inhibition of Rev-mediated viral RNA biogenesis. RESULTS Current HIV therapies reduce viral load during treatment but titers rebound after treatment is discontinued. We devised a new drug that has a long lasting effect after viral load reduction. We demonstrate here that ABX464 compromises HIV replication of clinical isolates of different subtypes without selecting for drug resistance in PBMCs or macrophages. ABX464 alone, also efficiently compromised viral proliferation in two humanized mouse models infected with HIV that require a combination of 3TC, Raltegravir and Tenofovir (HAART) to achieve viral inhibition in current protocols. Crucially, while viral load increased dramatically just one week after stopping HAART treatment, only slight rebound was observed following treatment cessation with ABX464 and the magnitude of the rebound was maintained below to that of HAART for two months after stopping the treatment. Using a system to visualize single HIV RNA molecules in living cells, we show that ABX464 inhibits viral replication by preventing Rev-mediated export of unspliced HIV-1 transcripts to the cytoplasm and by interacting with the Cap Binding Complex (CBC). Deep sequencing of viral RNA from treated cells established that retained viral RNA is massively spliced but importantly, normal cellular splicing is unaffected by the drug. Consistently ABX464 is non-toxic in humans and therefore represents a promising complement to current HIV therapies. CONCLUSIONS ABX464 represents a novel class of anti-HIV molecules with unique properties. ABX464 has a long lasting effect in humanized mice and neutralizes the expression of HIV-1 proviral genome of infected immune cells including reservoirs and it is therefore a promising drug toward a functional cure of HIV.
Collapse
Affiliation(s)
- Noëlie Campos
- ABIVAX, 1919 route de Mende, 34293, Montpellier Cedex 5, France.
| | - Renier Myburgh
- Division of Infectious Diseases and Hospital Epidemiology Department of Internal Medicin, University of Zurich, University Hospital, Raemistrasse 100, 8091, Zurich, Switzerland.
| | - Aude Garcel
- ABIVAX, 1919 route de Mende, 34293, Montpellier Cedex 5, France.
| | - Audrey Vautrin
- Institut de Génétique Moléculaire de Montpellier, University of Montpellier, CNRS UMR 5535, 1919 route de Mende, 34293, Montpellier Cedex 5, France.
| | - Laure Lapasset
- Institut de Génétique Moléculaire de Montpellier, University of Montpellier, CNRS UMR 5535, 1919 route de Mende, 34293, Montpellier Cedex 5, France.
| | - Erika Schläpfer Nadal
- Division of Infectious Diseases and Hospital Epidemiology Department of Internal Medicin, University of Zurich, University Hospital, Raemistrasse 100, 8091, Zurich, Switzerland.
| | - Florence Mahuteau-Betzer
- Institut Curie, CNRS UMR9187, INSERM U1196, Centre universitaire, Bâtiment 110, 15 rue Georges Clémenceau, 91405, ORSAY CEDEX, France.
| | - Romain Najman
- ABIVAX, 1919 route de Mende, 34293, Montpellier Cedex 5, France.
| | | | - Katjana Tantale
- Institut de Génétique Moléculaire de Montpellier, University of Montpellier, CNRS UMR 5535, 1919 route de Mende, 34293, Montpellier Cedex 5, France.
| | - Eugénia Basyuk
- Institut de Génétique Moléculaire de Montpellier, University of Montpellier, CNRS UMR 5535, 1919 route de Mende, 34293, Montpellier Cedex 5, France.
| | - Martial Séveno
- Plate-forme de Protéomique Fonctionnelle (FPP) IGF, UMR 5203 CNRS - INSERM U661- UM, 141 rue de la Cardonille (pièce 029), 34094, Montpellier CEDEX 05, France.
| | - Julian P Venables
- Institut de Génétique Moléculaire de Montpellier, University of Montpellier, CNRS UMR 5535, 1919 route de Mende, 34293, Montpellier Cedex 5, France.
| | - Bernard Pau
- Université de Montpellier, UFR Pharmacie, 15 Avenue Charles Flahault, 34000, Montpellier, France.
| | - Edouard Bertrand
- Institut de Génétique Moléculaire de Montpellier, University of Montpellier, CNRS UMR 5535, 1919 route de Mende, 34293, Montpellier Cedex 5, France.
| | - Mark A Wainberg
- McGill AIDS Center, Lady Davis Institute - Jewish General Hospital, Montréal, QC, Canada.
| | - Roberto F Speck
- Division of Infectious Diseases and Hospital Epidemiology Department of Internal Medicin, University of Zurich, University Hospital, Raemistrasse 100, 8091, Zurich, Switzerland.
| | - Didier Scherrer
- ABIVAX, 1919 route de Mende, 34293, Montpellier Cedex 5, France.
