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Raptor (regulatory associated protein of TOR) is a conserved 150 kDa adaptor protein composed of a unique conserved region, three HEAT repeats and seven WD-40 repeats (1). Raptor recruits mTOR substrates S6K1 (p70 S6 kinase) and 4E-BP1, and regulates mTOR kinase activity (2-3). Even though Raptor is a positive regulator of mTOR, it has been shown that under nutrient deprivation, the Raptor-mTOR association is stabilized in a manner that inhibits mTOR kinase activity (1). Raptor association with mTOR is required for efficient S6K1 and 4E0BP1 phosphorylation (4).
