ヒストンオクトーマー核の歪みは,クロマチンリモデラーによる核細胞動員を促進する
Kalyan K Sinha1, John D Gross2, Geeta J Narlikar3
1Department of Biochemistry and Biophysics, University of California San Francisco, San Francisco, CA 94158, USA.
まとめ
SNF2hのようなクロマチンの改造剤はヒストンのオクターマーを歪めてDNAを移動させ,核細胞の可塑性を明らかにする. オクタマー変形はDNAの動員に重要な役割を果たし,リモデラーのタイプによって様々な役割があります.
科学分野:
- 生物化学
- 分子生物学
- 構造生物学
背景:
- アデノシン5'-トリフォスファート (ATP) に依存するクロマチンの改造剤は,生物学的プロセスに不可欠な核細胞DNAを動員する.
- ヒストンオクタマーのステリック障害を克服するDNAが動員されるメカニズムは完全に理解されていません.
研究 の 目的:
- クロマチンリモデレータSNF2hによって誘発されるヒストンオクタマーの構造的およびダイナミックな変化を調査する.
- 異なるATP依存リモデレータによるニュクレオソームのスライディングと退去におけるヒストンオクタマー歪みの役割を明らかにする.
主な方法:
- メチル横断リラクゼーション最適化核磁気共振 (NMR) スペクトロスコピーは,大きな (450キロダルトン) コンプレックスで採用されました.
- オクタマー歪みを防ぐために,サイト固有の二硫化物結合が導入されました.
主要な成果:
- 活性化されたATP状態でのSNF2h結合はヒストンのオクターマーを歪め,埋もれたヒストンの残基の動態を変更することが示された.
- ディスルファイド結合によるオクトーマー歪曲の抑制は,SNF2h媒介のヌクレオソームスライディングを阻害した.
- SWI-SNF複合体とRSCによって,同じ歪みを防止する改変がオクタマーの退去を促進した.
結論:
- 核細胞のヒストン核は,これまで考えられていたより高い可塑性を示している.
- オクタマー変形は,特定のクロマチンのリモデラーによって異なるニュクレオソームのスライディングと退去に異なる役割を果たします.
- ヒストンオクタマー可塑性は,ATPに依存する改造メカニズムを超えて,より広範なクロマチンの調節における重要な要因である可能性があります.
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