RNF8は,ヒストンの汎用化とチェックポイントタンパク質アセンブリによるDNA損傷信号を伝達する
Michael S Y Huen1, Robert Grant, Isaac Manke
1Department of Therapeutic Radiology, Yale University School of Medicine, New Haven, CT 06520, USA.
Cell
|November 16, 2007
まとめ
RNF8は,早期のDNA損傷反応に不可欠であり,チェックポイントタンパク質の蓄積とDNA修復に役立ちます. RNF8が欠けている細胞は,細胞サイクルチェックポイントの障害を示し,DNA損傷に対する感受性が高まります.
科学分野:
- 分子生物学は分子生物学である.
- 細胞生物学 細胞生物学
- バイオケミストリー バイオケミストリー
背景:
- DNAダメージ応答 (DDR) は,翻訳後の修正を含みます.
- 細胞循環のチェックポイント,DNA修復,衰老,アポトーシスは,DDRによって調節されます.
研究 の 目的:
- 早期のDNA損傷反応におけるRNF8の役割を調査する.
- RNF8がDDRで機能する分子メカニズムを解明する.
主な方法:
- RNF8.8のFHAドメインの構造を決定するためのX線結晶学.
- RNF8の減少がDNA損傷応答経路に与える影響を評価するための細胞アッセイ.
- タンパク質とタンパク質の相互作用とユビキティレーションイベントの分析.
主要な成果:
- RNF8は,BRCA1と53BP1を損傷した染色素に誘導することを促進する.
- RNF8は,そのFHAドメインを通じて,フォスフォ依存的な方法でMDC1と結合する.
- RNF8は,H2AXとDNA損傷部位の他の基質をユビキチナートする.
- RNF8が枯渇した細胞は,G2/Mチェックポイントが欠陥があり,電離放射線 (IR) に対する感受性が高まっている.
結論:
- RNF8は,DNA損傷に反応する新しいタンパク質です.
- RNF8は,DDR.でフォスフォリレーションとユビキキティレーションのシグナリングを統合する.
- RNF8は,遺伝子毒性ストレスに対する細胞の反応において重要な役割を果たします.
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