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In Vitro Analysis of E3 Ubiquitin Ligase Function
Published on: May 14, 2021
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COP9シグナルソームによるCullin-RINGユビキチンE3リガゼの調節
Simone Cavadini1,2, Eric S Fischer1,2,3,4, Richard D Bunker1,2
1Friedrich Miescher Institute for Biomedical Research, Maulbeerstrasse 66, 4058 Basel, Switzerland.
Nature
|April 1, 2016
まとめ
COP9シグナルソーム複合体 (CSN) は,CRL4A ((DDB2) のようなクリンリングリガゼ (CRLs) を誘導適合メカニズムで活性化させ,DNA修復のためのCRLファミリー全体で保存された規制原理を明らかにする.
科学分野:
- 分子生物学
- 構造生物学
- 生物化学
背景:
- クリン-RINGユビキチンE3リガゼ (CRL) 家族には200人以上のヒトメンバーがいます.
- COP9シグナルソーム複合体 (CSN) は,NEDD8を取り除き,CRLを調節する.
- CRL4A ((DDB2) は,紫外線によるDNA損傷の監視と修復に不可欠です.
研究 の 目的:
- CRL4A(DDB2) に CSN 結合の構造的基礎を明らかにする.
- 濃縮されたCRLによるCSN活性化の原理を理解する.
- CSNによるCRL4A ((DDB2) の規制メカニズムを調査する.
主な方法:
- 凍結電子顕微鏡 (cryo-EM) を用いて,ネディレートされたCRL4Aリガゼに結合したCSNの構造を決定した.
- 新しいアポ-CSN結晶構造が得られた.
- 結合界面と形状の変化を理解するために構造分析が行われました.
主要な成果:
- Cryo-EM構造は,6. 4 Åの解像度で,ネディレートされたCRL4AリガゼとコンプレックスでCSNを明らかにした.
- 誘発的フィットメカニズムは,ネディレートされたCRLによるCSN活性化を説明する.
- CSNと基板結合はCRL4Aの相互排斥であり,基板フリー複合体の不活性状態を好みます.
結論:
- ネディレートされたCRLによるCSNの活性化は,誘発的フィットメカニズムに従います.
- CSNによるCRL4A(DDB2) 規制は,CSNと基板の相互排他的結合を伴う.
- これらの規制原則は,CRLファミリー全体で維持され,グローバルな規制を可能にします.
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