Protein phosphatase 1 inhibits p53 signaling by dephosphorylating and stabilizing Mdmx.

Protein phosphatase 1 inhibits p53 signaling by dephosphorylating and stabilizing Mdmx.
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蛋白磷酸酶 1 通过去磷酸化和稳定 Mdmx 来抑制 p53 信号传导。

DOI:
10.1016/j.cellsig.2012.12.014
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发表时间:
2013-04
影响因子:
4.8
通讯作者:
Lu X
Lu X
中科院分区:
生物学2区
文献类型:
--
作者:
Lu Z;Wan G;Guo H;Zhang X;Lu X

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p53蛋白的激活和稳定在DNA损伤反应中起主要作用。p53的蛋白水平受到转录调控和许多正性和负性翻译后修饰物的严格控制,包括激酶、磷酸酶、E3泛素连接酶、去泛素酶、乙酰化酶和去乙酰化酶。其中一个主要的p53调节剂是Mdmx。尽管其RING结构域和结构与Mdm 2相似,但Mdmx不具有内在连接酶活性,但抑制p53的转录活性。以前的研究报道,Mdmx是磷酸化和不稳定的DNA损伤应激反应。确定的三个磷酸化位点是Ser 342、Ser 367和Ser 403。在本研究中,我们确定蛋白磷酸酶1(PP 1)作为p53信号通路中的负调节剂。PP 1直接与Mdmx相互作用,并特异性地使Mdmx在Ser 367处去磷酸化。Mdmx的去磷酸化增加其稳定性,从而抑制p53活性。我们的研究结果表明,PP 1是ATM-Chk 2-p53信号通路中的一个重要组成部分。
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.
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