Mechanistic target of rapamycin complex 1 (mTORC1) (mTORC1)

The mechanistic target of rapamycin complex 1 (mTORC1) is a multi-protein kinase complex that acts as a central rheostat for cellular metabolism (Saxton & Sabatini, 2017, Cell). It integrates signals from nutrients, such as amino acids and glucose, with growth factor signaling and cellular energy status (Liu & Sabatini, 2020, Nat Rev Mol Cell Biol). When activated, mTORC1 promotes anabolic processes including protein, lipid, and nucleotide synthesis to support cell growth and proliferation (Ben-Sahra & Manning, 2017, Mol Cell). Simultaneously, it suppresses catabolic pathways like autophagy to maintain cellular homeostasis (Kim & Guan, 2019, Exp Mol Med). Dysregulation of mTORC1 is a key driver in various pathologies, including many types of cancer, where it facilitates uncontrolled biomass accumulation (Mossmann et al., 2018, Nat Rev Cancer). It also plays a significant role in metabolic diseases like type 2 diabetes and obesity, as well as in the aging process (Kennedy & Lamming, 2016, Cell Metab). Pharmacological targeting of mTORC1 includes rapalogs, which act as allosteric inhibitors, and newer ATP-competitive inhibitors that target the kinase domain directly (Benjamin et al., 2011, Nat Rev Drug Discov).

Other names

Mammalian target of rapamycin complex 1mTOR complex 1FRAP1 complexRAptor-mTOR complexNutrient-sensing mTOR pathway

mTORC1 activity is modulated through allosteric inhibition by rapalogs (e.g., sirolimus), which bind to FKBP12 to form a complex that sterically hinders the kinase, or through ATP-competitive inhibition of the mTOR catalytic domain (Benjamin et al., 2011, Nat Rev Drug Discov).