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-Structure paper
タイトル | Activation of automethylated PRC2 by dimerization on chromatin. |
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ジャーナル・号・ページ | Mol Cell, Vol. 84, Issue 20, Page 3885-33898.e8, Year 2024 |
掲載日 | 2024年10月17日 |
著者 | Paul V Sauer / Egor Pavlenko / Trinity Cookis / Linda C Zirden / Juliane Renn / Ankush Singhal / Pascal Hunold / Michaela N Hoehne-Wiechmann / Olivia van Ray / Farnusch Kaschani / Markus Kaiser / Robert Hänsel-Hertsch / Karissa Y Sanbonmatsu / Eva Nogales / Simon Poepsel / |
PubMed 要旨 | Polycomb repressive complex 2 (PRC2) is an epigenetic regulator that trimethylates lysine 27 of histone 3 (H3K27me3) and is essential for embryonic development and cellular differentiation. H3K27me3 ...Polycomb repressive complex 2 (PRC2) is an epigenetic regulator that trimethylates lysine 27 of histone 3 (H3K27me3) and is essential for embryonic development and cellular differentiation. H3K27me3 is associated with transcriptionally repressed chromatin and is established when PRC2 is allosterically activated upon methyl-lysine binding by the regulatory subunit EED. Automethylation of the catalytic subunit enhancer of zeste homolog 2 (EZH2) stimulates its activity by an unknown mechanism. Here, we show that human PRC2 forms a dimer on chromatin in which an inactive, automethylated PRC2 protomer is the allosteric activator of a second PRC2 that is poised to methylate H3 of a substrate nucleosome. Functional assays support our model of allosteric trans-autoactivation via EED, suggesting a previously unknown mechanism mediating context-dependent activation of PRC2. Our work showcases the molecular mechanism of auto-modification-coupled dimerization in the regulation of chromatin-modifying complexes. |
リンク | Mol Cell / PubMed:39303719 |
手法 | EM (単粒子) |
解像度 | 3.1 - 6.2 Å |
構造データ | EMDB-41110, PDB-8t9g: EMDB-41141, PDB-8tas: EMDB-41146, PDB-8tb9: EMDB-41147: H1-nucleosome (chromatosome) |
化合物 | ChemComp-SAH: |
由来 |
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キーワード | GENE REGULATION / Histone methyl transferase / gene repression / epigenetics / chromatin |