Mapping the deubiquitination module within the SAGA complex.
Fiche publication
Date publication
novembre 2014
Auteurs
Membres identifiés du Cancéropôle Est :
Dr SCHULTZ Patrick
Tous les auteurs :
Durand A, Bonnet J, Fournier M, Chavant V, Schultz P
Lien Pubmed
Résumé
The molecular organization of the yeast transcriptional coactivator Spt-Ada-Gcn5 acetyltransferase (SAGA) was analyzed by single-particle electron microscopy. Complete or partial deletion of the Sgf73 subunit disconnects the deubiquitination (DUB) module from SAGA and favors in our conditions the cleavage of the C-terminal ends of the Spt7 subunit and the loss of the Spt8 subunit. The structural comparison of the wild-type SAGA with two deletion mutants positioned the DUB module and enabled the fitting of the available atomic models. The localization of the DUB module close to Gcn5 defines a chromatin-binding interface within SAGA, which could be demonstrated by the binding of nucleosome core particles. The TATA-box binding protein (TBP)-interacting subunit Spt8 was found to be located close to the DUB but in a different domain than Spt3, also known to contact TBP. A flexible protein arm brings both subunits close enough to interact simultaneously with TBP.
Référence
Structure. 2014 Nov 4;22(11):1553-9.