PLK1通过Drosha酸化调节微RNA生物发生
Claire Emily Fletcher1, Molly Ann Taylor2, Charlotte Lynne Bevan1
1Department of Surgery & Cancer, Imperial College London, Hammersmith Hospital, Du Cane Road, London W12 0NN, UK.
International journal of molecular sciences
|September 28, 2023
概括
波罗样类激酶1 (PLK1) 酸化Drosha,调节微RNA (miR) 生物发生,独立于细胞周期进展. 这种酸化影响了Drosha-DGCR8复合物局部化和miR处理,为酶抑制剂反应提供了潜在的生物标志物.
科学领域:
- 分子生物学分子生物学
- 癌症生物学 癌症生物学
- 生物化学 生物化学
背景情况:
- 波罗样激酶1 (PLK1) 是细胞循环的关键调节剂,也是各种癌症的治疗点.
- 微处理器复合体的催化核心Drosha对于微RNA (miR) 生物生成至关重要.
- 众所周知,几种激酶可酸化miR生物发生机制组件,影响它们的活性和局部化.
研究的目的:
- 为了研究PLK1通过直接酸化Drosha来调节miR生物发生的假设.
- 阐明PLK1-介导的Drosha酸化对miR生物发生路径的功能后果.
- 确定由PLK1调节的特定miRs,并评估它们作为酶抑制剂反应生物标志物的潜力.
主要方法:
- 试验室内激酶试验证实了Drosha在特定的血清残留物 (S300/S302) 上的PLK1酸化.
- 西部涂抹和共同免疫沉以评估Drosha酸化,DGCR8关联和亚细胞局部化.
- 小RNA测序和qPCR用于识别PLK1-调节的miR,并分析前miR和前miR水平.
主要成果:
- PLK1直接在S300和/或S302对Drosha进行酸化,影响Drosha-DGCR8复合体的形成和亚细胞局部化.
- 抑制PLK1导致Drosha酸化的降低,Drosha:DGCR8局部的改变 (细胞质的增加,核的减少) 和miR生物发生的减少.
- 十个特定的miR被确定为通过PLK1抑制显著下调,调节发生在pri-miR到pre-miR处理阶段.
结论:
- 通过PLK1介导的Drosha酸化是miR生物发生的关键调节机制,独立于PLK1的细胞周期作用.
- 德罗莎S300和S302作为多个激酶信号的集成站点,影响不同miR子集的生物发生效率.
- 已确定的酶调节的miRs作为预测生物标志物具有前景,用于评估癌症和其他疾病中对酶抑制剂治疗的反应.
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