Histone H2B S112 O-GlcNAcylation facilitates H2B K120 monoubiquitylation, which promotes transcriptional activation; however, the mechanism is unknown. Structural and biochemical characterization reveals that the O-GlcNAc moiety has a unique role by allosterically activating the E2 enzyme RAD6A and directly enhancing its enzymatic activity.
- Zhiheng Deng
- Shixian Tao
- Huasong Ai