A Tumor Suppressor Complex with GAP Activity for the Rag GTPases That Signal Amino Acid Sufficiency to mTORC1
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Sabatini_Tumor suppressor.pdf
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Author(s)
Bar-Peled, Liron
Chantranupong, Lynne
Cherniack, Andrew D.
Chen, Walter W.
Ottina, Kathleen
Grabiner, Brian C.
Spear, Eric D.
Carter, Scott L.
Meyerson, Matthew L.
Sabatini, David M.
Date Issued
May 2013
Journal
Science
Publisher
American Association for the Advancement of Science
Citation
Bar-Peled, L., L. Chantranupong, A. D. Cherniack, W. W. Chen, K. A. Ottina, B. C. Grabiner, E. D. Spear, S. L. Carter, M. Meyerson, and D. M. Sabatini. “A Tumor Suppressor Complex with GAP Activity for the Rag GTPases That Signal Amino Acid Sufficiency to mTORC1.” Science 340, no. 6136 (May 30, 2013): 1100-1106.
Version
Author's final manuscript
Abstract
The mTOR complex 1 (mTORC1) pathway promotes cell growth in response to many cues, including amino acids, which act through the Rag guanosine triphosphatases (GTPases) to promote mTORC1 translocation to the lysosomal surface, its site of activation. Although progress has been made in identifying positive regulators of the Rags, it is unknown if negative factors also exist. Here, we identify GATOR as a complex that interacts with the Rags and is composed of two subcomplexes we call GATOR1 and -2. Inhibition of GATOR1 subunits (DEPDC5, Nprl2, and Nprl3) makes mTORC1 signaling resistant to amino acid deprivation. In contrast, inhibition of GATOR2 subunits (Mios, WDR24, WDR59, Seh1L, and Sec13) suppresses mTORC1 signaling, and epistasis analysis shows that GATOR2 negatively regulates DEPDC5. GATOR1 has GTPase-activating protein (GAP) activity for RagA and RagB, and its components are mutated in human cancer. In cancer cells with inactivating mutations in GATOR1, mTORC1 is hyperactive and insensitive to amino acid starvation, and such cells are hypersensitive to rapamycin, an mTORC1 inhibitor. Thus, we identify a key negative regulator of the Rag GTPases and reveal that, like other mTORC1 regulators, Rag function can be deregulated in cancer.
Description
available in PMC 2013 July 31.
MIT Department
Massachusetts Institute of Technology. Department of Biology
Whitehead Institute for Biomedical Research
Koch Institute for Integrative Cancer Research at MIT
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1126/science.1232044
