Mechanistic target of rapamycin kinase complex (mTORC) (mTORC)

The mechanistic target of rapamycin (mTOR) kinase complex is a central hub in cellular signaling that integrates inputs from nutrients, energy levels, and growth factors to regulate cell growth, proliferation, and survival (UniProt P42345). It exists as two structurally and functionally distinct multiprotein complexes: mTORC1 and mTORC2 (PubMed: 28452027). mTORC1 primarily controls protein synthesis, lipid metabolism, and autophagy, while mTORC2 regulates the actin cytoskeleton and cell survival through the phosphorylation of Akt (PubMed: 31036593). Dysregulation of the mTOR pathway is frequently observed in various human diseases, particularly cancer, where it promotes uncontrolled cell division and resistance to apoptosis (PubMed: 29673301). Consequently, mTOR has become a major therapeutic target, with drugs ranging from first-generation rapalogs to second-generation ATP-competitive kinase inhibitors (PubMed: 21849461). Clinical use of these inhibitors requires monitoring for metabolic side effects such as hyperglycemia and dyslipidemia, as well as potential immunosuppression (PubMed: 27101306).

Other names

Mammalian target of rapamycin complexmTOR complexFRAP complexRAFT1 complexmTORC1mTORC2

Allosteric inhibition of mTORC1 via FKBP12 binding; ATP-competitive inhibition of the mTOR catalytic site; Dual inhibition of PI3K and mTOR catalytic domains.