The budding yeast Start repressor Whi7 differs in regulation from Whi5, emerging as a major cell cycle brake in response to stress.
Fiche publication
Date publication
décembre 2020
Journal
Journal of cell science
Auteurs
Membres identifiés du Cancéropôle Est :
Dr MENDOZA Manuel
Tous les auteurs :
Méndez E, Gomar-Alba M, Bañó MC, Mendoza M, Quilis I, Igual JC
Lien Pubmed
Résumé
Start is the main decision point in the eukaryotic cell cycle at which cells commit to a new round of cell division. It involves the irreversible activation of a transcriptional programme through the inactivation of Start transcriptional repressors: the retinoblastoma family in mammals, or Whi5 and its recently identified paralogue Whi7 (also known as Srl3) in budding yeast. Here, we provide a comprehensive comparison of Whi5 and Whi7 that reveals significant qualitative differences. Indeed, the expression, subcellular localization and functionality of Whi7 and Whi5 are differentially regulated. Importantly, Whi7 shows specific properties in its association with promoters not shared by Whi5, and for the first time, we demonstrate that Whi7, and not Whi5, can be the main contributor to Start inhibition such as it occurs in the response to cell wall stress. Our results help to improve understanding of the interplay between multiple differentially regulated Start repressors in order to face specific cellular conditions.
Mots clés
Cell cycle, Start, Stress, Whi5, Whi7
Référence
J Cell Sci. 2020 Dec 21;133(24):