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Purification of Hsp104, a Protein Disaggregase
Published on: September 30, 2011
プリオンタンパク質の改造により,直接的な現象型スイッチがもたらされます
Prasanna Satpute-Krishnan1, Tricia R Serio
1Department of Molecular Biology, Cell Biology and Biochemistry, Brown University, Providence, Rhode Island 02912, USA.
Nature
|September 9, 2005
まとめ
プリオン,または非典型のタンパク質は,機能状態を切り替えることができます. この研究は,成熟したプリオンタンパク質,Sup35が新しい状態にアクセスでき,急速な細胞現象型変化を引き起こすことを示しています.
科学分野:
- 分子生物学は分子生物学である.
- タンパク質生化学 タンパク質生化学
- イースト遺伝学 イースト遺伝学
背景:
- プリオンと呼ばれるタンパク質は,in vivoで複数の機能状態を採用し,遺伝などのプロセスに影響を与えることができます.
- 新しく合成されたプリオンタンパク質は,通常,既存の細胞構造を採用し,フェノタイプの伝播を確実にします.
- フェノタイプスイッチングを制御するメカニズムと,これらの移行中の既存のタンパク質の運命は不明のままです.
研究 の 目的:
- 酵母プリオンSup35/[PSI(+) ]におけるフェノタイプのスイッチングを誘発するタンパク質状態の変化を調査する.
- プリオン形成は,タンパク質合成中に特定の誤折り経路を必要とし,または成熟したタンパク質で発生できるかどうかを判断するために.
主な方法:
- 酵母Sup35/[PSI(+) ]のタンパク質状態変異の分析.
- プリオン誘発の現象型変化における成熟タンパク質再構成の役割を調査する.
主要な成果:
- Sup35のプリオン形式は,合成中に de novo 誤折り経路を必要としません.
- 成熟したSup35タンパク質は,再構成によってプリオン状態にアクセスできます.
- この移行は,Sup35の活性が失われ,細胞現象型が急速に変化することにつながります.
結論:
- 酵母プリオンにおけるフェノタイプのスイッチングは,成熟したタンパク質の形状の変化によって開始されることがあります.
- 既存のSup35タンパク質の改造は,1つの細胞サイクル内で急速な現象型変化を誘発する.
- この発見は,プリオン生物学とタンパク質ベースの遺伝機構に関する新しい洞察を提供します.
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