| | - Jamal Tazi
- Institut de Génétique Moléculaire de Montpellier, University of Montpellier, CNRS UMR 5535, 1919 route de Mende, 34293, Montpellier Cedex 5, France.
| |
Collapse
|
15
|
Machin A, Telleria J, Brizard JP, Demettre E, Séveno M, Ayala FJ, Tibayrenc M. Trypanosoma cruzi: gene expression surveyed by proteomic analysis reveals interaction between different genotypes in mixed in vitro cultures. PLoS One 2014; 9:e95442. [PMID: 24748035 PMCID: PMC3991653 DOI: 10.1371/journal.pone.0095442] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2013] [Accepted: 03/26/2014] [Indexed: 11/30/2022] Open
Abstract
We have analyzed the comportment in in vitro culture of 2 different genotypes of Trypanosoma cruzi, the agent of Chagas disease, pertaining to 2 major genetic subdivisions (near-clades) of this parasite. One of the stocks was a fast-growing one, highly virulent in mice, while the other one was slow- growing, mildly virulent in mice. The working hypothesis was that mixtures of genotypes interact, a pattern that has been observed by us in empirical experimental studies. Genotype mixtures were followed every 7 days and characterized by the DIGE technology of proteomic analysis. Proteic spots of interest were characterized by the SAMESPOT software. Patterns were compared to those of pure genotypes that were also evaluated every 7 days. One hundred and three spots exhibited changes in time by comparison with T = 0. The major part of these spots (58%) exhibited an under-expression pattern by comparison with the pure genotypes. 32% of the spots wereover-expressed; 10% of spots were not different from those of pure genotypes. Interestingly, interaction started a few minutes after the mixtures were performed. We have retained 43 different proteins that clearly exhibited either under- or over-expression. Proteins showing interaction were characterized by mass spectrometry (MALDI-TOF). Close to 50% of them were either tubulins or heat shock proteins. This study confirms that mixed genotypes of T. cruzi interact at the molecular level. This is of great interest because mixtures of genotypes are very frequent in Chagas natural cycles, both in insect vectors and in mammalian hosts, and may play an important role in the transmission and severity of Chagas disease. The methodology proposed here is potentially applicable to any micropathogen, including fungi, bacteria and viruses. It should be of great interest in the case of bacteria, for which the epidemiological and clinical consequences of mixed infections could be underestimated.
Collapse
Affiliation(s)
- Alexandre Machin
- Unité Mixte de Recherche, Institut de Recherche pour le Développement/Centre National de la Recherche Scientifique/Universités Montpellier 1 and 2, Génétique et Evolution des Maladies Infectieuses, n° 5290, Maladies Infectieuses et Vecteurs Ecologie, Génétique, Evolution et Contrôle (MIVEGEC) Institut de Recherche pour le Développement, Montpellier, France
| | - Jenny Telleria
- Unité Mixte de Recherche, Institut de Recherche pour le Développement/Centre National de la Recherche Scientifique/Universités Montpellier 1 and 2, Génétique et Evolution des Maladies Infectieuses, n° 5290, Maladies Infectieuses et Vecteurs Ecologie, Génétique, Evolution et Contrôle (MIVEGEC) Institut de Recherche pour le Développement, Montpellier, France
| | - Jean-Paul Brizard
- Unité Mixte de Recherche, Institut de Recherche pour le Développement/Centre National de la Recherche Scientifique, n° 5096, Centre Institut de Recherche pour le Développement, Montpellier, France
| | - Edith Demettre
- Plate-forme de Proteomique Fonctionnelle, c/o Institut de Génomique Fonctionnelle, Centre National de la Recherche Scientifique Unité Mixte de Recherche 5203, Institut National de la Santé et de la Recherche Médicales, Unité 661, Université Montpellier I et II, Montpellier, France
| | - Martial Séveno
- Plate-forme de Proteomique Fonctionnelle, c/o Institut de Génomique Fonctionnelle, Centre National de la Recherche Scientifique Unité Mixte de Recherche 5203, Institut National de la Santé et de la Recherche Médicales, Unité 661, Université Montpellier I et II, Montpellier, France
| | - Francisco José Ayala
- Department of Ecology and Evolutionary Biology, University of California Irvine, Irvine, California, United States of America
| | - Michel Tibayrenc
- Unité Mixte de Recherche, Institut de Recherche pour le Développement/Centre National de la Recherche Scientifique/Universités Montpellier 1 and 2, Génétique et Evolution des Maladies Infectieuses, n° 5290, Maladies Infectieuses et Vecteurs Ecologie, Génétique, Evolution et Contrôle (MIVEGEC) Institut de Recherche pour le Développement, Montpellier, France
- * E-mail:
| |
Collapse
|
16
|
Meffre J, Chaumont-Dubel S, Mannoury la Cour C, Loiseau F, Watson DJG, Dekeyne A, Séveno M, Rivet JM, Gaven F, Déléris P, Hervé D, Fone KCF, Bockaert J, Millan MJ, Marin P. 5-HT(6) receptor recruitment of mTOR as a mechanism for perturbed cognition in schizophrenia. EMBO Mol Med 2013; 4:1043-56. [PMID: 23027611 PMCID: PMC3491835 DOI: 10.1002/emmm.201201410] [Citation(s) in RCA: 126] [Impact Index Per Article: 11.5] [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] [Indexed: 12/16/2022] Open
Abstract
