非编码RNARsmZ作为蛋白质海绵的结构基础
Olivier Duss1, Erich Michel1, Maxim Yulikov2
1Institute of Molecular Biology and Biophysics, ETH Zürich, CH-8093 Zürich, Switzerland.
Nature
|May 16, 2014
概括
像RsmZ这样的非编码RNA充当蛋白质海绵,隔离调节性蛋白质以控制细菌毒性. 这项研究揭示了由 Pseudomonas fluorescens 中的 RsmE 蛋白质二元体对这种封存的分子机制.
科学领域:
- 细菌监管网络是一种细菌监管网络.
- 转录后的基因调节.
- RNA与蛋白质的相互作用
背景情况:
- Csr/Rsm系统是一个全球的转录后调节器,控制细菌毒性.
- 像CsrB和RsmZ这样的非编码RNA (ncRNA) 将CsrA型蛋白质隔离起来,以激活翻译启动.
- 通过ncRNA介导的蛋白质结合的分子机制仍然不太清楚.
研究的目的:
- 阐明细菌Csr/Rsm系统中ncRNAs对蛋白质分离的分子机制.
- 为了确定ncRNA-RsmE复合物的结构.
- 了解ncRNA结合是如何防止降解的.
主要方法:
- 核磁共振 (NMR) 光谱学 核磁共振 (NMR) 光谱学
- 电子偏磁共振 (EPR) 光谱学
- 对RNA-蛋白相互作用的生物物理特征.
主要成果:
- 在RsmZ ncRNA上,RsmE蛋白质二元组合顺序,特异性和合作性.
- 在溶液中阐明了两个截然不同的70千多达尔顿的核糖蛋白结构.
- 结合RsmE可以保护RsmZ免受RNaseE降解.
结论:
- 作为一种理想的蛋白质"海绵",RsmZ有效地隔离,储存和释放RsmE.
- 这些发现揭示了细菌中ncRNA介导的蛋白质结合的分子基础.
- 这种机制对于调节细菌毒性和其他细胞过程至关重要.
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