組み込みのルールを備えた分子機械のRNAスキャン
Hye Ran Koh1, Mary Anne Kidwell, Jennifer Doudna
1Department of Biophysics, Johns Hopkins University , Baltimore, Maryland 21218, United States.
Journal of the American Chemical Society
|December 14, 2016
まとめ
トランザクティベーションレスポンスのRNA結合タンパク質 (TRBP) は,協調されたサブドメインの動きによってdsRNAに拡散する. 柔軟なリンクは拡散距離を指示し,RNA基板をスキャンするためのルールのようなメカニズムを明らかにします.
科学分野:
- 分子生物学
- 生物化学
- RNA 生物学
背景:
- DNAとRNAのモータータンパク質を リアルタイムで追跡できます
- 二重鎖RNA (dsRNA) に関するトランスアクティベーションレスポンスのRNA結合タンパク質 (TRBP) のATP依存の拡散メカニズムは以前報告されていたが,メカニズムは不明であった.
研究 の 目的:
- dsRNAのTRBP拡散のメカニズム的な詳細を解明する.
- TRBPサブドメインとリンク器領域の移動と基質認識における役割を調査する.
主な方法:
- 単一分子光測定法を使用して,dsRNAのTRBP運動を追跡した.
- TRBPのdsRNA結合ドメイン (dsRBD1とdsRBD2) を接続する柔軟なリンクドメインの長さを操作した.
主要な成果:
- TRBPの拡散は,2つのdsRNA結合サブドメイン (dsRBD1とdsRBD2) の独立した動きによって調整される.
- 拡散距離は柔軟なリンク器の長さに正比例し,リールのような機能を示唆しています.
- TRBPの拡散はRNA:DNAハイブリッドや二次構造のような物理的な障壁で停止し,スキャンメカニズムを示しています.
結論:
- TRBPは,調整されたサブドメインの動きとdsRNAスキャンのためのルールのようなリンク器を含むユニークな拡散メカニズムを使用しています.
- このメカニズムは,RNAi経路のためのpre- miRNAとpre- siRNA基板の識別と結合におけるTRBPの役割にとって極めて重要です.
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