Cognitive deficits in schizophrenia severely compromise quality of life and are poorly controlled by current antipsychotics. While 5-HT6 receptor blockade holds special promise, molecular substrates underlying their control of cognition remain unclear. Using a proteomic strategy, we show that 5-HT6 receptors physically interact with several proteins of the mammalian target of rapamycin (mTOR) pathway, including mTOR. Further, 5-HT6 receptor activation increased mTOR signalling in rodent prefrontal cortex (PFC). Linking this signalling event to cognitive impairment, the mTOR inhibitor rapamycin prevented deficits in social cognition and novel object discrimination induced by 5-HT6 agonists. In two developmental models of schizophrenia, specifically neonatal phencyclidine treatment and post-weaning isolation rearing, the activity of mTOR was enhanced in the PFC, and rapamycin, like 5-HT6 antagonists, reversed these cognitive deficits. These observations suggest that recruitment of mTOR by prefrontal 5-HT6 receptors contributes to the perturbed cognition in schizophrenia, offering new vistas for its therapeutic control.
Collapse
Affiliation(s)
- Julie Meffre
- CNRS, UMR-5203, Institut de Génomique Fonctionnelle, Montpellier, France
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
17
|
Thouvenot E, Urbach S, Vigy O, Séveno M, Galéotti N, Nguyen G, Bockaert J, Marin P. Quantitative proteomic analysis reveals protein expression changes in the murine neuronal secretome during apoptosis. J Proteomics 2012; 77:394-405. [DOI: 10.1016/j.jprot.2012.09.013] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2012] [Revised: 08/24/2012] [Accepted: 09/12/2012] [Indexed: 01/08/2023]
|
18
|
Wasinpiyamongkol L, Patramool S, Luplertlop N, Surasombatpattana P, Doucoure S, Mouchet F, Séveno M, Remoue F, Demettre E, Brizard JP, Jouin P, Biron DG, Thomas F, Missé D. Blood-feeding and immunogenic Aedes aegypti saliva proteins. Proteomics 2010; 10:1906-16. [PMID: 19882664 DOI: 10.1002/pmic.200900626] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Mosquito-transmitted pathogens pass through the insect's midgut (MG) and salivary gland (SG). What occurs in these organs in response to a blood meal is poorly understood, but identifying the physiological differences between sugar-fed and blood-fed (BF) mosquitoes could shed light on factors important in pathogens transmission. We compared differential protein expression in the MGs and SGs of female Aedes aegypti mosquitoes after a sugar- or blood-based diet. No difference was observed in the MG protein expression levels but certain SG proteins were highly expressed only in BF mosquitoes. In sugar-fed mosquitoes, housekeeping proteins were highly expressed (especially those related to energy metabolism) and actin was up-regulated. The immunofluorescence assay shows that there is no disruption of the SG cytoskeletal after the blood meal. We have generated for the first time the 2-DE profiles of immunogenic Ae. aegypti SG BF-related proteins. These new data could contribute to the understanding of the physiological processes that appear during the blood meal.
Collapse
Affiliation(s)
- Ladawan Wasinpiyamongkol
- Department of Tropical Hygiene, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
19
|
Séveno M, Séveno-Carpentier E, Voxeur A, Menu-Bouaouiche L, Rihouey C, Delmas F, Chevalier C, Driouich A, Lerouge P. Characterization of a putative 3-deoxy-D-manno-2-octulosonic acid (Kdo) transferase gene from Arabidopsis thaliana. Glycobiology 2010; 20:617-28. [PMID: 20124190 DOI: 10.1093/glycob/cwq011] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
The structures of the pectic polysaccharide rhamnogalacturonan II (RG-II) pectin constituent are remarkably evolutionary conserved in all plant species. At least 12 different glycosyl residues are present in RG-II. Among them is the seldom eight-carbon sugar 3-deoxy-d-manno-octulosonic acid (Kdo) whose biosynthetic pathway has been shown to be conserved between plants and Gram-negative bacteria. Kdo is formed in the cytosol by the condensation of phosphoenol pyruvate with d-arabinose-5-P and then activated by coupling to cytidine monophosphate (CMP) prior to its incorporation in the Golgi apparatus by a Kdo transferase (KDTA) into the nascent polysaccharide RG-II. To gain new insight into RG-II biosynthesis and function, we isolated and characterized null mutants for the unique putative KDTA (AtKDTA) encoded in the Arabidopsis genome. We provide evidence that, in contrast to mutants affecting the RG-II biosynthesis, the extinction of the AtKDTA gene expression does not result in any developmental phenotype in the AtkdtA plants. Furthermore, the structure of RG-II from the null mutants was not altered and contained wild-type amount of Rha-alpha(1-5)Kdo side chain. The cellular localization of AtKDTA was investigated by using laser scanning confocal imaging of the protein fused to green fluorescent protein. In agreement with its cellular prediction, the fusion protein was demonstrated to be targeted to the mitochondria. These data, together with data deduced from sequence analyses of higher plant genomes, suggest that AtKDTA encodes a putative KDTA involved in the synthesis of a mitochondrial not yet identified lipid A-like molecule rather than in the synthesis of the cell wall RG-II.
