Raptor and mTOR: Subunits of a nutrient-sensitive complex

D. H. Kim, D. M. Sabatini

Research output: Contribution to journalReview articlepeer-review

106 Scopus citations


mTOR/RAFT1/FRAP is the target of the FKBP12-rapamycin complex as well as a central component of a nutrient- and hormone-sensitive pathway that controls cellular growth. Recent work reveals that mTOR interacts with a novel evolutionarily conserved protein that we named raptor, for "regulatory associated protein of MTOR." Raptor-has several roles in the mTOR pathway. It is necessary for nutrient-mediated activation of the downstream effector S6K1 and increases in cell size. In addition, under conditions that repress the mTOR pathway, the association of raptor with mTOR is strengthened, leading to a decrease in mTOR kinase activity. Raptor is a critical component of the mTOR pathway that regulates cell growth in response to nutrient levels by associating with mTOR.

Original languageEnglish (US)
Pages (from-to)259-270
Number of pages12
JournalCurrent Topics in Microbiology and Immunology
StatePublished - Sep 8 2003


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