クリン-RINGリンガゼのNEDD8活性化に関する構造的洞察:結合の構成制御
David M Duda1, Laura A Borg, Daniel C Scott
1Howard Hughes Medical Institute, St Jude Children's Research Hospital, Memphis, TN 38105, USA.
Cell
|September 23, 2008
まとめ
Cullin-RINGリガゼ (CRLs) の活動は,NEDD8の修正によって制御されています. この構造の変化は,不活性な形態を不利にし,ポリユビキチン化を促進し,CRLの機能を強化します.
科学分野:
- バイオケミストリー バイオケミストリー
- 構造生物学 構造生物学とは
- 分子生物学は分子生物学である.
背景:
- クリン・リング・リガゼ (Cullin-RING ligases,CRLs) は,ユビキチンE3酵素の主要なクラスである.
- CRLのNEDD8修正により,それらのユビキチン化活性が活性化し,CAND1結合が抑制されます.
研究 の 目的:
- NEDD8の修正によりCRLの構造と構成の変化を調査する.
- これらの変化がCRLの活性と阻害剤結合にどのように影響するかを理解する.
主な方法:
- NEDD8改変Cul5 (((ctd) -Rbx1.1.ctd) のX線結晶学により検出されました.
- NEDD8改変Cul1 (((ctd) -Rbx1.1) の小角X線散射 (SAXS) について
- ユビキチネーション活動を評価するための生化学的測定法.
主要な成果:
- NEDD8の修正は,CRLにおける重要な構成的再編成を引き起こします.
- cullin WHB および Rbx1 RING サブドメインは,CAND1 結合サイトを排除して,方向転換します.
- 構造的可塑性は,NEDD8酸化と,その後のユビキチナーションの両方にとって極めて重要です.
結論:
- NEDD8の結合により,CRLは非活動的,閉じた形状から動的,開かれた形状に変化します.
- NEDD8によるこの構成制御は,ポリユビキチン化を促進し,CRLの活動を強化します.
- この発見は,CRLの機能におけるコンフォーメーションレギュレーションのメカニズムを明らかにしています.
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