PP1/PNUTS酸酶结合了限制性复合体,并刺激了RNA Pol II转录终结
Benjamin Erickson1, Roman Fedoryshchak2, Nova Fong1
1Department of Biochemistry and Molecular Genetics, University of Colorado School of Medicine, PO Box 6511, Aurora, CO 80045, USA.
Cell reports
|April 17, 2025
概括
该ZC3H4/WDR82限制器综合体使用PP1/PNUTS酸酶活性来终止反感应转录. 这一过程涉及去酸化RNA聚合酶IICTD,促进转录终止.
科学领域:
- 分子生物学分子生物学
- 基因规则 基因规则
- 生物化学 生物化学
背景情况:
- ZC3H4/WDR82复合体作为转录终结器,但其机制尚不清楚.
- 了解转录终止对于调节基因表达至关重要.
研究的目的:
- 阐明ZC3H4/WDR82终止反意义转录的分子机制.
- 为了确定参与这个过程的蛋白质合作伙伴和酶活性.
主要方法:
- 免疫沉试验用于识别ZC3H4/WDR82相互作用蛋白.
- 预测AlphaFold蛋白质结构以建模复杂的形成.
- 使用野生型和突变型PP1/PNUTS复合物的酶分析.
- NET-seq分析以评估RNA聚合酶II活性和CTD酸化.
主要成果:
- ZC3H4/WDR82与蛋白质酸酶1 (PP1) 和其调节子单元PNUTS相互作用.
- 一个催化不活的PP1/PNUTS复合体抑制了ZC3H4/WDR82介导的终结,表明酸酶活性是必不可少的.
- PP1/PNUTS在Serine 5 (Ser5-P) 处去化RNA聚合酶II的C端域 (CTD). PP1/PNUTS在Serine 5 (Ser5-P) 处去化RNA聚合酶II的C端域.
- CTD Ser5脱酸化通过增加RNA聚合酶II暂停来促进转录终止.
结论:
- 通过WDR82招募的PP1/PNUTS酸酶是ZC3H4/WDR82转录终结机制的关键组成部分.
- 通过PP1/PNUTS对RNA Pol II CTD Ser5-P的脱化对于有效的反意义转录终止至关重要.
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