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. Note: This description may include information from UniProtKB.
SS: The number of records in which this modification site was determined using site-specific methods. SS methods include amino acid sequencing, site-directed mutagenesis, modification site-specific antibodies, specific MS strategies, etc.