在RNA结合蛋白Hrp1中的替代物映射出与酵母RNA聚合酶II延伸复合物的潜在相互作用表面
Moyao Wang1, Payal Arora2, Craig D Kaplan2
1Department of Biomolecular Chemistry, University of Wisconsin School of Medicine and Public Health, Madison, WI.
bioRxiv : the preprint server for biology
|July 14, 2025
概括
酵母核RNA结合蛋白Hrp1作为RNA聚合酶II反终结因子起作用. 遗传证据表明Hrp1与RNAP II相互作用,防止转录期间过早终止.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 生物化学 生化学
背景情况:
- 对于真核RNA聚合酶II (RNAP II) 的抗终结因子对于基因表达至关重要,但其特征仍然不佳.
- 酵母核RNA结合蛋白Hrp1 (也称为Nab4和CF1B) 被研究其作为RNAP II抗终结因子的潜在作用.
研究的目的:
- 提供Hrp1作为RNAP II反终结因子的遗传证据.
- 研究转录终止期间Hrp1和RNAP II之间的相互作用.
主要方法:
- 利用了酵母遗传学,包括RNAP II (Rpb3-K9E) 和全基因组抑制幕的特定突变.
- 分析了Nrd1-Nab3-Sen1-依赖 (NNS) 终结体和对寒冷敏感的生长表型的阅读.
- 研究了HRP1中的突变,重点是RNA识别动机 (RRMs) 和C端区域.
主要成果:
- 在RNAP II (Rpb3-K9E) 中的一种特定突变导致了NNS终端子的读透和对寒冷敏感的生长,这表明与抗终结因子的相互作用发生了改变.
- 全基因组和向抑制器幕发现了HRP1中的突变,拯救了Rpb3-K9E表型.
- 发现Hrp1的RRMs和C端区域的突变抑制了RNAP II突变,表明它们在Hrp1-RNAP II相互作用中的作用.
结论:
- Hrp1充当核RNA结合蛋白,作为酵母中的RNAP II反终结因子.
- Hrp1可能与RNAP II延长复合体结合,促进转录延长并防止过早终止.
- 抑制RNAP II突变的Hrp1突变可能会削弱Hrp1与RNAP II的结合,从而弥补终端器上改变的RNAP II功能.
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