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The CASTOR Proteins Are Arginine Sensors for the mTORC1 Pathway
Open accessAbstract
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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“The CASTOR proteins function similarly; when arginine levels are low, the CASTOR proteins bind to and inhibit GATOR2. When arginine levels are high, CASTOR proteins bind to arginine and release GATOR2, which allows the recruitment of mTORC1 to the lysosome170,171.”
From Targeting the biology of aging with mTOR inhibitors (2023) · cites this paper as [171]
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“The CASTOR proteins function similarly; when arginine levels are low, the CASTOR proteins bind to and inhibit GATOR2. When arginine levels are high, CASTOR proteins bind to arginine and release GATOR2, which allows the recruitment of mTORC1 to the lysosome170,171.”
From Targeting the biology of aging with mTOR inhibitors (2023) · cites this paper as [171]
Experimental — accuracy not yet measuredIn the citing paper
“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
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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.
- ORCID
- Venue
- Cell
- Publisher
- Elsevier BV
- Published
- 2016-03
- Volume
- 165
- Issue
- 1
- Pages
- 153-164
- ISSN
- 0092-8674 (ISSN-L)
- PMC
- PMC4808398
- 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
- bronze
- doi.org
- Licence
- 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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