mTOR operates in mTORC1 and mTORC2 complexes that integrate growth factor and nutrient information into protein synthesis, autophagy tone, and metabolic programs.
What it is
mTOR is a serine/threonine kinase scaffolding into distinct complexes. mTORC1 is classically linked to S6K and 4E-BP1 regulation; mTORC2 contributes to AKT activation and cytoskeletal themes.
How it works
Growth factor pathways such as PI3K/AKT relieve repression upstream of mTORC1, while amino acid sensors modulate lysosomal mTORC1 recruitment. Active mTORC1 promotes anabolic programs and can suppress autophagy initiation cues.
Because AMPK can inhibit mTORC1 under energy stress, mTOR and AMPK pages form a natural educational pair.
Biological role
mTOR signaling is central to cell growth decisions. Research models use rapamycin-related compounds and genetic tools to dissect complex-specific roles.
Proteins involved
- mTOR
- Raptor (mTORC1)
- Rictor (mTORC2)
- S6K1
- 4E-BP1
- AMPK (antagonistic input)
Research summary
Landmark reviews define complex composition and nutrient sensing. Mitochondrial peptide papers sometimes discuss mTOR–AMPK balance; those links remain context-specific.
Descriptions summarize published mechanistic frameworks. Findings from cell culture or animal models should not be interpreted as proven clinical effects in humans.
Research limitations
Scientific references
- Saxton RA, Sabatini DM. mTOR signaling in growth, metabolism, and disease. Cell.
- Liu GY, Sabatini DM. Updated mTOR pathway reviews.