Phosphorylation of ULK1 (hATG1) by AMP-activated protein kinase connects energy sensing to mitophagy.

Phosphorylation of ULK1 (hATG1) by AMP-activated protein kinase connects energy sensing to mitophagy.
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AMP激活的蛋白激酶对ULK1(HATG1)的磷酸化将能量传感连接到线粒体。

DOI:
10.1126/science.1196371
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发表时间:
2011-01-28
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Shaw RJ
Shaw RJ
中科院分区:
其他
文献类型:
--
作者:
Egan DF;Shackelford DB;Mihaylova MM;Gelino S;Kohnz RA;Mair W;Vasquez DS;Joshi A;Gwinn DM;Taylor R;Asara JM;Fitzpatrick J;Dillin A;Viollet B;Kundu M;Hansen M;Shaw RJ

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腺苷一磷酸激活蛋白激酶(AMPK)是一种保守的细胞内能量传感器,在低营养供应和环境胁迫下被激活。在AMPK保守底物的筛选中,我们鉴定了ULK1和ULK2,它们是自噬所需的酵母蛋白激酶Atg1的哺乳动物直系同源物。哺乳动物肝脏和C. elegans揭示了自噬中对这些激酶的需求。在哺乳动物中,AMPK或ULK1的缺失导致自噬衔接子p62的异常积累和有缺陷的线粒体自噬。用不能被AMPK磷酸化的突变体ULK1重建ULK1缺陷细胞,揭示了这种磷酸化是线粒体稳态和饥饿后细胞存活所必需的。这些发现揭示了一个保守的生化机制耦合营养状态与自噬和细胞存活。
Adenosine monophosphate-activated protein kinase (AMPK) is a conserved sensor of intracellular energy activated in response to low nutrient availability and environmental stress. In a screen for conserved substrates of AMPK, we identified ULK1 and ULK2, mammalian orthologs of the yeast protein kinase Atg1, which is required for autophagy. Genetic analysis of AMPK or ULK1 in mammalian liver and C. elegans revealed a requirement for these kinases in autophagy. In mammals, loss of AMPK or ULK1 resulted in aberrant accumulation of the autophagy adaptor p62 and defective mitophagy. Reconstitution of ULK1-deficient cells with a mutant ULK1 that cannot be phosphorylated by AMPK revealed that such phosphorylation is required for mitochondrial homeostasis and cell survival following starvation. These findings uncover a conserved biochemical mechanism coupling nutrient status with autophagy and cell survival.
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