Palmdelphin, a novel target of p53 with Ser46 phosphorylation, controls cell death in response to DNA damage.

Palmdelphin, a novel target of p53 with Ser46 phosphorylation, controls cell death in response to DNA damage.
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DOI:
10.1038/cddis.2014.176
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发表时间:
2014-05-08
影响因子:
9
通讯作者:
--
中科院分区:
生物学1区
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--
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肿瘤抑制基因p53调节细胞凋亡对DNA损伤的反应。p53的启动子选择性主要取决于其磷酸化。特别地,p53的丝氨酸-46处的磷酸化在促进促凋亡基因中是必不可少的,然而,促凋亡基因的确定性很差。在目前的研究中,我们确定palmdelphin作为一个促凋亡基因诱导的p53在磷酸化丝氨酸-46特异性的方式。在野生型p53转染的细胞中观察到棕榈海豚蛋白的上调,但在丝氨酸-46突变的细胞中未观察到。p53诱导palmdelphin的表达以响应DNA损伤。反过来,棕榈海豚素诱导细胞凋亡。有趣的是,棕榈海豚蛋白的下调通过ATP耗竭导致坏死性凋亡样细胞死亡。DNA损伤后,棕榈啡肽主要聚集在细胞核中,诱导细胞凋亡。这些发现将棕榈海豚蛋白定义为丝氨酸-46-磷酸化p53的靶点,其控制响应于DNA损伤的细胞死亡。
The tumor suppressor gene p53 regulates apoptosis in response to DNA damage. Promoter selectivity of p53 depends on mainly its phosphorylation. Particularly, the phosphorylation at serine-46 of p53 is indispensable in promoting pro-apoptotic genes that are, however, poorly determined. In the current study, we identified palmdelphin as a pro-apoptotic gene induced by p53 in a phosphorylated serine-46-specific manner. Upregulation of palmdelphin was observed in wild-type p53-transfected cells, but not in serine-46-mutated cells. Expression of palmdelphin was induced by p53 in response to DNA damage. In turn, palmdelphin induced apoptosis. Intriguingly, downregulation of palmdelphin resulted in necroptosis-like cell death via ATP depletion. Upon DNA damage, palmdelphin dominantly accumulated in the nucleus to induce apoptosis. These findings define palmdelphin as a target of serine-46-phosphorylated p53 that controls cell death in response to DNA damage.
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