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p73α Regulation by Chk1 in Response to DNA Damage

机译:Chk1对DNA损伤的p73α调控

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The checkpoint kinase 1 (Chk1) is an essential component of the DNA damage checkpoint. Previous studies have demonstrated an indispensable role for the p53-related transcription factor p73α in DNA damage-induced apoptosis. Here, we provide evidence that p73α is a target of Chk1. We found that endogenous p73α is serine phosphorylated by endogenous Chk1 upon DNA damage, which is a mechanism required for the apoptotic-inducing function of p73α. Consistent with this, we discovered that endogenous p73α interacts with Chk1 and is phosphorylated by Chk1 at serine 47 in vitro and in vivo. In contrast, Chk2 does not phosphorylate p73α in vitro. Moreover, mutation of serine 47 abolishes both Chk1-dependent phosphorylation of p73α upon DNA damage in vivo and the ability of Chk1 to upregulate the transactivation capacity of p73α. Our data indicate a novel biochemical pathway through which the p73α proapoptotic function requires DNA damage-triggered p73α phosphorylation by Chk1.
机译:检查点激酶1(Chk1)是DNA损伤检查点的重要组成部分。先前的研究表明,p53相关转录因子p73α在DNA损伤诱导的细胞凋亡中起着不可或缺的作用。在这里,我们提供的证据表明p73α是Chk1的靶标。我们发现内源性p73α在DNA损伤时被内源性Chk1丝氨酸磷酸化,这是p73α诱导凋亡的功能所必需的机制。与此相一致,我们发现内源性p73α与Chk1相互作用,并在体外和体内被丝氨酸47上的Chk1磷酸化。相反,Chk2在体外不磷酸化p73α。此外,丝氨酸47的突变消除了体内DNA损伤后p73α的Chk1依赖性磷酸化,以及Chk1上调p73α的反式激活能力的能力。我们的数据表明p73α的凋亡功能需要通过Chk1引发DNA损伤的p73α磷酸化的新型生化途径。

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