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Updated: Mar 3, 2026
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Cdc48 ATPase複合体による基板処理の分子機構
Nicholas O Bodnar1, Tom A Rapoport1
1Howard Hughes Medical Institute and Department of Cell Biology, Harvard Medical School, 240 Longwood Avenue, Boston, MA 02115, USA.
Cell
|May 6, 2017
まとめ
Ufd1/Npl4 (UN) 共同因子を持つCdc48 ATPase複合体は,ポリウビキチン化タンパク質を展開し抽出する. ATPの水解が基質の転位と放出を促し,デウビキチナスの協力が必要です.
科学分野:
- タンパク質の生化学
- 分子細胞生物学
- 酵素学
背景:
- Cdc48 ATPaseとUfd1/Npl4 (UN) は,細胞構造からポリユビキチン化タンパク質を抽出するために不可欠です.
- Cdc48複合体による基板処理の正確なメカニズムは,ほとんど定義されていないままでした.
研究 の 目的:
- Cdc48-UN複合体がポリユビキチン化タンパク質基質を処理する段階的なメカニズムを解明する.
- 基板の展開と放出におけるD1とD2 ATPase リングの異なる役割を理解する.
主な方法:
- 精製されたCdc48,Ufd1/Npl4 (UN) コファクター,およびポリウビキチン化タンパク質基板を用いた生化学的測定.
- ATPの水解に依存する基板転位とCdc48のダブルリング構造の展開の分析.
主要な成果:
- D2リングのATP水解は,中央の毛穴を通して基質ポリペプチドの転位を誘導し,展開を誘導する.
- D1リングのATP水解は,複合体からの基質の後の放出に不可欠です.
- サブストラット放出は,転位のためのポリウビキチン鎖を切断するためにデウビキチナゼとの協力を必要とします.
結論:
- Cdc48媒介によるタンパク質抽出のための新しいモデルが提案されており,それは,異なるリングで連続したATP水解を伴うものである.
- この発見は,Cdc48,その共因子,およびデウビキチナゼのタンパク質処理および分解経路における協調作用を強調しています.
- このメカニズムは,Cdc48とその哺乳類の同類であるp97/VCPの機能に関する洞察を提供します.
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