- EMDB-0654: Structural basis of Dot1L stimulation by histone H2B lysine 120 u... -
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データベース: EMDB / ID: EMD-0654
タイトル
Structural basis of Dot1L stimulation by histone H2B lysine 120 ubiquitination. 5.2A reconstruction of Dot1L on H2BK120Ub nucleosome
マップデータ
Result of cisTEM refinement, filtered to 5.2A, not sharpened. This map is in the same environment as the model constructed. It is shifted and resampled to fit with the environment of the paper
試料
複合体: Cryo-EM structure of human Dot1L bound to H2BK120Ub nucleosome at 5.2A resolution
National Institutes of Health/National Human Genome Research Institute
5R01GM115882-03
米国
Other private
David and Lucille Packard Foundation
米国
引用
ジャーナル: Mol Cell / 年: 2019 タイトル: Structural Basis of Dot1L Stimulation by Histone H2B Lysine 120 Ubiquitination. 著者: Marco Igor Valencia-Sánchez / Pablo De Ioannes / Miao Wang / Nikita Vasilyev / Ruoyu Chen / Evgeny Nudler / Jean-Paul Armache / Karim-Jean Armache / 要旨: The essential histone H3 lysine 79 methyltransferase Dot1L regulates transcription and genomic stability and is deregulated in leukemia. The activity of Dot1L is stimulated by mono-ubiquitination of ...The essential histone H3 lysine 79 methyltransferase Dot1L regulates transcription and genomic stability and is deregulated in leukemia. The activity of Dot1L is stimulated by mono-ubiquitination of histone H2B on lysine 120 (H2BK120Ub); however, the detailed mechanism is not understood. We report cryo-EM structures of human Dot1L bound to (1) H2BK120Ub and (2) unmodified nucleosome substrates at 3.5 Å and 4.9 Å, respectively. Comparison of both structures, complemented with biochemical experiments, provides critical insights into the mechanism of Dot1L stimulation by H2BK120Ub. Both structures show Dot1L binding to the same extended surface of the histone octamer. In yeast, this surface is used by silencing proteins involved in heterochromatin formation, explaining the mechanism of their competition with Dot1. These results provide a strong foundation for understanding conserved crosstalk between histone modifications found at actively transcribed genes and offer a general model of how ubiquitin might regulate the activity of chromatin enzymes.
ダウンロード / ファイル: emd_0654.map.gz / 形式: CCP4 / 大きさ: 64 MB / タイプ: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
注釈
Result of cisTEM refinement, filtered to 5.2A, not sharpened. This map is in the same environment as the model constructed. It is shifted and resampled to fit with the environment of the paper
凍結剤: ETHANE / チャンバー内湿度: 100 % / チャンバー内温度: 295.15 K / 装置: FEI VITROBOT MARK I 詳細: 3 ul of Dot1L-nucleosome complexes were applied to a glow discharged Quantifoil holey carbon grid (1.2 um hole size, 200 mesh), blotted in a Vitrobot Mark III (FEI Company) using 1.5 seconds ...詳細: 3 ul of Dot1L-nucleosome complexes were applied to a glow discharged Quantifoil holey carbon grid (1.2 um hole size, 200 mesh), blotted in a Vitrobot Mark III (FEI Company) using 1.5 seconds blotting at 100% humidity, and then plunge-frozen in liquid ethane cooled by liquid nitrogen..