熱性アーカイバクテリアの分子チャペロンは,真核タンパク質t複合ポリペプチド-1と関係しています
J D Trent1, E Nimmesgern, J S Wall
1Howard Hughes Medical Institute, Yale School of Medicine, New Haven, Connecticut 06510.
Nature
|December 12, 1991
まとめ
アーカイバクテリアの熱ショックタンパク質である熱愛因子55 (TF55) は,分子チャペロンとして作用する. 進化的にはエウカリオットタンパク質のt複合ポリペプチド-1 (TCP1) と関係しており,新しいチャペロン類を示唆している.
科学分野:
- 分子生物学は分子生物学である.
- 進化生物学の進化生物学について
- バイオケミストリー バイオケミストリー
背景:
- 証拠は,アーカイバクテリアの成分と真核細胞細胞の間の進化的リンクを示唆しています.
- 熱ショックタンパク質は,しばしば分子チャペロンとして機能し,タンパク質の折り畳みと安定性を助けます.
研究 の 目的:
- 熱愛性アーカイバクテリアのSulfolobus shibatae (スルフォロボス・シバテ) の主要な熱ショックタンパク質 (TF55) の機能と進化的関係を調査する.
- TF55が分子チャペロンであり,真核のチャペロン成分に関連しているかどうかを判断する.
主な方法:
- TF55の構造とオリゴーマー状態の特徴.
- TF55の展開されたポリペプチドを結合する能力を in vitroで評価する.
- TF55のATPアゼ活性を分析した.
- TF55の主要な構造を,既知のシャペロンと真核タンパク質と比較した.
主要な成果:
- TF55は,チャペロニン環構造に似たホモオリゴメリック複合体です.
- TF55は,展開されたポリペプチドと結合し,ATPase活性を持つことを含む分子チャペロン活性を示しています.
- TF55の主な構造は,既知のチャペロニンとは関係ありませんが,真核タンパク質TCP1と高い同質性を示しています.
- TCP1は,Saccharomyces cerevisiaeに不可欠であり,ミトスのスパインドル形成に関与しています.
結論:
- TF55は,熱性アーカイバクテリアの分子チャペロンとして機能します.
- TF55とeukaryoticのTCP1は,古代の進化的関係を示す,新種の分子チャペロンのクラスを表しています.
- この発見は,生命のさまざまな領域におけるチャパロン多様性と進化についての理解を広げています.
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