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Horizontal Gel Electrophoresis for Enhanced Detection of Protein-RNA Complexes
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シスのみのGroEL三元複合体からネイティブと非ネイティブの両方のタンパク質の放出
S G Burston1, J S Weissman, G W Farr
1Department of Genetics and Howard Hughes Medical Institute, New Haven, Connecticut 06510, USA.
Nature
|September 5, 1996
まとめ
GroELチャペロニン系は,非本来のタンパク質を放出し,細胞の調節を可能にします. このタンパク質放出メカニズムは,細胞内のタンパク質の構成と寿命に影響を与えます.
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
- セルラー・チャペロン・システム
背景:
- 二重環のチャペロニンGroELとコチャペロニンGroESは,シス・テルナー複合体経由でタンパク質の折り畳みを促進する.
- ATPの水解により,これらの複合体は解離され,GroESが放出され,基板の放出が引き起こされます.
- 重要な質問は,ネイティブタンパク質とネイティブでないタンパク質の両方が放出されているかどうかです.
研究 の 目的:
- GroEL cis複合体から原生および非原生タンパク質の放出メカニズムを調査する.
- GroEL cis複合体から非原生タンパク質の形態が放出されているかどうかを判断する.
主な方法:
- "cis-only"混合リングのGroEL複合体を使用して,リフォールドイベントを1つのリングに隔離しました.
- ポリペプチド基板を結合させながら解放しないことにより,再折り畳みを消すため,変異したGroEL"トラップ"を使用した.
- Xenopusの卵細胞抽出物と無傷の卵細胞で再折り畳みと消火をテストしました.
主要な成果:
- シス・オンリー・グロエル・コンプレックスは,ロダネス・リフォールドを媒介した.
- ミュータントのGroELトラップは,非本来の形態がcis複合体から解放されていることを示し,リフォールドを消した.
- この消火効果は,細胞のない抽出物と,無傷の卵細胞の両方で観察されました.
結論:
- 非原生タンパク質の形態は,GroEL cis複合体から放出されます.
- 非原生タンパク質の放出により,細胞の構成要素間の動的分割が可能になります.
- この分割は,タンパク質の構成と細胞タンパク質の寿命に影響を与えます.
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