FAM/USP9xは,TGFβシグナル伝達に不可欠なデウビキチン化酵素であり,Smad4のモノビキチン化を制御しています
Sirio Dupont1, Anant Mamidi, Michelangelo Cordenonsi
1Department of Histology, Microbiology, and Medical Biotechnologies, University of Padua School of Medicine, viale Colombo 3, 35131 Padua, Italy.
Cell
|January 13, 2009
まとめ
デウビキチナゼFAM (USP9x) は,Smad4モノビキチネーションを逆転させ,細胞応答の調節における重要なステップであるTGF-βシグナル伝達に不可欠である.
科学分野:
- 細胞の信号伝達経路は,
- 分子生物学は分子生物学である.
- ウビキチネーションとデウビキチネーション
背景:
- Smad複合体の組み立ては,TGFβシグナル伝達に不可欠です.
- 核スマド複合体の活動を制御するメカニズムは不明である.
研究 の 目的:
- Smad複合体の機能の新たな調節体を特定する.
- TGFβ信号制御におけるユビキチネーションの役割を明らかにする.
主な方法:
- 重要なタンパク質を特定するためのsiRNAスクリーニング.
- Smad4.4のインビボユビキチナーション分析
- タンパク質とタンパク質の相互作用を調査する.
主要な成果:
- FAM (USP9x) は,TGFbetaおよびBMPシグナル伝達に不可欠な保存デウビキチナゼとして特定されました.
- Smad4はライシン519でモノウビキチン化され,その機能を阻害する.
- FAMは,Smad4のモノウビキチン化に対抗し,Smad4の活動を回復させます.
- エクトドーミン/Tif1gamma (Ecto) はSmad4モヌビキチンリガゼとして機能する.
結論:
- Smad4のモノウビキチネーション/デウビキチネーションは,TGFβの反応性を調節する.
- FAMのデウビキチナゼ活動は,Smad4の機能に極めて重要です.
- このユビキチネーションベースの調節は,R-Smadのリン酸化に並行しています.
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