Overexpression of SCYL1-BP1 stabilizes functional p53 by suppressing MDM2-mediated ubiquitination.

Overexpression of SCYL1-BP1 stabilizes functional p53 by suppressing MDM2-mediated ubiquitination.
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DOI:
10.1016/j.febslet.2010.09.019
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发表时间:
2010-10-22
期刊:
影响因子:
3.5
通讯作者:
Huo K
Huo K
中科院分区:
生物学3区
文献类型:
--
作者:
Yan J;Di Y;Shi H;Rao H;Huo K

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在此之前,我们将SCYL1-BP1定义为Pirh2的底物,与MDM2结合。在目前的研究中,我们发现SCYL1-BP1蛋白水平的增加导致了P53蛋白数量的平行变化,这是因为SCYL1-BP1抑制了MDM2介导的P53泛素化。SCYL1-BP1不能改变人乳头瘤病毒E6蛋白对P53的泛素化,表明这种作用是MDM2所特有的。细胞中SCYL1-BP1蛋白水平的升高导致p21和GADD45转录活性增强,细胞增殖率降低,细胞凋亡率增加,致瘤性受到抑制。因此,我们认为SCYL1-BP1是MDM2-P53反馈环的一种新的调节因子,可能是一种潜在的肿瘤抑制因子。
Previously, we defined SCYL1-BP1 to be a substrate of Pirh2 that binds to MDM2. In the current study, we found that an increase in SCYL1-BP1 protein levels caused a parallel change in the amount of p53 protein due to the inhibition by SCYL-BP1 of MDM2-mediated p53 ubiquitination. SCYL1-BP1 was not able to alter the ubiquitination of p53 by human papillomavirus protein E6, indicating that the effect was specific for MDM2. Increases in the level of SCYL1-BP1 protein in cells led to the greater transcriptional activation of p21 and gadd45, reduced rate of cellular proliferation, increased levels of apoptosis and inhibition of tumorigenicity. Thus, we propose that SCYL1-BP1 is a novel regulator of the MDM2-p53 feedback loop and that it may be a potential tumor suppressor.
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