Genomics

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Effect of Rad6 backside beta-turn mutations on the chromatin occupancy of the histone H2B ubiquitin-conjugating complex subunits


ABSTRACT: Rad6 E2 ubiquitin-conjugating enzyme and Bre1 E3 ubiquitin ligase catalyze histone H2B Lysine-123 monoubiquitination (H2Bub1), which stabilizes nucleosomes and regulates the trans-histone H3K4 and K79 methylation during gene transcription and other nuclear processes. The interaction interfaces within the Rad6-Bre1-containing H2B ubiquitin-conjugating complex has remained unknown. By solving the crystal structure of Rad6 along with a non-RING domain N-terminal region of Bre1, we report a beta-turn in Rad6's so-called backside region away from catalytic pocket as a binding site for a homodimer of Bre1 E3 ligase. Using quantitative ChIP-seq or ChIP-Rx, we further demonstrate that Rad6's backside beta-turn residues also govern the chromatin binding dynamics of the Rad6-Bre1 complex.

ORGANISM(S): Saccharomyces cerevisiae

PROVIDER: GSE139633 | GEO | 2022/10/24

REPOSITORIES: GEO

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