Collapse
Affiliation(s)
- Martial Séveno
- Laboratoire Glyco-MEV, UPRES-EA 4358, IFRMP 23, Université de Rouen, 76821 Mont-Saint-Aignan, France
| | | | | | | | | | | | | | | | | |
Collapse
|
20
|
Séveno M, Voxeur A, Rihouey C, Wu AM, Ishii T, Chevalier C, Ralet MC, Driouich A, Marchant A, Lerouge P. Structural characterisation of the pectic polysaccharide rhamnogalacturonan II using an acidic fingerprinting methodology. Planta 2009; 230:947-57. [PMID: 19672621 DOI: 10.1007/s00425-009-0996-1] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2009] [Accepted: 07/21/2009] [Indexed: 05/11/2023]
Abstract
Rhamnogalacturonan II (RG-II) is a structurally complex cell wall pectic polysaccharide. Despite its complexity, both the structure of RG-II and its ability to dimerise via a borate diester are conserved in vascular plants suggesting that RG-II has a fundamental role in primary cell wall organisation and function. The selection and analysis of new mutants affected in RG-II formation represents a promising strategy to unravel these functions and to identify genes encoding enzymes involved in RG-II biosynthesis. In this paper, a novel fingerprinting strategy is described for the screening of RG-II mutants based on the mild acid hydrolysis of RG-II coupled to the analysis of the resulting fragments by mass spectrometry. This methodology was developed using RG-II fractions isolated from citrus pectins and then validated for RG-II isolated from the Arabidopsis mur1 mutant and irx10 irx10-like double mutant.
Collapse
Affiliation(s)
- Martial Séveno
- EA 4358, IFRMP 23, University of Rouen, 76821 Mont Saint Aignan, France
| | | | | | | | | | | | | | | | | | | |
Collapse
|
21
|
Thouvenot E, Urbach S, Dantec C, Poncet J, Séveno M, Demettre E, Jouin P, Touchon J, Bockaert J, Marin P. Enhanced Detection of CNS Cell Secretome in Plasma Protein-Depleted Cerebrospinal Fluid. J Proteome Res 2008; 7:4409-21. [DOI: 10.1021/pr8003858] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Eric Thouvenot
- Centre National de la Recherche Scientifique, UMR 5203, Institut de Génomique Fonctionnelle, Montpellier, France, Institut National de la Santé et de la Recherche Médicale, U661, Montpellier, F-34094 France, Université Montpellier 1, Montpellier, F-34094 France, Université Montpellier 2, Montpellier, F-34094 France, and Service de Neurologie, Centre Hospitalier Universitaire de Montpellier, Montpellier, F-34295 France
| | - Serge Urbach
- Centre National de la Recherche Scientifique, UMR 5203, Institut de Génomique Fonctionnelle, Montpellier, France, Institut National de la Santé et de la Recherche Médicale, U661, Montpellier, F-34094 France, Université Montpellier 1, Montpellier, F-34094 France, Université Montpellier 2, Montpellier, F-34094 France, and Service de Neurologie, Centre Hospitalier Universitaire de Montpellier, Montpellier, F-34295 France
| | - Christelle Dantec
- Centre National de la Recherche Scientifique, UMR 5203, Institut de Génomique Fonctionnelle, Montpellier, France, Institut National de la Santé et de la Recherche Médicale, U661, Montpellier, F-34094 France, Université Montpellier 1, Montpellier, F-34094 France, Université Montpellier 2, Montpellier, F-34094 France, and Service de Neurologie, Centre Hospitalier Universitaire de Montpellier, Montpellier, F-34295 France
| | - Joël Poncet
- Centre National de la Recherche Scientifique, UMR 5203, Institut de Génomique Fonctionnelle, Montpellier, France, Institut National de la Santé et de la Recherche Médicale, U661, Montpellier, F-34094 France, Université Montpellier 1, Montpellier, F-34094 France, Université Montpellier 2, Montpellier, F-34094 France, and Service de Neurologie, Centre Hospitalier Universitaire de Montpellier, Montpellier, F-34295 France
| | - Martial Séveno
- Centre National de la Recherche Scientifique, UMR 5203, Institut de Génomique Fonctionnelle, Montpellier, France, Institut National de la Santé et de la Recherche Médicale, U661, Montpellier, F-34094 France, Université Montpellier 1, Montpellier, F-34094 France, Université Montpellier 2, Montpellier, F-34094 France, and Service de Neurologie, Centre Hospitalier Universitaire de Montpellier, Montpellier, F-34295 France
