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RNAi Interference by dsRNA Injection into Drosophila Embryos
Published on: April 11, 2011
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ドロソフィラRNAi酵素複合体の組み立てにおける基本的なステップを定義する
Shintaro Iwasaki1, Hiroshi M Sasaki1, Yuriko Sakaguchi2
1Institute of Molecular and Cellular Biosciences, The University of Tokyo, Bunkyo-ku, Tokyo 113-0032, Japan.
Nature
|March 31, 2015
まとめ
チャペロンタンパク質は,siRNA複合体とArgonaute 2 (Ago2) の間の相互作用を安定させ,RNA誘発サイレンシング複合体 (RISC) の組み立てを促進します. このプロセスは,小さな干渉RNAs (siRNAs) によって媒介される遺伝子サイレンシングに不可欠です.
科学分野:
- 分子生物学は分子生物学である.
- RNA干渉 (RNAi) とは
- タンパク質生化学 タンパク質生化学
背景:
- siRNAsやmiRNAsを含む小型RNAは,アルゴナウト (Ago) タンパク質を補完的なメッセンジャーRNAに誘導することによって遺伝子発現を調節する.
- RNA誘発サイレンシング複合体 (RISC) は,RNAサイレンシングに不可欠なエフェクタ複合体であり,その核はアゴタンパク質である.
- Drosophila Ago2にsiRNAが負荷される正確なメカニズムは,Dicer-2,R2D2,およびシャパロン機構を含むが,まだ完全に理解されていない.
研究 の 目的:
- RNA誘発サイレンシング複合体 (RISC) の組み立てを制御する分子メカニズムを解明する.
- 小型の干渉RNA (siRNA) デュプレックスがArgonaute 2 (Ago2) に負荷される際のHsc70/Hsp90チャペロン機構の役割を調査する.
主な方法:
- 精製されたコンポーネント: Ago2, Dicer-2, R2D2, Hsc70, Hsp90, Hop, Droj2, and p23.3 を使用して,RISCアセンブリをインビトロで再構成する.
- RISCの組み立て中間材料の動態を追跡するための単一分子観察.
- チャペロン機構の存在または欠如において,Dicer-2-R2D2-siRNA複合体とAgo2の相互作用をモニタリングするためのアッセイ.
主要な成果:
- チャペロンが存在しない場合,siRNAに結合したDicer-2-R2D2とAgo2の関連性は一時的なものです.
- Hsc70/Hsp90チャペロン機構は,Ago2.2上のDicer-2-R2D2-siRNA複合体の停留時間を大幅に延長しています.
- このチャペロン媒介の安定化は,siRNAガイドストランドの5'-リン酸群の認識に依存しています.
結論:
- Hsc70/Hsp90チャペロンメカニズムは,Ago2.2への効率的なsiRNAデュプレックスロードを容易にする上で重要な役割を果たしています.
- チャペロンは,Dicer-2-R2D2複合体からの生産的なsiRNA負荷に有利な形状でAgo2を維持します.
- この研究は,RNA干渉に不可欠なRISCアセンブリのチャペロン支援メカニズムに関する重要な洞察を提供します.
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