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Gubar O, Croisé P, Kropyvko S, Gryaznova T, Tóth P, Blangy A, Vitale N, Rynditch A, Gasman S, Ory S. The atypical Rho GTPase RhoU interacts with intersectin-2 to regulate endosomal recycling pathways. J Cell Sci 2020; 133:jcs234104. [PMID: 32737221 DOI: 10.1242/jcs.234104] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [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: 05/08/2019] [Accepted: 07/21/2020] [Indexed: 01/22/2023] Open
Abstract
Rho GTPases play a key role in various membrane trafficking processes. RhoU is an atypical small Rho GTPase related to Rac/Cdc42, which possesses unique N- and C-terminal domains that regulate its function and its subcellular localization. RhoU localizes at the plasma membrane, on endosomes and in cell adhesion structures where it governs cell signaling, differentiation and migration. However, despite its endomembrane localization, RhoU function in vesicular trafficking has been unexplored. Here, we identified intersectins (ITSNs) as new binding partners for RhoU and showed that the second PxxP motif at the N terminus of RhoU mediated interactions with the SH3 domains of ITSNs. To evaluate the function of RhoU and ITSNs in vesicular trafficking, we used fluorescent transferrin as a cargo for uptake experiments. We showed that silencing of either RhoU or ITSN2, but not ITSN1, increased transferrin accumulation in early endosomes, resulting from a defect in fast vesicle recycling. Concomitantly, RhoU and ITSN2 colocalized to a subset of Rab4-positive vesicles, suggesting that a RhoU-ITSN2 interaction may occur on fast recycling endosomes to regulate the fate of vesicular cargos.
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Affiliation(s)
- Olga Gubar
- Centre National de la Recherche Scientifique, Université de Strasbourg, Institut des Neurosciences Cellulaires et Intégratives, F-67000 Strasbourg, France
- Institute of Molecular Biology and Genetics NASU, 150 Zabolotnogo Street, Kyiv 03680, Ukraine
| | - Pauline Croisé
- Centre National de la Recherche Scientifique, Université de Strasbourg, Institut des Neurosciences Cellulaires et Intégratives, F-67000 Strasbourg, France
| | - Sergii Kropyvko
- Institute of Molecular Biology and Genetics NASU, 150 Zabolotnogo Street, Kyiv 03680, Ukraine
| | - Tetyana Gryaznova
- Institute of Molecular Biology and Genetics NASU, 150 Zabolotnogo Street, Kyiv 03680, Ukraine
| | - Petra Tóth
- Centre National de la Recherche Scientifique, Université de Strasbourg, Institut des Neurosciences Cellulaires et Intégratives, F-67000 Strasbourg, France
| | - Anne Blangy
- Centre de Recherche en Biologie Cellulaire de Montpellier (CRBM), Univ. Montpellier, CNRS, 34000 Montpellier, France
| | - Nicolas Vitale
- Centre National de la Recherche Scientifique, Université de Strasbourg, Institut des Neurosciences Cellulaires et Intégratives, F-67000 Strasbourg, France
| | - Alla Rynditch
- Institute of Molecular Biology and Genetics NASU, 150 Zabolotnogo Street, Kyiv 03680, Ukraine
| | - Stéphane Gasman
- Centre National de la Recherche Scientifique, Université de Strasbourg, Institut des Neurosciences Cellulaires et Intégratives, F-67000 Strasbourg, France
| | - Stéphane Ory
- Centre National de la Recherche Scientifique, Université de Strasbourg, Institut des Neurosciences Cellulaires et Intégratives, F-67000 Strasbourg, France
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