| | - Edith Demettre
- Centre National de la Recherche Scientifique, UMR 5203, Institut de Génomique Fonctionnelle, Montpellier, France, Institut National de la Santé et de la Recherche Médicale, U661, Montpellier, F-34094 France, Université Montpellier 1, Montpellier, F-34094 France, Université Montpellier 2, Montpellier, F-34094 France, and Service de Neurologie, Centre Hospitalier Universitaire de Montpellier, Montpellier, F-34295 France
| | - Patrick Jouin
- Centre National de la Recherche Scientifique, UMR 5203, Institut de Génomique Fonctionnelle, Montpellier, France, Institut National de la Santé et de la Recherche Médicale, U661, Montpellier, F-34094 France, Université Montpellier 1, Montpellier, F-34094 France, Université Montpellier 2, Montpellier, F-34094 France, and Service de Neurologie, Centre Hospitalier Universitaire de Montpellier, Montpellier, F-34295 France
| | - Jacques Touchon
- Centre National de la Recherche Scientifique, UMR 5203, Institut de Génomique Fonctionnelle, Montpellier, France, Institut National de la Santé et de la Recherche Médicale, U661, Montpellier, F-34094 France, Université Montpellier 1, Montpellier, F-34094 France, Université Montpellier 2, Montpellier, F-34094 France, and Service de Neurologie, Centre Hospitalier Universitaire de Montpellier, Montpellier, F-34295 France
| | - Joël Bockaert
- Centre National de la Recherche Scientifique, UMR 5203, Institut de Génomique Fonctionnelle, Montpellier, France, Institut National de la Santé et de la Recherche Médicale, U661, Montpellier, F-34094 France, Université Montpellier 1, Montpellier, F-34094 France, Université Montpellier 2, Montpellier, F-34094 France, and Service de Neurologie, Centre Hospitalier Universitaire de Montpellier, Montpellier, F-34295 France
| | - Philippe Marin
- Centre National de la Recherche Scientifique, UMR 5203, Institut de Génomique Fonctionnelle, Montpellier, France, Institut National de la Santé et de la Recherche Médicale, U661, Montpellier, F-34094 France, Université Montpellier 1, Montpellier, F-34094 France, Université Montpellier 2, Montpellier, F-34094 France, and Service de Neurologie, Centre Hospitalier Universitaire de Montpellier, Montpellier, F-34295 France
| |
Collapse
|
22
|
Séveno M, Cabrera G, Triguero A, Burel C, Leprince J, Rihouey C, Vézina LP, D'Aoust MA, Rudd PM, Royle L, Dwek RA, Harvey DJ, Lerouge P, Cremata JA, Bardor M. Plant N-glycan profiling of minute amounts of material. Anal Biochem 2008; 379:66-72. [PMID: 18482571 DOI: 10.1016/j.ab.2008.04.034] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2008] [Revised: 04/02/2008] [Accepted: 04/18/2008] [Indexed: 10/22/2022]
Abstract
Development of convenient strategies for identification of plant N-glycan profiles has been driven by the emergence of plants as an expression system for therapeutic proteins. In this article, we reinvestigated qualitative and quantitative aspects of plant N-glycan profiling. The extraction of plant proteins through a phenol/ammonium acetate procedure followed by deglycosylation with peptide N-glycosidase A (PNGase A) and coupling to 2-aminobenzamide provides an oligosaccharide preparation containing reduced amounts of contaminants from plant cell wall polysaccharides. Such a preparation was also suitable for accurate qualitative and quantitative evaluation of the N-glycan content by mass spectrometry. Combining these approaches allows the profiling to be carried out from as low as 500 mg of fresh leaf material. We also demonstrated that collision-induced dissociation (CID) mass spectrometry in negative mode of N-glycans harboring alpha(1,3)- or alpha(1,6)-fucose residue on the proximal GlcNAc leads to specific fragmentation patterns, thereby allowing the discrimination of plant N-glycans from those arising from mammalian contamination.
