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

The CASTOR Proteins Are Arginine Sensors for the mTORC1 Pathway

Open access
Chantranupong, Lynne, Scaria, Sonia M., Saxton, Robert A., Gygi, Melanie P., Shen, Kuang, Wyant, Gregory A., Wang, Tim, Harper, J. Wade +2 more·2016·Cell

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.

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1016/j.cell.2016.02.035

Cites

51 of 51 references verified0 citation errors · 0 not checkable

Statistics

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • WDR24 and SEH1L form a minimal complex sufficient for interaction with SESN2, and these GATOR2 components with the addition of MIOS are sufficient to bind CASTOR1.

    “WDR24 and SEH1L are known to form a minimal complex sufficient for interaction with SESN2 (Parmigiani et al., 2014), and these GATOR2 components, with the addition of MIOS, were also identified as sufficient to bind CASTOR1 (Chantranupong et al., 2016; Gai et al., 2016b).”

    From Signal integration in the (m)TORC1 growth pathway (2018) · cites this paper as Chantranupong et al., 2016

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Cites

Flagged first, then by citations

1 of the 52 references couldn’t be matched to a known paper.

Cited by

Sorted by citations

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 · 2014: 1
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
  • Health Sciences › Medicine › Epidemiology › 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

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review