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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

The mammalian target of rapamycin phosphorylates sites having a (Ser/Thr)-Pro motif and is activated by antibodies to a region near its COOH terminus.

The eukaryotic initiation factor 4E (eIF4E)-binding protein, PHAS-I, was phosphorylated rapidly and stoichiometrically when incubated with [gamma-32P]ATP and the mammalian target of rapamycin (mTOR) that had been immunoprecipitated with an antibody, mTAb1, directed against a region near the COOH terminus of mTOR. PHAS-I was phosphorylated more slowly by mTOR obtained either by immunoprecipitation with other antibodies or by affinity purification using a rapamycin/FKBP12 resin. Adding mTAb1 to either of these preparations of mTOR increased PHAS-I phosphorylation severalfold, indicating that mTAb1 activates the mTOR protein kinase. mTAb1-activated mTOR phosphorylated Thr36, Thr45, Ser64, Thr69, and Ser82 in PHAS-I. All five of these sites fit a (Ser/Thr)-Pro motif and are dephosphorylated in response to rapamycin in rat adipocytes. Thus, our findings indicate that Pro is a determinant of the mTOR protein kinase specificity and that mTOR contributes to the phosphorylation of PHAS-I in cells.[1]


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