...
首页> 外文期刊>Cellular Signalling >Protein phosphatase 1 inhibits p53 signaling by dephosphorylating and stabilizing Mdmx
【24h】

Protein phosphatase 1 inhibits p53 signaling by dephosphorylating and stabilizing Mdmx

机译:蛋白磷酸酶1通过去磷酸化和稳定Mdmx抑制p53信号传导

获取原文
获取原文并翻译 | 示例
           

摘要

The activation and stabilization of the p53 protein play a major role in the DNA damage response. Protein levels of p53 are tightly controlled by transcriptional regulation and a number of positive and negative posttranslational modifiers, including kinases, phosphatases, E3 ubiquitin ligases, deubiquitinases, acetylases and deacetylases. One of the primary p53 regulators is Mdmx. Despite its RING domain and structural similarity with Mdm2, Mdmx does not have an intrinsic ligase activity, but inhibits the transcriptional activity of p53. Previous studies reported that Mdmx is phosphorylated and destabilized in response to DNA damage stress. Three phosphorylation sites identified are Ser342, Ser367, and Ser403. In the present study, we identify protein phosphatase 1 (PP1) as a negative regulator in the p53 signaling pathway. PP1 directly interacts with Mdmx and specifically dephosphorylates Mdmx at Ser367. The dephosphorylation of Mdmx increases its stability and thereby inhibits p53 activity. Our results suggest that PP1 is a crucial component in the ATM-Chk2-p53 signaling pathway.
机译:p53蛋白的激活和稳定在DNA损伤反应中起主要作用。 p53的蛋白质水平受转录调控以及许多正负翻译后修饰因子(包括激酶,磷酸酶,E3泛素连接酶,去泛素酶,乙酰酶和脱乙酰酶)的严格控制。 Mdmx是主要的p53调节器之一。尽管其RING域和与Mdm2的结构相似,Mdmx并不具有固有的连接酶活性,但可以抑制p53的转录活性。先前的研究报告称,Mdmx在响应DNA损伤应激时被磷酸化并不稳定。鉴定出的三个磷酸化位点是Ser342,Ser367和Ser403。在本研究中,我们确定蛋白磷酸酶1(PP1)作为p53信号通路中的负调节剂。 PP1直接与Mdmx相互作用,并在Ser367上特异性地使Mdmx脱磷酸。 Mdmx的去磷酸化增加其稳定性,从而抑制p53活性。我们的结果表明PP1是ATM-Chk2-p53信号通路中的关键组成部分。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号