Cited by 1,236PI3K/AKT/mTOR signaling in cancerMetabolism, Diabetes, and CancerProtein Kinase Regulation and GTPase Signaling

PRAS40 is an insulin-regulated inhibitor of the mTORC1 protein kinase

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Sancak, Yasemin, Thoreen, Carson C., Peterson, Timothy R., Lindquist, Robert A., Kang, Seong A., Spooner, Eric, Carr, Steven A., Sabatini, David M.·2007·Molecular Cell

Abstract

The heterotrimeric mTORC1 protein kinase nucleates a signaling network that promotes cell growth in response to insulin and becomes constitutively active in cells missing the TSC1 or TSC2 tumor suppressors. Insulin stimulates the phosphorylation of S6K1, an mTORC1 substrate, but it is not known how mTORC1 kinase activity is regulated. We identify PRAS40 as a raptor-interacting protein that binds to mTORC1 in insulin-deprived cells and whose in vitro interaction with mTORC1 is disrupted by high salt concentrations. PRAS40 inhibits cell growth, S6K1 phosphorylation, and rheb-induced activation of the mTORC1 pathway, and in vitro it prevents the great increase in mTORC1 kinase activity induced by rheb1-GTP. Insulin stimulates Akt/PKB-mediated phosphorylation of PRAS40, which prevents its inhibition of mTORC1 in cells and in vitro. We propose that the relative strengths of the rheb- and PRAS40-mediated inputs to mTORC1 set overall pathway activity and that insulin activates mTORC1 through the coordinated regulation of both.

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Crossref · 10.1016/j.molcel.2007.03.003

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Authors
Sancak, Y., Thoreen, C. C., Peterson, T. R., Lindquist, R. A., Kang, S. A., Spooner, E., Carr, S. A., & Sabatini, D. M.
Affiliations
  • Whitehead Institute for Biomedical Research (US)
  • Broad Institute (US)
Corresponding author
Sabatini, David M.
Venue
Molecular Cell
Publisher
Elsevier BV
Published
2007-03
Volume
25
Issue
6
Pages
903-915
ISSN
1097-2765 (ISSN-L)
OpenAlex
W2136676465
Cited by
1,236
References
38
Citations by year
2026: 24 · 2025: 30 · 2024: 35 · 2023: 37 · 2022: 61 · 2021: 68 · 2020: 77 · 2019: 56 · 2018: 71 · 2017: 78 · 2016: 71 · 2015: 78 · 2014: 81 · 2013: 77 · 2012: 84
FWCI
30.36
Type
journal article
Language
en
Open access
Locations
  • Molecular Cell (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • American Diabetes Association
  • W. M. Keck Foundation
  • Alexander and Margaret Stewart Trust
  • Rita Allen Foundation
  • Allen Foundation
  • National Institutes of Health
  • National Cancer Institute (R01CA103866, R01CA129105)
  • National Institute of Allergy and Infectious Diseases (R01 AI47389, R01AI047389)
Topics
  • 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
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
Keywords
PRAS40, mTORC1, insulin signaling, S6K1 phosphorylation, raptors, Rheb, Akt phosphorylation, cell growth regulation, kinase inhibition, salt sensitivity
MeSH terms
Mechanistic Target of Rapamycin Complex 1, Animals, Carrier Proteins, Cell Line, Enzyme Inhibitors, Humans, Insulin, Kinetics, Phosphoproteins, Phosphorylation, Proteins, Transcription Factors, Multiprotein Complexes, Protein Kinase Inhibitors, Adaptor Proteins, Signal Transducing, Mice, TOR Serine-Threonine Kinases

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