Collapse
Affiliation(s)
- Martial Séveno
- CNRS-FRE 3090, IFRMP 23, Université de Rouen, 76821 Mont Saint Aignan Cédex, France; Medicago Inc., Québec, QC G1V 3V9, Canada
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
23
|
Delmas F, Séveno M, Northey JGB, Hernould M, Lerouge P, McCourt P, Chevalier C. The synthesis of the rhamnogalacturonan II component 3-deoxy-D-manno-2-octulosonic acid (Kdo) is required for pollen tube growth and elongation. J Exp Bot 2008; 59:2639-47. [PMID: 18503041 PMCID: PMC2486460 DOI: 10.1093/jxb/ern118] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2008] [Accepted: 04/02/2008] [Indexed: 05/17/2023]
Abstract
Despite a very complex structure, the sugar composition of the rhamnogalacturonan II (RG-II) pectic fraction is extremely conserved. Among its constituting monosaccharides is the seldom-observed eight-carbon sugar 3-deoxy-D-manno-octulosonic acid (Kdo), whose phosphorylated precursor is synthesized by Kdo-8-P synthase. As an attempt to alter specifically the RG-II structure in its sugar composition and assess the consequences on the function of RG-II in cell wall and its relationship with growth, Arabidopsis null mutants were sought in the genes encoding Kdo-8-P synthase. Here, the isolation and characterization of one null mutant for the isoform 1 (AtkdsA1-S) and two distinct null mutants for the isoform 2 of Arabidopsis Kdo-8-P synthase (AtkdsA2-V and AtkdsA2-S) are described. Evidence is provided that AtkdsA2 gene expression is preferentially associated with plantlet organs displaying a meristematic activity, and that it accounts for 75% of the mRNAs to be translated into Kdo-8-P synthase. Furthermore, this predominant expression of AtKDSA2 over AtKDSA1 was confirmed by quantification of the cytosolic Kdo content in the mutants, in a variety of ecotypes. The inability to identify a double knockout mutant originated from pollen abortions, due to the inability of haploid pollen of the AtkdsA1- AtkdsA2- genotype to form an elongated pollen tube properly and perform fertilization.
Collapse
Affiliation(s)
- Frédéric Delmas
- INRA (Institut National de la Recherche Agronomique), Unité Mixte de Recherche 619 sur la Biologie du Fruit, Institut Fédératif de Recherche 103, F-33883 Villenave d'Ornon, France
- University of Toronto, Cell and Systems Biology Laboratory, 25 Willcocks Street, Toronto, Ontario M5S3B2, Canada
| | - Martial Séveno
- Centre National de la Recherche Scientifique, Unité Mixte de Recherche 6037, Laboratoire des Transports Intracellulaires, IFRMP 23, Université de Rouen, F-76821 Mont Saint Aignan, France
| | - Julian G. B. Northey
- University of Toronto, Cell and Systems Biology Laboratory, 25 Willcocks Street, Toronto, Ontario M5S3B2, Canada
| | - Michel Hernould
- INRA (Institut National de la Recherche Agronomique), Unité Mixte de Recherche 619 sur la Biologie du Fruit, Institut Fédératif de Recherche 103, F-33883 Villenave d'Ornon, France
- Université Victor Segalen Bordeaux 2, Unité Mixte de Recherche 619 sur la Biologie du Fruit, Institut Fédératif de Recherche 103, F-33883 Villenave d'Ornon, France
| | - Patrice Lerouge
- Centre National de la Recherche Scientifique, Unité Mixte de Recherche 6037, Laboratoire des Transports Intracellulaires, IFRMP 23, Université de Rouen, F-76821 Mont Saint Aignan, France
| | - Peter McCourt
- University of Toronto, Cell and Systems Biology Laboratory, 25 Willcocks Street, Toronto, Ontario M5S3B2, Canada
| | - Christian Chevalier
- INRA (Institut National de la Recherche Agronomique), Unité Mixte de Recherche 619 sur la Biologie du Fruit, Institut Fédératif de Recherche 103, F-33883 Villenave d'Ornon, France
- Université Victor Segalen Bordeaux 2, Unité Mixte de Recherche 619 sur la Biologie du Fruit, Institut Fédératif de Recherche 103, F-33883 Villenave d'Ornon, France
- To whom correspondence should be addressed. E-mail:
| |
Collapse
|
24
|
Lerouxel O, Mouille G, Andème-Onzighi C, Bruyant MP, Séveno M, Loutelier-Bourhis C, Driouich A, Höfte H, Lerouge P. Mutants in DEFECTIVE GLYCOSYLATION, an Arabidopsis homolog of an oligosaccharyltransferase complex subunit, show protein underglycosylation and defects in cell differentiation and growth. Plant J 2005; 42:455-68. [PMID: 15860005 DOI: 10.1111/j.1365-313x.2005.02392.x] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
A mutant called defective glycosylation1-1 (dgl1-1) was identified in Arabidopsis based on a growth defect of the dark-grown hypocotyl and an abnormal composition of the non-cellulosic cell wall polysaccharides. dgl1-1 is altered in a protein ortholog of human OST48 or yeast WBP1, an essential protein subunit of the oligosaccharyltransferase (OST) complex, which is responsible for the transfer in the ER of the N-linked glycan precursor onto Asn residues of candidate proteins. Consistent with the known function of the OST complex in eukaryotes, the dgl1-1 mutation led to a reduced N-linked glycosylation of the ER-resident protein disulfide isomerase. A second more severe mutant (dgl1-2) was embryo-lethal. Microscopic analysis of dgl1-1 revealed developmental defects including reduced cell elongation and the collapse and differentiation defects of cells in the central cylinder. These defects were accompanied by changes in the non-cellulosic polysaccharide composition, including the accumulation of ectopic callose. Interestingly, in contrast to other dwarf mutants that are altered in early steps of the N-glycan processing, dgl1-1 did not exhibit a cellulose deficiency. Together, these results confirm the role of DGL1 in N-linked glycosylation, cell growth and differentiation in plants.
