FEATURES

FAMILY

DESCRIPTION

Also known as RPTOR_HUMAN, RPTOR, KIAA1303, RAPTOR. Involved in the control of the mammalian target of rapamycin complex 1 (mTORC1) activity which regulates cell growth and survival, and autophagy in response to nutrient and hormonal signals; functions as a scaffold for recruiting mTORC1 substrates. mTORC1 is activated in response to growth factors or amino acids. Growth factor-stimulated mTORC1 activation involves a AKT1-mediated phosphorylation of TSC1-TSC2, which leads to the activation of the RHEB GTPase that potently activates the protein kinase activity of mTORC1. Amino acid-signaling to mTORC1 requires its relocalization to the lysosomes mediated by the Ragulator complex and the Rag GTPases. Activated mTORC1 up-regulates protein synthesis by phosphorylating key regulators of mRNA translation and ribosome synthesis. mTORC1 phosphorylates EIF4EBP1 and releases it from inhibiting the elongation initiation factor 4E (eiF4E). mTORC1 phosphorylates and activates S6K1 at 'Thr-389', which then promotes protein synthesis by phosphorylating PDCD4 and targeting it for degradation. Involved in ciliogenesis. mTORC1 complex in excitatory neuronal transmission is required for the prosocial behavior induced by the psychoactive substance lysergic acid diethylamide (LSD) (By similarity). Part of the mammalian target of rapamycin complex 1 (mTORC1) which contains MTOR, MLST8, RPTOR, AKT1S1/PRAS40 and DEPTOR (PubMed:12150925, PubMed:12408816, PubMed:17386266, PubMed:25940091). mTORC1 binds to and is inhibited by FKBP12-rapamycin (PubMed:12408816, PubMed:15066126). Binds directly to 4EBP1 and RPS6KB1 independently of its association with MTOR (PubMed:12150925, PubMed:12150926). Binds preferentially to poorly or non-phosphorylated forms of EIF4EBP1, and this binding is critical to the ability of MTOR to catalyze phosphorylation (PubMed:12747827). Forms a complex with MTOR under both leucine-rich and -poor conditions. Interacts with ULK1 in a nutrient-dependent manner; the interaction is reduced during starvation (PubMed:19211835). Interacts (when phosphorylated by AMPK) with 14-3-3 protein, leading to inhibition of its activity (PubMed:18439900). Interacts with SPAG5; SPAG5 competes with MTOR for RPTOR-binding, resulting in decreased mTORC1 formation. Interacts with WAC; WAC positively regulates MTOR activity by promoting the assembly of the TTT complex composed of TELO2, TTI1 and TTI2 and the RUVBL complex composed of RUVBL1 and RUVBL2 into the TTT-RUVBL complex which leads to the dimerization of the mTORC1 complex and its subsequent activation (PubMed:26812014). Interacts with G3BP1. The complex formed with G3BP1 and SPAG5 is increased by oxidative stress (PubMed:23953116). Interacts with HTR6 (PubMed:23027611). Interacts with PIH1D1 (PubMed:24036451). Interacts with LARP1 (PubMed:25940091). Interacts with BRAT1 (PubMed:25657994). Interacts with SIK3 (PubMed:30232230). Interacts with SLC38A7; this interaction mediates the recruitment of mTORC1 to the lysosome and its subsequent activation (PubMed:35561222).

EXTERNAL LINKS

RPTOR

Regulatory-associated protein of mTOR

RPTOR

Molecular Synopsis