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植物ウイルスの"再起動"因子は,宿主トランスレーション機構と相互作用する
H S Park1, A Himmelbach, K S Browning
1Friedrich Miescher-Institute, P.O. Box 2543, CH-4002, Basel, Switzerland.
Cell
|September 27, 2001
まとめ
カリフラワーモザイクウイルストランザクティベーター (TAV) は,ポリシストロニックRNAの翻訳再起動を可能にします. TAVは,真核の始動因子eIF3とリボソームサブユニットと相互作用し,ウイルスのmRNAの翻訳を促進します.
科学分野:
- 分子生物学は分子生物学である.
- ウイルス学 ウイルス学 ウイルス学
- 植物科学 植物科学について
背景:
- 翻訳再起動は,ポリシストロニックmRNAsからの遺伝子発現に不可欠です.
- カリフラワーモザイクウイルストランザクティベーター (TAV) は,このプロセスを制御することが知られている.
- TAVのメカニズムを理解することは,ウイルスの遺伝子発現戦略を解読する鍵です.
研究 の 目的:
- TAVが翻訳再起動を促進する分子メカニズムを解明する.
- TAV媒介翻訳に関与する宿主因子を特定する.
- TAVとホスト翻訳機構の相互作用を特徴付ける.
主な方法:
- タンパク質の相互作用を研究するためのインビトロおよびインビボ生化学測定法.
- ポリソーム関連研究.
- 植物原生体における一時的な発現.
- 三次複合形成分析. 三次複合形成分析.
主要な成果:
- TAVはポリソームとeIF3.3のエウカリオット開始因子と関連しています.
- TAVはeIF3サブユニットeIF3gと60Sリボソームタンパク質L24と物理的に相互作用する.
- eIF3gとL24の発現は,TAV媒介による再起動に影響を与えます.
- TAV/eIF3/40SおよびeIF3/TAV/60S三元複合体の形成が実証されました.
結論:
- TAVはeIF3をポリソームに採用し,ポリシストロニックRNAの翻訳再起動を可能にします.
- このメカニズムは,ウイルスが細胞の翻訳障壁を克服することを可能にします.
- TAVは,効率的なウイルス遺伝子発現を達成するために宿主因子eIF3gとL24を使用します.
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