BRCA1/BARD1 E3 ubiquitin ligase can modify histones H2A and H2B in the nucleosome particle

Journal of Biomolecular Structure & Dynamics
Amit ThakarJordanka Zlatanova

Abstract

BRCA1, the protein product of the Breast Cancer Susceptibility Gene (BRCA1) has been implicated in multiple pathways that preserve genome stability, including cell cycle control, DNA repair, transcription, and chromatin remodeling. BRCA1, in complex with another RING-domain protein BARD1, possesses ubiquitin-ligase activity. Only a few targets for this activity have been identified in vivo. Nucleosomal histones may also be targets in vivo since they can be modified by the BRCA1/BARD1 complex in vitro. Here we demonstrate that the BRCA1/BARD1 complex can ubiquitylate both free H2A and H2B histones and histones in the context of nucleosomal particles. These results raise the possibility that BRCA1/BARD1 can directly affect nucleosomal structure, dynamics, and function through its ability to modify nucleosomal histones.

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