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CRL4DDB2/CSAユビキチンリガゼの構造,ターゲティング,および活性化の分子基礎
Eric S Fischer1, Andrea Scrima, Kerstin Böhm
1Friedrich Miescher Institute for Biomedical Research, Maulbeerstrasse 66, CH-4058 Basel, Switzerland.
Cell
|November 29, 2011
まとめ
CRL4 (((DDB2) リガゼはDDB2経由で紫外線で損傷したDNAを認識するが,COP9シグナルゾーム (CSN) によって抑制される. DDB2へのDNA結合は,この抑制を解放し,CRL4リガース活性化の一般的なメカニズムを明らかにします.
科学分野:
- 分子生物学は分子生物学である.
- 構造生物学 構造生物学とは
- バイオケミストリー バイオケミストリー
背景:
- DDB1-CUL4-RBX1 (CRL4) ユビキチンリガゼファミリーは,専用基板受容体 (DCAF) を通して細胞機能を制御する.
- DDB2 DCAFタンパク質は,DNA修復に不可欠なUV誘発ピリミジンジマーを特定しています.
- CRL4とDDB2の調節を理解することは,DNA損傷に対する細胞の反応の鍵です.
研究 の 目的:
- クロマチンにおけるサイクロブータンピリミジン二重体のDDB2媒介による認識の分子メカニズムを解明する.
- COP9シグナルソーム (CSN) によるCRL4(DDB2) リガース調節の構造的基礎を決定する.
- CRL4リガース活性化のための一般的なモデルを提案する.
主な方法:
- CRL4 ((DDB2) とCRL4 ((DCAF ((WD40)) 複合体のX線結晶学.
- リガゼ阻害剤との相互作用の構造分析.
- 酵素の活性と調節を研究するための生化学的分析.
主要な成果:
- CRL4 (DDB2) の構造は,移動性リガースアームを明らかにし,DNA損傷の周囲に特定のユビキチネーションゾーンを作成します.
- COP9シグナルソーム (CSN) は,CSN5から独立した方法で,CRL4を非酵素的に抑制します.
- DDB2に結合するDNA損傷は,CSN媒介の抑制を緩和し,リガスを活性化します.
- CRL4 ((DCAF ((WD40)) 複合施設は,保存された建築的特徴を共有しています.
結論:
- CRL4 (((DDB2) アクティベーションは,DNAの損傷によって直接媒介されるのではなく,CSNの移位によって媒介されます.
- DCAFへの基質結合は,CSNシフトとCRL4リガース活性化の一般的なトリガーです.
- この研究は,CRL4リガゼファミリーのメンバーの規制を理解するための枠組みを提供します.
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