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Interview: Protein Folding and Studies of Neurodegenerative Diseases
Published on: July 16, 2008
リボソームと複合したトリガーファクタは,新生タンパク質の分子のゆりかごを形成します
Lars Ferbitz1, Timm Maier, Holger Patzelt
1Institut für Molekularbiologie und Biophysik, Eidgenössische Technische Hochschule Hönggerberg (ETH Zürich), HPK Gebäude, CH-8093 Zürich, Switzerland.
Nature
|August 31, 2004
まとめ
タンパク質の折りたたみを支援するチャペロンであるEscherichia coliトリガーファクターには,ユニークな"クルーチングドラゴン"構造があります. この構造は,リボソームから発生する新生ポリペプチドを遮断し,共翻訳折り合いの際に結合とプロテアゼの分解を防止します.
科学分野:
- 分子生物学は分子生物学である.
- 構造生物学 構造生物学とは
- バイオケミストリー バイオケミストリー
背景:
- リボソームから発生する新生ポリペプチド鎖は,適切に折りたたむための支援を必要とします.
- リボソーム関連チャペロンは,共翻訳性タンパク質の折りたたみにおいて重要な役割を果たします.
- トリガーファクターは,このプロセスに関与する,よく特徴づけられたシェーパロンです.
研究 の 目的:
- Escherichia coli トリガーファクターの高解像度結晶構造を決定するために.
- トリガー因子のリボソーム結合ドメインの構造を,大型のリボソームサブユニットと複合的に解明する.
- トリガーファクターが共同翻訳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.
主な方法:
- トリガー因子の2.7 Åの解像度構造を取得するために,X線結晶学を用いた.
- トリガー因子リボソーム結合ドメインのHaloarcula marismortui大リボソームサブユニットとの共結晶化が行われました.
- トリガーファクターの構造分析とドメインマッピングが行われました.
主要な成果:
- 結晶構造は,トリガーファクターがユニークな"クルーチングドラゴン"の形状を採用していることを明らかにしています.
- 明確なドメイン (リボソーム結合尾,ペプチジルプロリルイソメラーゼヘッド,カルボキシ末端アーム) が特定されました.
- トリガーファクターの構造は,そのドメインをリボソームの出口トンネルの上に配置し,保護された折り畳み環境を作成します.
結論:
- トリガーファクターのユニークな構造は,新生ポリペプチドをシールドすることで,共同翻訳性タンパク質の折り畳みを促進します.
- このシールドは,プロテアゼと集積から保護します.
- この発見は,タンパク質の折りたたみにおけるリボソーム関連チャペロンの新たな作用機構を示唆している.
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