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Published on: April 10, 2012
GroEL媒介のタンパク質の折り畳みは,複数の回転の結合と非本来の形態の放出によって進行します
J S Weissman1, Y Kashi, W A Fenton
1Howard Hughes Medical Institute, Department of Genetics, Yale University School of Medicine, New Haven, Connecticut 06510.
Cell
|August 26, 1994
まとめ
チャペロニンであるGroELタンパク質は,ポリペプチドの折り畳みを支援する. タンパク質を繰り返し結合し,展開し,放出し,溶液の中で正しく折りたたむようにします.
科学分野:
- 分子生物学は分子生物学である.
- タンパク質の折りたたみ
- チャペロンタンパク質 (Chaperone Proteins) とは
背景:
- チャペロニンGroELは,細胞内のタンパク質の折り畳みに不可欠な,大きな二重環タンパク質複合体です.
- これは,多種多様なポリペプチドが正しい3次元構造を達成するのを支援します.
研究 の 目的:
- チャペロニン媒介による折り畳み中のポリペプチドの折り畳み経路を調査する.
- GroELがタンパク質の折り畳みを促進するメカニズムを理解するために.
主な方法:
- GroEL-GroES-ATPシステム内のポリペプチドの行動を研究しました.
- 基質の中間物質を捕まえるために,変異したGroEL形態を使用した.
- タンパク質の構成を評価するために,プロテオリシスとトリプトファン光を用いた.
主要な成果:
- ポリペプチドは,ATPとGroESを添加すると,GroELから非原生状態で急速に放出されます.
- 放出されたポリペプチドは,GroELによって折りたたまれ,または迅速に反発し,動的分割を示唆します.
- リバウンドポリペプチドは,同様の展開状態を維持し,結合と放出の繰り返しサイクルを示します.
結論:
- GroELは,集積傾向のある中間物質を繰り返し結合し,展開することで機能します.
- チャペロニンはポリペプチドを放出し,溶液で折り畳みを試みることができます.
- この結合,展開,放出のサイクルは,多様なタンパク質の正しい折り畳みを促進します.
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