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<dc:title xml:lang="en">Role of novel ubiquitin-related factors in cell cycle progression</dc:title>
<dcterms:alternative xml:lang="fr">Rôle de nouveaux facteurs liés à l'ubiquitine dans la progression du cycle cellulaire</dcterms:alternative>
<dc:subject xml:lang="fr">Ubiquitylation</dc:subject>
<dc:subject xml:lang="fr">Cycle cellulaire</dc:subject>
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<dc:subject xml:lang="fr">Aurora B</dc:subject>
<dc:subject xml:lang="fr">Ségrégation chromosomique</dc:subject>
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<dc:subject xml:lang="fr">FXRPs</dc:subject>
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<dc:subject xml:lang="fr">NPCs</dc:subject>
<dc:subject xml:lang="en">Ubiquitylation</dc:subject>
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<dcterms:abstract xml:lang="fr">L'ubiquitylation est une modification post-traductionnelle qui joue de nombreuses fonctions importantes dans les cellules. Au cours de mon doctorat, je me suis concentré sur deux composants du système d'ubiquitine : l'enzyme de déubiquitination (DUB) ubiquitine carboxyl-terminal esterase L3 (UCHL3) et la protéine à domaine de liaison à l'ubiquitine (UBD) ubiquitin associated protein 2 like (UBAP2L, également connue sous le nom de NICE4). Mes études ont montré que l'UCHL3 est nécessaire au maintien de la forme nucléaire des cellules humaines et à la ségrégation des chromosomes. Au niveau moléculaire, UCHL3 interagit physiquement avec Aurora B et la déubiquitylise, régulant ainsi sa localisation au niveau des kinétochores et son interaction avec MCAK. Dans mon deuxième projet, j'ai identifié une nouvelle fonction d'UBAP2L dans la régulation des protéines liées au syndrome de retard mental du X fragile (FXRPs) et dans l'homéostasie des complexes de pores nucléaires (NPCs), qui, étonnamment, est indépendante de la liaison à l'ubiquitine d'UBAP2L. Au lieu de cela, j'ai découvert que les arginines dans le domaine arginine-glycine-glycine (RGG) de UBAP2L sont nécessaires pour l'interaction avec les FXRPs, et médient la fonction sur les FXRPs et les nucléoporines (Nups) au début de la phase G1.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Ubiquitylation is a posttranslational modification which plays many important functions in cells. During my PhD study, I focused on two components of the ubiquitin system : the deubiquitinating enzyme (DUB) ubiquitin carboxyl-terminal esterase L3 (UCHL3) and the ubiquitin-binding domain (UBD) protein ubiquitin associated protein 2 like (UBAP2L, also known as NICE4). My studies showed that UCHL3 is necessary for maintaining proper nuclear shape of human cells and chromosome segregation. At the molecular level, UCHL3 physically interacts with and deubiquitylates Aurora B, thereby regulating its localization at the kinetochores and interaction with MCAK. In my second project, I identified a novel function of UBAP2L in the regulation of Fragile X mental retardation syndrome-related proteins (FXRPs) and in the nuclear pore complexes (NPCs) homeostasis, which surprisingly, is independent of UBAP2L ubiquitin-binding. Instead, I found that the arginines within the arginine–glycine–glycine (RGG) domain of UBAP2L are required for the interaction with FXRPs, and mediate the function on FXRPs and nucleoporins (Nups) in early G1 phase.</dcterms:abstract>
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