RHEB cDNA Clone – Enriched in Brain (Human)

This gene is a member of the small GTPase superfamily and encodes a lipid-anchored, cell membrane protein with five repeats of the RAS-related GTP-binding region. This protein is vital in regulation of growth and cell cycle progression due to its role in the insulin/TOR/S6K signaling pathway. The protein has GTPase activity and shuttles between a GDP-bound form and a GTP-bound form, and farnesylation of the protein is required for this activity. Three pseudogenes have been mapped, two on chromosome 10 and one on chromosome 22. [provided by RefSeq, Jul 2008]

RHEB: Stimulates the phosphorylation of S6K1 and EIF4EBP1 through activation of mTORC1 signaling. Activates the protein kinase activity of mTORC1. Has low intrinsic GTPase activity. Binds to mTORC1 in a guanyl nucleotide-independent manner. Interacts directly with MTOR, MLST8 and RPTOR. Interacts with TSC2. Ubiquitous. Highest levels observed in skeletal and cardiac muscle. Alternates between an inactive form bound to GDP and an active form bound to GTP. Inactivated by TSC1-TSC2 via the GTPase activating protein (GAP) domain of TSC2. Belongs to the small GTPase superfamily. Rheb family.

Protein type: G protein; G protein, monomeric; G protein, monomeric, Rheb

Chromosomal Location of Human Ortholog: 7q36

Cellular Component: lysosomal membrane; membrane

Molecular Function: GTP binding; GTPase activity

Biological Process: cell cycle arrest; macroautophagy; positive regulation of TOR signaling pathway; signal transduction