Endonuclease G promotes autophagy by suppressing mTOR signaling and activating the DNA damage response.

Endonuclease G promotes autophagy by suppressing mTOR signaling and activating the DNA damage response.
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核酸内切酶 G 通过抑制 mTOR 信号传导和激活 DNA 损伤反应来促进自噬

DOI:
10.1038/s41467-020-20780-2
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发表时间:
2021-01-20
影响因子:
16.6
通讯作者:
Zhou Q
Zhou Q
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Wang W;Li J;Tan J;Wang M;Yang J;Zhang ZM;Li C;Basnakian AG;Tang HW;Perrimon N;Zhou Q

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核酸内切酶G(ENDOG)是一种线粒体核酸酶,已知参与许多细胞过程,包括凋亡和父系线粒体消除,但其在自噬中的作用尚不清楚。在这里,我们报告说,从线粒体释放ENDOG促进自噬在饥饿期间,我们发现这是进化保守的跨物种进行实验,在人类细胞系,小鼠,果蝇和C。优美的在饥饿条件下,糖原合成酶激酶3 β介导的在Thr-128和Ser-288处的ENDOG磷酸化增强了其与14-3-3γ的相互作用,这导致从14-3-3γ释放出胰蛋白酶(TSC 2)和磷脂酰肌醇3-激酶催化亚基3型(Vps 34),随后是mTOR途径抑制和自噬启动。或者,ENDOG激活DNA损伤反应并通过其核酸内切酶活性触发自噬。我们的研究结果表明,ENDOG是自噬的重要调节因子,表现为磷酸化介导的与14-3-3γ的相互作用及其内切酶活性介导的DNA损伤反应。
Endonuclease G (ENDOG), a mitochondrial nuclease, is known to participate in many cellular processes, including apoptosis and paternal mitochondrial elimination, while its role in autophagy remains unclear. Here, we report that ENDOG released from mitochondria promotes autophagy during starvation, which we find to be evolutionally conserved across species by performing experiments in human cell lines, mice,DrosophilaandC. elegans. Under starvation, Glycogen synthase kinase 3 beta-mediated phosphorylation of ENDOG at Thr-128 and Ser-288 enhances its interaction with 14-3-3γ, which leads to the release of Tuberin (TSC2) and Phosphatidylinositol 3-kinase catalytic subunit type 3 (Vps34) from 14-3-3γ, followed by mTOR pathway suppression and autophagy initiation. Alternatively, ENDOG activates DNA damage response and triggers autophagy through its endonuclease activity. Our results demonstrate that ENDOG is a crucial regulator of autophagy, manifested by phosphorylation-mediated interaction with 14-3-3γ, and its endonuclease activity-mediated DNA damage response.
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发表时间: 2010-05
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