具有内置规则的分子机器的RNA扫描
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
概括
交互活化反应RNA结合蛋白 (TRBP) 通过协调的子域运动扩散在dsRNA上. 一个灵活的链接器决定了扩散距离,揭示了扫描RNA基质的规律式机制.
科学领域:
- 分子生物学
- 生物化学
- 核糖核酸生物学
背景情况:
- 先进的单分子技术可以实时跟踪DNA和RNA运动蛋白.
- 在双链RNA (dsRNA) 上的转活反应RNA结合蛋白 (TRBP) 的ATP独立扩散机制之前已报告,但其机制尚不清楚.
研究的目的:
- 阐明dRNA上的TRBP扩散的机制细节.
- 调查TRBP子域和链接区域在其移动和基质识别中的作用.
主要方法:
- 使用单分子光测试来追踪dRNA上的TRBP运动.
- 操纵了连接TRBP的dsRNA结合域 (dsRBD1和dsRBD2) 的灵活链接域的长度.
主要成果:
- TRBP扩散是由其两个dsRNA结合子域 (dsRBD1和dsRBD2) 的独立运动协调的.
- 扩散距离与柔性链接器的长度成正比,这表明它具有类似规则的功能.
- 在RNA:DNA杂交或二次结构等物理障碍处停止TRBP扩散,表明扫描机制.
结论:
- TRBP采用一种独特的扩散机制,涉及协调的子域移动和dSRNA扫描的规则式链接器.
- 这种机制对于TRBP在RNAi路径中识别和结合前miRNA和前siRNA基质的作用至关重要.
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