通过PUS7对7SK的伪化调节了Pol II转录延长
Yutao Zhao1,2, Hui-Lung Sun1,2, Wenlong Li1,2
1Department of Chemistry, Department of Biochemistry and Molecular Biology, and Institute for Biophysical Dynamics, The University of Chicago, Chicago, IL, USA.
由PUS7对7SK小核RNA (snRNA) 的伪尤里丁 (Ψ) 修改调节了转录. 在7SK中 Ψ的损失增强了RNA聚合酶II的延长,并使结直肠癌细胞对5-FU敏感.
科学领域:
- 分子生物学分子生物学
- 在RNA生物学,RNA生物学.
- 癌症研究 癌症研究
背景情况:
- 伪乌里丁 (Ψ) 是一种普遍存在的RNA修饰,影响RNA代谢,拼接和翻译.
- Ψ在调节转录,特别是通过小核RNAs中的作用,仍未得到充分研究.
- 7SK小核RNA (snRNA) 是已知的RNA聚合酶II (Pol II) 促销者-近位暂停的调节者.
研究的目的:
- 调查伪尿素合成酶7 (PUS7) 在7SK snRNA伪尿基化中的作用.
- 阐明7SK伪化对转录调节的功能后果.
- 探索调节结直肠癌 (CRC) 中的7SK伪化疗法的治疗潜力.
主要方法:
- 研究了7SK snRNA的PUS7介导的伪尿基化.
- 评估了 PUS7 耗尽对 P-TEFb 复合物解离和 Pol II Ser2 酸化的影响.
- 使用dCas13b引导系统对7SK.的特定部位的伪尿基化进行了测试.
- 评估了改变7SK伪化对CRC细胞亡和5-FU敏感性的影响.
主要成果:
- PUS7调解了7SK snRNA的伪尿基化.
- PUS7的损失导致7SK的低伪尿化,导致P-TEFb与7SK的解离.
- 这种解离通过增加Ser2酸化来增强RNA Pol II转录延长.
- 在CRC细胞中调节7SK伪化会影响细胞亡和5-FU敏感性.
结论:
- 通过PUS7对7SK snRNA的伪化是一种用于转录延长的新型调节机制.
- 改变的7SK伪化会影响结直肠癌细胞的命运,促进细胞亡并使细胞对5-FU敏感.
- 针对7SK伪尿化,为结直肠癌提供了一个潜在的治疗策略.
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