IWS1将下游DNA定位,以全球刺激Pol II延长
Aiturgan Zheenbekova1, James L Walshe1, Moritz Ochmann1
1Department of Molecular Biology, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany.
Nature communications
|August 20, 2025
概括
蛋白质IWS1 (与SPT6 1相互作用) 是RNA聚合酶II的关键延长因子,在全球范围内减少RNA合成和耗尽后的延长速度. 它还间接调节了组织素甲基化.
科学领域:
- 分子生物学分子生物学
- 基因表达 基因表达
- 生物化学 生化学
背景情况:
- 已知蛋白质IWS1 (与SPT6 1相互作用) 参与转录,但其在RNA聚合酶II (Pol II) 功能中的确切作用尚不清楚.
- 了解IWS1的功能是解读基因转录和相关表观遗传修饰的调节的关键.
研究的目的:
- 阐明IWS1在RNA聚合酶II功能中的直接作用及其对全球转录的影响.
- 确定IWS1与Pol II延伸复合体相互作用的结构基础.
- 为了研究IWS1枯竭对基因组修饰的下游影响.
主要方法:
- 在人类细胞中IWS1迅速耗尽后,采用了多omics动态分析.
- 使用冷电子显微镜 (cryo-EM) 用IWS1和ELOF1.1来解析Pol II延长复合物的结构.
- 进行了体外生化测试,以评估IWS1及其C端区域的功能影响.
主要成果:
- IWS1的耗尽导致RNA合成的全球减少,并降低了Pol II的延长速度.
- 冷-EM结构揭示了IWS1作为支架,将下游DNA定位在Pol II裂内.
- 在ELOF1的协助下,发现IWS1的C终端区域刺激了Pol II活动.
- IWS1的耗尽间接导致了在lysine-36 (H3K36me3) 处的希斯H3三甲基化下降.
结论:
- IWS1被确立为与Pol II相关的延长因子,可在全球范围内刺激Pol II的延长速度.
- IWS1作为支架的结构性作用对于其在促进DNA通过Pol II裂的功能至关重要.
- 这项研究强调了IWS1在通过其对转录的影响来确保适当的协同转录组织素甲基化中的间接但至关重要的作用.
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