Spatial control of the TSC complex integrates insulin and nutrient regulation of mTORC1 at the lysosome

Suchithra Menon, Christian C. Dibble, George Talbott, Gerta Hoxhaj, Alexander J. Valvezan, Hidenori Takahashi, Lewis C. Cantley, Brendan D. Manning

Research output: Contribution to journalArticlepeer-review

419 Scopus citations

Abstract

mTORC1 promotes cell growth in response to nutrients and growth factors. Insulin activates mTORC1 through the PI3K-Akt pathway, which inhibits the TSC1-TSC2-TBC1D7 complex (the TSC complex) to turn on Rheb, an essential activator of mTORC1. However, the mechanistic basis of how this pathway integrates with nutrient-sensing pathways is unknown. We demonstrate that insulin stimulates acute dissociation of the TSC complex from the lysosomal surface, where subpopulations of Rheb and mTORC1 reside. The TSC complex associates with the lysosome in a Rheb-dependent manner, and its dissociation in response to insulin requires Akt-mediated TSC2 phosphorylation. Loss of the PTEN tumor suppressor results in constitutive activation of mTORC1 through the Akt-dependent dissociation of the TSC complex from the lysosome. These findings provide a unifying mechanism by which independent pathways affecting the spatial recruitment of mTORC1 and the TSC complex to Rheb at the lysosomal surface serve to integrate diverse growth signals.

Original languageEnglish (US)
Pages (from-to)771-785
Number of pages15
JournalCell
Volume156
Issue number4
DOIs
StatePublished - Feb 13 2014
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)

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