Collapse
Affiliation(s)
- Olivier Lerouxel
- Unité Mixte de Recherche 6037 Centre National de la Recherche Scientifique, IFRMP 23, Faculté des Sciences, Université de Rouen, 76821 Mont Saint Aignan Cedex, France
| | | | | | | | | | | | | | | | | |
Collapse
|
25
|
|
26
|
van Oort E, Lerouge P, de Heer PG, Séveno M, Coquet L, Modderman PW, Faye L, Aalberse RC, van Ree R. Substitution of Pichia pastoris-derived recombinant proteins with mannose containing O- and N-linked glycans decreases specificity of diagnostic tests. Int Arch Allergy Immunol 2004; 135:187-95. [PMID: 15467371 DOI: 10.1159/000081303] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2004] [Accepted: 08/03/2004] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Recombinant proteins from Pichia pastoris need to be fully evaluated before used as diagnostic tools. OBJECTIVE The objective of this study was to investigate whether glycosylation by P. pastoris interferes with the specificity of diagnostic tests. METHODS An autoantigen involved in Wegener's disease (protease 3) and 2 major inhalant allergens from grass pollen (Dac g 5) and house dust mite (Der p 1) were produced as recombinant molecules in P. pastoris. O-linked glycans on Dac g 5 were characterized by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry. The immune reactivity of the recombinant proteins was compared to that of their natural counterparts by ELISA and a radio-allergosorbent test (RAST) as well as by ELISA and RAST inhibition. RESULTS In contrast to the non-glycosylated natural allergen, recombinant Dac g 5 was shown to carry at least 2 small mannose-containing O-glycans. We showed that both these O-glycans and the N-linked glycans on recombinant protease 3 and recombinant Der p 1 were recognized in ELISA by IgG antibodies in sera of healthy individuals. These IgG responses were closely correlated. The natural autoantigen and allergens were not recognized by IgG antibodies from healthy subjects. The carbohydrate nature of the epitopes recognized by IgG on the recombinant proteins was confirmed by inhibition studies with mannose and yeast mannan. IgE recognition of yeast glycans was observed in 2 out of 9 positive sera from patients with allergic bronchopulmonary aspergillosis. CONCLUSION Production of recombinant molecules in yeast (or moulds) can introduce IgG-binding glycans that negatively affect the specificity of diagnostic tests.
Collapse
Affiliation(s)
- Erica van Oort
- Sanquin, Department of Immunopathology and Laboratory for Experimental and Clinical Immunology, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
| | | | | | | | | | | | | | | | | |
Collapse
|
27
|
Delmas F, Petit J, Joubès J, Séveno M, Paccalet T, Hernould M, Lerouge P, Mouras A, Chevalier C. The gene expression and enzyme activity of plant 3-deoxy-D-manno-2-octulosonic acid-8-phosphate synthase are preferentially associated with cell division in a cell cycle-dependent manner. Plant Physiol 2003; 133:348-60. [PMID: 12970500 PMCID: PMC196611 DOI: 10.1104/pp.103.026872] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2003] [Revised: 06/12/2003] [Accepted: 06/16/2003] [Indexed: 05/03/2023]
Abstract
3-deoxy-D-manno-2-octulosonic acid-8-phosphate (Kdo-8-P) synthase catalyzes the condensation of phosphoenolpyruvate with D-arabinose-5-phosphate to yield Kdo-8-P. Kdo-8-P is the phosphorylated precursor of Kdo, a rare sugar only found in the rhamnogalacturonan II pectic fraction of the primary cell walls of higher plants and of cell wall polysaccharides of some green algae. A cDNA named LekdsA (accession no. AJ294902) encoding tomato (Lycopersicon esculentum) Kdo-8-P synthase has been isolated. The recombinant protein rescued a kdsA thermosensitive mutant of Salmonella typhimurium impaired in the synthesis of a functional Kdo-8-P synthase. Using site-directed mutagenesis of LekdsA cDNA, the tomato Kdo-8-P synthase was shown to possess the same essential amino acids that form the active sites in the bacterial enzymes. The tomato kdsA gene expression and the relevant Kdo-8-P synthase activity were preferentially associated to dividing cells, in the course of the early development of tomato fruit and in meristematic tissues. Furthermore, the transcription of the kdsA gene was found to oscillate during the cell cycle in tobacco (Nicotiana tabacum) Bright-Yellow 2 synchronized cells with a maximum during mitosis.
