Cited by 856PI3K/AKT/mTOR signaling in cancerAutophagy in Disease and TherapyMetabolism, Diabetes, and Cancer

The DOI matches its Crossref record; 51 of the 52 references it cites were found in a registry or an index.

The CASTOR Proteins Are Arginine Sensors for the mTORC1 Pathway

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Abstract

Amino acids signal to the mTOR complex I (mTORC1) growth pathway through the Rag GTPases. Multiple distinct complexes regulate the Rags, including GATOR1, a GTPase activating protein (GAP), and GATOR2, a positive regulator of unknown molecular function. Arginine stimulation of cells activates mTORC1, but how it is sensed is not well understood. Recently, SLC38A9 was identified as a putative lysosomal arginine sensor required for arginine to activate mTORC1 but how arginine deprivation represses mTORC1 is unknown. Here, we show that CASTOR1, a previously uncharacterized protein, interacts with GATOR2 and is required for arginine deprivation to inhibit mTORC1. CASTOR1 homodimerizes and can also heterodimerize with the related protein, CASTOR2. Arginine disrupts the CASTOR1-GATOR2 complex by binding to CASTOR1 with a dissociation constant of ~30 μM, and its arginine-binding capacity is required for arginine to activate mTORC1 in cells. Collectively, these results establish CASTOR1 as an arginine sensor for the mTORC1 pathway.

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Crossref · 10.1016/j.cell.2016.02.035

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Metadata

Authors
Chantranupong, L., Scaria, S. M., Saxton, R. A., Gygi, M. P., Shen, K., Wyant, G. A., Wang, T., Harper, J. W., Gygi, S. P., & Sabatini, D. M.
Affiliations
  • Broad Institute (US)
  • Harvard University (US)
Corresponding author
Sabatini, David M.
Venue
Cell
Publisher
Elsevier BV
Published
2016-03
Volume
165
Issue
1
Pages
153-164
ISSN
0092-8674 (ISSN-L)
OpenAlex
W2293646973
Cited by
843
References
52
Citations by year
2026: 64 · 2025: 81 · 2024: 77 · 2023: 105 · 2022: 78 · 2021: 102 · 2020: 95 · 2019: 57 · 2018: 73 · 2017: 67 · 2016: 43
FWCI
41.91
Type
journal article
Language
en
Open access
Locations
  • Cell (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • DSpace@MIT (Massachusetts Institute of Technology) (submittedVersion, cc-by-nc-nd)
  • PMC
Funders
  • US NIH (R01CA103866, AI47389)
  • Department of Defense (W81XWH-07-0448)
  • John Reed UROP Fund
  • National Defense Science & Engineering Graduate Fellowship
  • NIH (F31 CA180271, F31 CA189437, U41 HG006673, GM095567)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › PI3K/AKT/mTOR signaling in cancer
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Autophagy in Disease and Therapy
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
Keywords
mTORC1, arginine sensing, arginine deprivation, GATOR2, GATOR1, Rag GTPases, amino acid signaling, arginine binding, protein complex dissociation, homodimerization, heterodimerization
MeSH terms
Mechanistic Target of Rapamycin Complex 1, Arginine, Carrier Proteins, Humans, Multiprotein Complexes, Intracellular Signaling Peptides and Proteins, Protein Multimerization, HEK293 Cells, TOR Serine-Threonine Kinases

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