Monoubiquitination of histone H2B is intrinsic to the Bre1 RING domain-Rad6 interaction and augmented by a second Rad6-binding site on Bre1.

ABSTRACT: Ubiquitin signaling on chromatin is linked to diverse aspects of genome regulation, including gene expression and DNA repair. The yeast RING E3 ligase Bre1 combines with the E2 Rad6 to monoubiquitinate histone H2B during transcription. Little is known about how Bre1 directs Rad6 toward transferring only a single ubiquitin to a specific lysine residue. Using a defined in vitro system, we show that the Bre1 RING domain interaction with Rad6 is minimally sufficient to monoubiquitinate nucleosomes at histone H2B Lys-123. In addition, we reveal a cluster of charged residues on the Bre1 RING domain that is critical for recognizing the nucleosome surface. Notably, a second Rad6 binding domain of Bre1 interacts with the E2 backside and potentiates ubiquitin transfer to the substrate. Taken togethe

SUBMITTER: Turco E 

PROVIDER: S-EPMC4342449 | biostudies-literature | 2015 Feb

REPOSITORIES: biostudies-literature