1 resultado para Mitotic Exit
em Université Laval Mémoires et thèses électroniques
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Resumo:
BubR1 est une protéine importante dans le point de contrôle de la mitose pour la stabilisation des interactions entre kinétochores et microtubules (KT-MT). Ces fonctions protègent de la ségrégation anormale des chromosomes et de l’instabilité du génome. BubR1 possède des sites de phosphorylation mitotique hautement conservés dans le domaine régulant l’attachement des kinétochores (KARD), où S676 et S670 sont phosphorylées respectivement par la kinase polo-like 1 (Plk1) et par la kinase cycline-dépendante 1 (Cdk1). Ces sites de phosphorylation sont essentiels pour le recrutement de la phosphatase PP2A-B56, qui stabilise les interactions KT-MT. Nos résultats montrent que la délétion entière ou des mutations qui déstabilisent le domaine pseudokinase de BubR1, causent la perte de phosphorylation des résidus S676 et S670 en mitose. Notre hypothèse est que le domaine pseudokinase de BubR1 peut jouer un rôle essentiel dans la régulation de la phosphorylation du KARD et donc dans la stabilisation des interactions KT-MT.