alexa Rheb GTPase is a direct target of TSC2 GAP activity and regulates mTOR signaling.
Immunology

Immunology

Journal of Clinical & Cellular Immunology

Author(s): Inoki K, Li Y, Xu T, Guan KL

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Abstract Tuberous sclerosis complex (TSC) is a genetic disease caused by mutation in either TSC1 or TSC2. The TSC1 and TSC2 gene products form a functional complex and inhibit phosphorylation of S6K and 4EBP1. These functions of TSC1/TSC2 are likely mediated by mTOR. Here we report that TSC2 is a GTPase-activating protein (GAP) toward Rheb, a Ras family GTPase. Rheb stimulates phosphorylation of S6K and 4EBP1. This function of Rheb is blocked by rapamycin and dominant-negative mTOR. Rheb stimulates the phosphorylation of mTOR and plays an essential role in regulation of S6K and 4EBP1 in response to nutrients and cellular energy status. Our data demonstrate that Rheb acts downstream of TSC1/TSC2 and upstream of mTOR to regulate cell growth.
This article was published in Genes Dev and referenced in Journal of Clinical & Cellular Immunology

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