通过3'-RNA处理因子识别RNA聚合酶II碳酸终端域
Anton Meinhart1, Patrick Cramer
1Department of Chemistry and Biochemistry, Gene Center, University of Munich, 81377 Munich, Germany.
Nature
|July 9, 2004
概括
RNA聚合酶II的碳氧终端域 (CTD) 经历酸化,使其能够与RNA处理的Pcf11等蛋白相互作用. 这项研究揭示了这种相互作用的结构基础,为CTD动态提出了β螺旋模型.
科学领域:
- 分子生物学分子生物学
- 结构生物学 结构生物学
- 生物化学 生物化学
背景情况:
- RNA聚合酶II (Pol II) 转录了真核生物信使RNA,与RNA处理相结合.
- 在Pol II的碳氧终端域 (CTD) 中,Tyr1-Ser2-Pro3-Thr4-Ser5-Pro6-Ser7.7的重复组成.
- 化CTD与Pcf11和Nrd1等蛋白质中的CTD相互作用域 (CID) 结合,这对3'-RNA处理至关重要.
研究的目的:
- 为了确定与Pcf11 CID域结合的酸化CTD的结构.
- 阐明控制CTD-Pcf11结合的分子相互作用.
- 为转录和RNA处理过程中CTD动态提出模型.
主要方法:
- 进行X射线晶体学以确定Ser2-化CTD-Pcf11 CID复合物的结构.
- 结构分析以确定关键的绑定接口和相互作用.
- 计算建模提出一个CTD结构模型.
主要成果:
- 酸盐二化CTD基因 (Ser2-Pro3-Thr4-Ser5) 形成了一个β转结构.
- 这种β转向与Pcf11 CID域内的保存槽结合.
- 酸通过额外的键间接稳定β转,而不是与CID直接接触.
结论:
- 为CTD提出了一个β螺旋结构模型,该模型基于代的体结构.
- 该模型表明,在mRNA处理过程中,CTD的紧螺旋区域以酸化依赖的方式解开和再生.
- 这些发现提供了对转录合RNA处理的动态调节的见解.
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