9gw2
From Proteopedia
State 2 MAP 1 SETD2 bound to proximal H3 of upstream nucleosome
Structural highlights
FunctionSETD2_HUMAN Histone methyltransferase that methylates 'Lys-36' of histone H3. H3 'Lys-36' methylation represents a specific tag for epigenetic transcriptional activation. Probably plays a role in chromatin structure modulation during elongation via its interaction with hyperphosphorylated POLR2A. Binds DNA at promoters. May also act as a transcription activator that binds to promoters. Binds to the promoters of adenovirus 12 E1A gene in case of infection, possibly leading to regulate its expression.[1] Publication Abstract from PubMedH3K36me3 is a hallmark of actively and recently transcribed genes and contributes to cellular memory and identity. The deposition of H3K36me3 occurs co-transcriptionally when the methyltransferase SETD2 associates with RNA polymerase II. Here we present three cryo-EM structures of SETD2 bound to RNA polymerase II elongation complexes at different states of nucleosome passage. Together with functional probing, our results suggest a 3-step mechanism of transcription-coupled H3K36me3 deposition. First, binding to the elongation factor SPT6 tethers the catalytic SET domain in proximity to the upstream DNA. Second, RNA polymerase II nucleosome passage leads to the transfer of a hexasome from downstream to upstream, poised for methylation. Finally, continued transcription leads to upstream nucleosome reassembly, partial dissociation of the histone chaperone FACT and sequential methylation of both H3 tails, completing H3K36me3 deposition of an upstream nucleosome after RNA polymerase II passage. Molecular mechanism of co-transcriptional H3K36 methylation by SETD2.,Walshe JL, Ochmann M, Neef U, Dybkov O, Dienemann C, Oberthur C, Zheenbekova A, Urlaub H, Cramer P Nat Commun. 2025 Oct 29;16(1):9565. doi: 10.1038/s41467-025-65439-y. PMID:41162378[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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