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-Structure paper
| タイトル | Structural mechanism of H3K27 demethylation and crosstalk with heterochromatin markers. |
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| ジャーナル・号・ページ | Mol Cell, Vol. 85, Issue 15, Page 2869-22884.e6, Year 2025 |
| 掲載日 | 2025年8月7日 |
著者 | Chien-Chu Lin / Yani Zhao / Caroline A Foley / Aspen T Hawkins / Lindsey I James / Stephen V Frye / Robert K McGinty / ![]() |
| PubMed 要旨 | Histone H3 lysine 27 trimethylation (H3K27me3) is a repressive histone modification that is a hallmark of facultative heterochromatin. H3K27me3 is installed by the polycomb repressive complex 2 (PRC2) ...Histone H3 lysine 27 trimethylation (H3K27me3) is a repressive histone modification that is a hallmark of facultative heterochromatin. H3K27me3 is installed by the polycomb repressive complex 2 (PRC2) and removed by KDM6 family Jumonji C (JmjC) domain demethylases. Structural studies have elucidated how PRC2 functions on nucleosomes and its regulation by local histone modification signatures. However, the molecular mechanisms governing H3K27 demethylation to reactivate silenced chromatin remain poorly understood. Here, we report the cryoelectron microscopy (cryo-EM) structure of mouse KDM6B bound to the nucleosome. Our structure shows how KDM6B engages wrapped nucleosomal DNA together with both extranucleosomal DNA linkers to position its catalytic JmjC domain for H3K27 demethylation. KDM6B induces an overlapped linker DNA conformation consistent with function in a compact chromatin environment. We further show that linker histones and H2AK119ub1, both enriched in heterochromatin, antagonize KDM6B function, suggesting that linker histone eviction and H2A deubiquitylation precede H3K27 demethylation during heterochromatin activation. |
リンク | Mol Cell / PubMed:40683254 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 3.16 - 4.46 Å |
| 構造データ | EMDB-49676, PDB-9nqu: ![]() EMDB-71691: Consensus map of mouse KDM6B in complex with nucleosome ![]() EMDB-71692: Focused map of NCP+trans-linker DNA ![]() EMDB-71693: Focused map of mouse KDM6B+cis-linker DNA |
| 化合物 | ![]() ChemComp-FE: ![]() ChemComp-ZN: ![]() ChemComp-OH0: |
| 由来 |
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キーワード | GENE REGULATION/DNA / histone H3K27 demethylation / GENE REGULATION / histone / chromatin / epigenetics / GENE REGULATION-DNA complex |
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