The rag GTPases bind raptor and mediate amino acid signaling to mTORC1

Yasemin Sancak, Timothy R. Peterson, Yoav D. Shaul, Robert A. Lindquist, Carson C. Thoreen, Liron Bar-Peled, David M. Sabatini

Research output: Contribution to journalArticlepeer-review

2119 Scopus citations


The multiprotein mTORC1 protein kinase complex is the central component of a pathway that promotes growth in response to insulin, energy levels, and amino acids and is deregulated in common cancers. We find that the Rag proteins - a family of four related small guanosine triphosphatases (GTPases) - interact with mTORC1 in an amino acid - sensitive manner and are necessary for the activation of the mTORC1 pathway by amino acids. A Rag mutant that is constitutively bound to guanosine triphosphate interacted strongly with mTORC1, and its expression within cells made the mTORC1 pathway resistant to amino acid deprivation. Conversely, expression of a guanosine diphosphate - bound Rag mutant prevented stimulation of mTORC1 by amino acids. The Rag proteins do not directly stimulate the kinase activity of mTORC1, but, like amino acids, promote the intracellular localization of mTOR to a compartment that also contains its activator Rheb.

Original languageAmerican English
Pages (from-to)1496-1501
Number of pages6
Issue number5882
StatePublished - 13 Jun 2008
Externally publishedYes


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