Phosphorylation of Puma modulates its apoptotic function by regulating protein stability.

Phosphorylation of Puma modulates its apoptotic function by regulating protein stability.
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DOI:
10.1038/cddis.2010.38
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发表时间:
2010-07-29
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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Puma 是一种有效的 BH3 蛋白,可拮抗抗凋亡 Bcl-2 蛋白,促进 Bax/Bak 激活,并在多种凋亡模型中发挥重要作用。 Puma 表达通常保持非常低,但可以被多种转录因子诱导,包括 p53、p73、E2F1 和 FOXO3a,从而诱导细胞凋亡反应。由于 Puma 可以结合 Bcl-2 家族的所有抗凋亡成员并使其失活,因此必须严格控制其活性。我们在此首次报告 Puma 通过磷酸化受到翻译后控制的证据。我们发现 Puma 在多个位点被磷酸化,其中主要的磷酸化位点是丝氨酸 10。用丙氨酸替换丝氨酸 10 会导致 Puma 更新减少并增加细胞死亡。有趣的是,Puma 更新是通过蛋白酶体发生的,丝氨酸 10 的取代会导致 Puma 水平升高,而与巨自噬、Bcl-2 家族成员结合、半胱天冬酶活性和细胞凋亡无关。因此,我们得出结论,Puma 在丝氨酸 10 处的磷酸化可促进 Puma 周转、抑制 Puma 的细胞死亡潜力并促进细胞存活。由于 Puma 具有高度促凋亡的性质,这些研究强调了决定细胞生命或死亡的一个重要的额外调节步骤。
Puma is a potent BH3-only protein that antagonises anti-apoptotic Bcl-2 proteins, promotes Bax/Bak activation and has an essential role in multiple apoptotic models. Puma expression is normally kept very low, but can be induced by several transcription factors including p53, p73, E2F1 and FOXO3a, whereby it can induce an apoptotic response. As Puma can to bind and inactivate all anti-apoptotic members of the Bcl-2 family, its activity must be tightly controlled. We report here, for the first time, evidence that Puma is subject to post-translational control through phosphorylation. We show that Puma is phosphorylated at multiple sites, with the major site of phosphorylation being serine 10. Replacing serine 10 with alanine causes reduced Puma turnover and enhanced cell death. Interestingly, Puma turnover occurs through the proteasome, and substitution of serine 10 causes elevated Puma levels independently of macroautophagy, Bcl-2 family member binding, caspase activity and apoptotic death. We conclude, therefore, that phosphorylation of Puma at serine 10 promotes Puma turnover, represses Puma's cell death potential and promotes cell survival. Owing to the highly pro-apoptotic nature of Puma, these studies highlight an important additional regulatory step in the determination of cellular life or death.
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