酸酶PP1通过促进RNA聚合酶II暂停释放来维持全球转录
Zhenning Wang1, Aixia Song1, Bolin Tao1
1Cancer Institute & Department of Radiation Oncology, Fudan University Shanghai Cancer Center, Institutes of Biomedical Sciences, State Key Laboratory of Genetic Engineering, Shanghai Key Laboratory of Medical Epigenetics, Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China.
Molecular cell
|November 27, 2024
概括
酸酶1核向子单元 (PNUTS) -PP1复合体通过促进RNA聚合酶II暂停释放来意外地维持基因激活. 破坏这个复合体严重损害了转录,揭示了PP1在全球基因表达中的新角色.
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:
- RNA聚合酶II的进展依赖于蛋白质激酶和酸酶.
- 酸酶PP2A和PP1传统上被视为聚合酶进展的抑制剂.
- 人们认为PP1抑制了暂停释放和延长,而PP2A抑制了暂停释放.
研究的目的:
- 为了研究酸酶1核向子单元 (PNUTS) -PP1复合体在人类细胞中的作用.
- 阐明PNUTS-PP1在RNA聚合酶II进展和基因表达中的作用.
主要方法:
- 研究了急性PNUTS-PP1干扰对基因转录的影响.
- 分析了聚合酶进展缺陷和基因下调.
- 确定了PNUTS-PP1的基板,包括7SK snRNP子单位MEPCE.
主要成果:
- PNUTS-PP1复合体的破坏导致了暂停聚合酶释放的严重缺陷.
- 全球转录激活受损,导致大多数转录基因的下调.
- 为了促进暂停释放,PNUTS-PP1将已知的暂停调节器MEPCE脱.
- PNUTS-PP1的功能与集成器-PP2A (INTAC) 相反.
结论:
- PNUTS-PP1复合体在维持全球转录激活方面发挥着至关重要的,意想不到的作用.
- 通过PNUTS,PP1积极促进RNA聚合酶II暂停释放,这与之前的假设相反.
- PP1和PP2A酸酶在调节转录暂停和全基因组基因表达方面表现出相反的作用.
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