期刊
AUTOPHAGY
卷 7, 期 6, 页码 645-646出版社
LANDES BIOSCIENCE
DOI: 10.4161/auto.7.6.15123
关键词
autophagy; ULK1; AMPK; mTOR; 14-3-3
类别
资金
- NCI NIH HHS [R01 CA108941] Funding Source: Medline
The serine/threonine kinase ULK1 is a mammalian homolog of Atg1, part of the Atg1 kinase complex, which is the most upstream component of the core autophagy machinery conserved from yeast to mammals. In budding yeast, activity of the Atg1 kinase complex is inhibited by TORC1 (target of rapamycin complex 1), but how the counterpart ULK1 complex in mammalian cells is regulated has been unknown. Our laboratories recently discovered that AMPK associates with, and directly phosphorylates, ULK1 on several sites and this modification is required for ULK1 activation after glucose deprivation. In contrast, when nutrients are plentiful, the mTORC1 complex phosphorylates ULK1, preventing its association and activation by AMPK. These studies have revealed a molecular mechanism of ULK1 regulation by nutrient signals via the actions of AMPK and mTORC1.
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