生产性和降解性共转录效应因子与核上限结合复合物的竞争性结合的结构基础
Etienne Dubiez1, Erika Pellegrini2, Maja Finderup Brask3
1European Molecular Biology Laboratory, 71 Avenue des Martyrs, CS 90181, 38042 Grenoble Cedex 9, France; Univ. Grenoble Alpes, CNRS, CEA, IBS, 38000 Grenoble, France.
Cell reports
|January 4, 2024
概括
核结合复合体 (CBC) 和ARS2通过与效应体竞争来调节RNA命运. 这项研究揭示了这些相互作用如何决定RNA是否被加工或降解.
科学领域:
- 分子生物学分子生物学
- 在RNA生物学,RNA生物学.
- 结构生物学 结构生物学
背景情况:
- 核结合复合体 (CBC) 对于新生的RNA聚合酶II (Pol II) 转录处理至关重要.
- CBC与ARS2和各种效应因子相互作用,影响RNA命运,决定生产性成熟或降解.
- 了解这些竞争性相互作用是解读RNA调节途径的关键.
研究的目的:
- 阐明CBC-ARS2复合体与效应器相互作用的结构机制.
- 确定这些相互作用如何决定生产性与退化性RNA命运.
- 确定CBC介导RNA调节中NCBP3,NELF-E,PHAX和ZC3H18等特定效应因子的作用.
主要方法:
- 利用AlphaFold预测来建模复杂的结构.
- 进行了结构和生化验证实验.
- 对核RNA降解的体内结合要求进行了研究.
主要成果:
- 证明了效应器与CBC和ARS2.2形成竞争的二元复合体.
- 表明ARS2招募了对CBC的效应体,但抑制了它们在三元复合体中的直接CBC结合.
- 证实ZC3H18对CBC和ARS2的结合对核RNA在体内降解至关重要.
结论:
- ARS2充当一个中央支架,调解与CBC结合的竞争效应因子.
- 效应器招募和移位的平衡决定了RNA命运 (生产性与退化性).
- PHAX招募可以取代ARS2和ZC3H18,促进生产性RNA处理而不是降解.
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