アナフェーズ促進複合体の分子構造とメカニズム
Lei-Fu Chang1,2, Ziguo Zhang1,2, Jing Yang1,2
1Division of Structural Biology, Institute of Cancer Research, 237 Fulham Road, London, SW3 6JB, UK.
Nature
|July 22, 2014
まとめ
アナフェーズ促進複合体/サイクロソーム (APC/C) は,ユビキチネーションを通じて細胞分裂を制御する. 研究者らは,その完全な構造を明らかにし,コアクティベーターが,そのE3リガース活性をどのように調節するかを明らかにした.
科学分野:
- 細胞生物学 細胞生物学
- 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:
- アナフェーズ促進複合体/サイクロソーム (APC/C) は,細胞サイクル進行を制御する重要なE3ユビキチンリガゼである.
- その活動はコアクティベーターサブユニットに依存しているが,その規制の構造的根拠は,未知のサブユニット組織のために,まだよく理解されていない.
研究 の 目的:
- 人間のAPC/C-コアクティベーター-基板複合体の完全な二次構造構造を決定する.
- コアクティベーターによるAPC/C調節の基礎となる分子メカニズムを解明する.
主な方法:
- クリオ電子顕微鏡 (cryo-EM) による人間のAPC/C-共活性化器-基板複合体の再構築,解像度7.4 Å.
主要な成果:
- 1.2 MDa アセンブリのすべての20のAPC/Cサブユニットの完全な二次構造アーキテクチャと決定的な位置を決定しました.
- 以前は特徴づけられなかったサブユニットのタンパク質の折りたたみが特定されました.
- コアクティベーター結合時に深いアロステリック移行が観察され,触媒サブユニットの移動と柔軟性の増加が伴う.
結論:
- コアクティベーター結合は,APC/Cの重要な構造変化を誘導し,そのE3リガース活性を増強する可能性があります.
- この構造的洞察は,APC/C調節とその細胞サイクル制御における役割を理解するための分子基盤を提供します.
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