PRMT5 is required for cell-cycle progression and p53 tumor suppressor function.

PRMT5 is required for cell-cycle progression and p53 tumor suppressor function.
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DOI:
10.1093/nar/gkp516
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发表时间:
2009-08
影响因子:
14.9
通讯作者:
Chen X
Chen X
中科院分区:
生物学2区
文献类型:
--
作者:
Scoumanne A;Zhang J;Chen X

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蛋白精氨酸甲基转移酶(PRMTs)介导蛋白质中甲基向精氨酸的转移,参与信号转导、转录调控和RNA加工。肿瘤抑制因子p53协调关键的细胞过程,包括细胞周期阻滞和DNA修复,以响应应激信号。翻译后修饰和与辅助因子的相互作用对调节p53的转录活性很重要。为了探索PRMTs是否调节p53功能,我们生成了多个PRMT1、CARM1和PRMT5被诱导下调的细胞系。在这里,我们发现PRMT5,而不是PRMT1或CARM1,是细胞增殖所必需的,PRMT5缺乏会在G1期触发细胞周期阻滞。此外,p53的表达需要PRMT5,在DNA损伤时,p53的靶点MDM2和p21也会被诱导。重要的是,我们确定PRMT5敲低可以阻止p53蛋白的合成。此外,我们发现PRMT5调节翻译起始因子eIF4E的表达,PRMT5敲低介导的生长抑制不依赖于p53而依赖于eIF4E。综上所述,我们发现精氨酸甲基转移酶PRMT5是调节eIF4E表达和p53翻译的主要促生存因子。
Protein arginine methyltransferases (PRMTs) mediate the transfer of methyl groups to arginines in proteins involved in signal transduction, transcriptional regulation and RNA processing. Tumor suppressor p53 coordinates crucial cellular processes, including cell-cycle arrest and DNA repair, in response to stress signals. Post-translational modifications and interactions with co-factors are important to regulate p53 transcriptional activity. To explore whether PRMTs modulate p53 function, we generated multiple cell lines in which PRMT1, CARM1 and PRMT5 are inducibly knocked down. Here, we showed that PRMT5, but not PRMT1 or CARM1, is essential for cell proliferation and PRMT5 deficiency triggers cell-cycle arrest in G1. In addition, PRMT5 is required for p53 expression and induction of p53 targets MDM2 and p21 upon DNA damage. Importantly, we established that PRMT5 knockdown prevents p53 protein synthesis. Furthermore, we found that PRMT5 regulates the expression of translation initiation factor eIF4E and growth suppression mediated upon PRMT5 knockdown is independent of p53 but is dependent on eIF4E. Taken together, we uncovered that arginine methyltransferase PRMT5 is a major pro-survival factor regulating eIF4E expression and p53 translation.
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