Collapse
MESH Headings
- Aldehyde-Lyases/genetics
- Aldehyde-Lyases/metabolism
- Amino Acid Sequence
- Cell Cycle/genetics
- Cell Cycle/physiology
- Cell Division/genetics
- Cell Division/physiology
- Cloning, Molecular
- DNA, Complementary/chemistry
- DNA, Complementary/genetics
- Fruit/enzymology
- Fruit/genetics
- Fruit/growth & development
- Gene Expression Regulation, Developmental
- Gene Expression Regulation, Enzymologic
- Gene Expression Regulation, Plant
- Hypocotyl/enzymology
- Hypocotyl/genetics
- Hypocotyl/growth & development
- Solanum lycopersicum/enzymology
- Solanum lycopersicum/genetics
- Solanum lycopersicum/growth & development
- Molecular Sequence Data
- Mutagenesis, Site-Directed
- Mutation
- Plant Proteins/genetics
- Plant Proteins/metabolism
- RNA, Messenger/genetics
- RNA, Messenger/metabolism
- Sequence Analysis, DNA
- Sequence Homology, Amino Acid
- Nicotiana/enzymology
- Nicotiana/genetics
Collapse
Affiliation(s)
- Frédéric Delmas
- Unité Mixte de Recherche 619 de Physiologie et Biotechnologie Végétales, Institut de Biologie Végétale Moléculaire, Centre de Recherche Institut National de la Recherche Agronomique-Bordeaux, boite postale 81, 33883 Villenave d'Ornon cedex, France
| | | | | | | | | | | | | | | | | |
Collapse
|
28
|
Lerouxel O, Choo TS, Séveno M, Usadel B, Faye L, Lerouge P, Pauly M. Rapid structural phenotyping of plant cell wall mutants by enzymatic oligosaccharide fingerprinting. Plant Physiol 2002; 130:1754-63. [PMID: 12481058 PMCID: PMC1540271 DOI: 10.1104/pp.011965] [Citation(s) in RCA: 95] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
Various biochemical, chemical, and microspectroscopic methods have been developed throughout the years for the screening and identification of mutants with altered cell wall structure. However, these procedures fail to provide the insight into structural aspects of the cell wall polymers. In this paper, we present various methods for rapidly screening Arabidopsis cell wall mutants. The enzymatic fingerprinting procedures using high-performance anion-exchange-pulsed-amperometric detection liquid chromatography, fluorophore-assisted carbohydrate electrophoresis, and matrix-assisted laser-desorption ionization time of flight (MALDI-TOF) mass spectrometry (MS) were exemplified by the structural analysis of the hemicellulose xyloglucan. All three techniques are able to identify structural alterations of wall xyloglucans in mur1, mur2, and mur3, which in comparison with the wild type have side chain defects in their xyloglucan structure. The quickest analysis was provided by MALDI-TOF MS. Although MALDI-TOF MS per se is not quantitative, it is possible to reproducibly obtain relative abundance information of the various oligosaccharides present in the extract. The lack of absolute quantitation by MALDI-TOF MS was compensated for with a xyloglucan-specific endoglucanase and simple colorimetric assay. In view of the potential for mass screening using MALDI-TOF MS, a PERL-based program was developed to process the spectra obtained from MALDI-TOF MS automatically. Outliers can be identified very rapidly according to a set of defined parameters based on data collected from the wild-type plants. The methods presented here can easily be adopted for the analysis of other wall polysaccharides. MALDI-TOF MS offers a powerful tool to screen and identify cell wall mutants rapidly and efficiently and, more importantly, is able to give initial insights into the structural composition and/or modification that occurs in these mutants.
Collapse
Affiliation(s)
- Olivier Lerouxel
- Centre National de la Recherche Scientifique Unité Mixte de Recherche 6037, Institute Federative de Recherche Multidisciplinaire sur les Peptides 23, University of Rouen, 76821 Mont Saint Aignan, France
| | | | | | | | | | | | | |
Collapse
|