Cited by 631Autophagy in Disease and TherapyPI3K/AKT/mTOR signaling in cancerMetabolism, Diabetes, and Cancer

The autophagy initiating kinase ULK1 is regulated via opposing phosphorylation by AMPK and mTOR

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Egan, Dan, Kim, Joungmok, Shaw, Reuben J., Guan, Kun-Liang·2011·Autophagy

Abstract

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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  • AMPK is involved in the suppression of mTOR signaling.

    “Endurance training has been shown to inhibit mTOR/p70 S6K signaling and reduce IRS1 serine phosphorylation in rat skeletal muscle [157], and recent studies have demonstrated that AMPK is involved in the suppression of mTOR signaling [39].”

    From AMPK and Exercise: Glucose Uptake and Insulin Sensitivity (2013) · cites this paper as [39]

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Authors
Egan, D., Kim, J., Shaw, R. J., & Guan, K.-L.
Affiliations
  • Salk Institute for Biological Studies (US)
  • University of California San Diego (US)
Corresponding author
  • Shaw, Reuben J.
  • Guan, Kun-Liang
Venue
Autophagy
Published
2011-06
Volume
7
Issue
6
Pages
643-644
ISSN
  • 1554-8627 (ISSN-L)
  • 1554-8635
OpenAlex
W2070871404
Cited by
627
References
2
Citations by year
2026: 20 · 2025: 28 · 2024: 51 · 2023: 33 · 2022: 53 · 2021: 61 · 2020: 57 · 2019: 54 · 2018: 49 · 2017: 56 · 2016: 41 · 2015: 34 · 2014: 42 · 2013: 19 · 2012: 25
FWCI
21.69
Type
journal article
Language
en
Open access
Locations
  • Autophagy (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Cancer Institute (R01CA108941)
Topics
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › PI3K/AKT/mTOR signaling in cancer
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
Keywords
ULK1, autophagy initiation, AMPK, mTORC1, protein phosphorylation, nutrient signaling, glucose deprivation, TOR signaling, kinase regulation
MeSH terms
Autophagy-Related Protein-1 Homolog, Mechanistic Target of Rapamycin Complex 1, Adenylate Kinase, Animals, Autophagy, Saccharomycetales, Glucose, Humans, Models, Biological, Phosphorylation, Proteins, Gene Expression Regulation, Fungal, Caenorhabditis elegans, Protein Serine-Threonine Kinases, Multiprotein Complexes, Intracellular Signaling Peptides and Proteins, Mice, TOR Serine-Threonine Kinases

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