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<dc:title xml:lang="fr">MOSPD2 et sites de contact membranaire : une protéine à plusieurs facettes</dc:title>
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<dc:subject xml:lang="fr">Site de contact membranaire</dc:subject>
<dc:subject xml:lang="fr">Réticulum endoplasmique</dc:subject>
<dc:subject xml:lang="fr">Métabolisme lipidique</dc:subject>
<dc:subject xml:lang="fr">Transport de lipide</dc:subject>
<dc:subject xml:lang="en">Membrane contact site</dc:subject>
<dc:subject xml:lang="en">Endoplasmic reticulum</dc:subject>
<dc:subject xml:lang="en">Lipid metabolism</dc:subject>
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<dcterms:abstract xml:lang="fr">A l’image des protéines VAPs, MOSPD2 est une protéine ancrée à la surface du réticulum endoplasmique (ER), formant des sites de contacts membranaires (MCS) grâce à son domaine MSP via une interaction protéine-protéine. Contrairement aux VAPs, MOSPD2 possède un domaine additionnel, nommé, CRAL-TRIO, dont la fonction restait à ce jour incertaine. Les travaux réalisés dans cette thèse ont permis de mieux comprendre comment MOSPD2 se distingue fonctionnellement des protéines VAPs. MOSPD2 est capable de former des MCS entre le ER et les gouttelettes lipidiques via son domaine CRAL-TRIO, régulant ainsi le métabolisme lipidique. En plus de cette localisation spécifique à MOSPD2, cette protéine se distingue aussi des protéines VAPs par sa forte affinité d’interaction médiée par son domaine MSP avec la protéine endosomale STARD3, permettant la régulation du système endosomal tardif. Cette interaction n’est pas substituable par les protéines VAPs qui possèdent pourtant également un domaine MSP, démontrant ainsi l’importance des affinités d’interaction entre les membres de cette famille et leurs conséquences fonctionnelles in vivo.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Like VAP proteins, MOSPD2 is an endoplasmic reticulum (ER)-anchored protein forming membrane contact sites (MCS) through its MSP domain via protein-protein interactions. In contrast to VAP proteins, MOSPD2 has an additional domain, named CRAL-TRIO, whose function remained unclear until now. The work carried out in this thesis has allowed us to better understand how MOSPD2 is functionally distinct from VAPs. MOSPD2 can form MCSs between the ER and lipid droplets via its CRAL-TRIO domain, thus regulating lipid metabolism. In addition to this specific localization, MOSPD2 differs from VAP proteins by its MSP-mediated interaction with the endosomal protein STARD3, enabling the regulation of the late endosomal system. This interaction is not substitutable by the VAP proteins that also possess an MSP domain, thus demonstrating the importance of binding affinities between the members of this family and their functional consequences in vivo.</dcterms:abstract>
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