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, University of Wisconsin-Madison, Madison, WI 53706, United States.
Genetics
|October 23, 2025
概括
酵母蛋白Hrp1作为一个RNA聚合酶II抗终结因子. 在RNAP II和Hrp1中的基因突变揭示了Hrp1如何促进转录延长并防止过早终止.
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 生物化学
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,但其特征仍然很差.
- 酵母核RNA结合蛋白Hrp1 (也称为Nab4和CF1B) 被研究为一种潜在的RNAP II抗终结因子.
研究的目的:
- 提供Hrp1作为RNAP II抗终结因子的遗传证据.
- 阐明Hrp1与RNAP II相互作用并影响转录终止的机制.
主要方法:
- 使用酵母菌株在RNAP II (Rpb3-K9E) 和Hrp1.1中具有特定突变的基因分析.
- 全基因组抑制屏幕识别突变,拯救与Rpb3-K9E相关的表型.
- 纳米孔直接RNA测序 (直接RNA-seq) 来分析内源终端子的透读.
主要成果:
- 在RNAP II (Rpb3-K9E) 中的一种特定突变导致了Nrd1-Nab3-Sen1-依赖 (NNS) 终端的读透和对寒冷敏感的生长.
- 通过Hrp1的突变实现了Rpb3-K9E表型的抑制,特别是其RNA识别动机 (RRMs) 的突变.
- 直接RNA-seq证实了RPb3-K9E突变体内源性NNS终端子的阅读度增加以及Hrp1突变的抑制.
结论:
- Hrp1作为RNAP II抗终结因子,促进转录延长.
- 当RNAP II发生突变 (Rpb3-K9E) 时,Hrp1可能会与RNAP II延长复合体结合,并且在终端处不那么容易释放.
- 抑制Rpb3-K9E的Hrp1突变可能会削弱其与RNAP II的相互作用,恢复适当的终结调节.
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