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ESCRT-IIIをAAA ATPase Vps4によって選択的に承認するための構造的基礎
Takayuki Obita1, Suraj Saksena, Sara Ghazi-Tabatabai
1MRC Laboratory of Molecular Biology, Medical Research Council Centre, Cambridge CB2 0QH, UK.
Nature
|October 12, 2007
まとめ
Vps4のようなAAA+アタパースは,細胞機能に不可欠です. 研究者らは,ESCRT-IIIのサブユニットVps2とDid2との特定のVps4MITドメインの相互作用が,エンドソームの分類に不可欠であり,古代の進化的起源を示唆することを発見しました.
科学分野:
- 細胞生物学 細胞生物学
- 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
背景:
- AAA+アタパースは,膜の輸送とタンパク質の処理を含む様々な細胞の役割を果たします.
- AAA ATPase Vps4は,細胞膜からESCRT複合体を分解することによって,リスソームへのエンドソーム分類,ウイルス芽生え,細胞分裂に不可欠です.
研究 の 目的:
- ESCRT-IIIサブユニットとのVps4相互作用の分子メカニズムを解明する.
- Vps4-ESCRT-IIIパートナーシップの進化的起源を調査する.
主な方法:
- Vps4 MITドメインの結晶構造をVps2 C端末と複合的に決定しました.
- ESCRT-IIIサブユニット内の相互作用モチーフ (D/E) xxxLxxRLxxL ((K/R)) を分析しました.
- 古代AAA ATPaseのN端領域の結晶構造を決定しました.
主要な成果:
- Vps2とDid2のみが,C端末30の残基を介してVps4 MITドメインに結合する.
- 結晶構造はVps4 MITヘリクスのalpha2とalpha3が特定の (D/E) xxxLxxRLxxL ((K/R)) モチーフを認識していることを明らかにしました.
- このモチーフの変異は,酵母分類の欠陥につながる.
- 古代AAA ATPaseのN端ドメインは,構造的にはVps4 MITドメインに類似しており,ESCRT-IIIのようなタンパク質と相互作用します.
結論:
- Vps4-ESCRT-IIIの相互作用は保存モチーフによって媒介され,選択的認識を説明します.
- Vps4/ESCRT-IIIのパートナーシップは,おそらく真核生物と古代生物の分岐に先行しており,古代の保存された機能を示しています.
- この相互作用は,内膜系が進化する前の原始的な機能の遺物であるかもしれない.
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