コヘシンのDNAの出口ゲートは入口ゲートと異なるもので,アセチル化によって調節される
Kok-Lung Chan1, Maurici B Roig, Bin Hu
1University of Oxford, Department of Biochemistry, South Parks Road, Oxford OX1 3QU, UK.
Cell
|August 21, 2012
まとめ
姉妹染色体の結束は,コヘシン複合体に依存しています. Waplサブユニット活動に影響する突然変異はコヘシン回転を減少させ,染色体解離の解放機構を明らかにし,DNA複製と細胞分裂に影響を与えます.
科学分野:
- 細胞生物学 細胞生物学
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
背景:
- 姉妹染色体凝結は,細胞分裂中の正確な染色体分離に不可欠です.
- Smc1,Smc3,α-kleisinを含むコヘシン複合体は,コヘションを確立し,維持する.
- Eco1はSmc3をアセチレートし,Waplの阻害作用に対抗し,これは結束の確立に不可欠である.
研究 の 目的:
- Waplサブユニットの活動がコヘシンの売上高とコヘシンの確立における役割を調査する.
- コヘシンがクロマチンから解離するメカニズムを解明する.
- コヘシンリング開きとSmc3アセチル化の機能的影響を調査する.
主な方法:
- Waplの反体制活動を無効にするためのサイト指向型変異.
- 周心クロマチンのコヘシン回転の分析.
- Smc3の核酸結合ドメインをα-kleisinのN-末端ドメインと融合させ,タンパク質工学を行う.
主要な成果:
- Waplの反確立活性を減少させる変異は,周心クロマチンのコヘシン回転を減少させた.
- Waplに関連したコヘシン複合体に固有の新しい"放出"活動が特定され,染色体からの解離を促進しました.
- 融合コンストラクタはコヘシンターボレットを削減し,Eco1の不在でWapl独立のコヘションの確立を可能にしました.
結論:
- コヘシン解離は,Smc3/α-kleisinインターフェースを開き,DNAの出口ゲートを作成する"放出"活動を伴う.
- Smc3のアセチル化は,α-クレインからの解離を防止し,結合性を安定させる可能性がある.
- コヘシン環の規制された開きは,染色体結合と分離を制御する重要なメカニズムです.
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