The abstract is read at the publisher; the summary is JClub's.
H3 acetylation at Lys56 and Lys122 markedly enhances RNAPII transcription through nucleosomes, while H3K64 acetylation has little effect.
- Why it matters: Site-specific H3 acetylation is known to regulate chromatin and transcription, but the structural mechanism linking individual acetylation sites to RNAPII passage through nucleosomes was unclear.
- What they did: Using cryo-EM, the study determined nucleosome structures bearing site-specific acetylation at H3K56, H3K64, or H3K122 to compare how each modification alters histone–DNA contacts.
- The result: H3K56ac and H3K122ac weaken histone–DNA interactions at the DNA entry/exit region and near the dyad, respectively, whereas H3K64ac shows no detectable structural changes, aligning with transcriptional outcomes.
The findingWhy it mattersWhat they didThe result
AI summary of the abstract · may contain errors · not medical advice · read the paper.