Alarcon CM, et al. (1996) (original) (raw)
Reference: Alarcon CM, et al. (1996)
Abstract
In complex with the prolyl isomerase FKBP12, the natural product rapamycin blocks signal transduction in organisms as diverse as yeast and man. The yeast targets of FKBP12-rapamycin, TOR1 and TOR2, are large proteins with homology to lipid and protein kinases. A mammalian FKBP12-rapamycin binding protein, RAFT1, shares 39% and 43% identity with TOR1 and TOR2 proteins, respectively but has not been linked to rapamycin action in vivo. We find that when expressed in yeast, neither wild-type nor mutant RAFT1 complemented tor mutations or conferred rapamycin resistance. In contrast, TOR1-RAFT1 and TOR1-RAFT1 hybrid proteins containing the carboxy-terminal RAFT1 kinase domain complemented tor2 and tor1 mutant strains, respectively. Moreover, TOR2-RAFT1 and TOR1-RAFT1 hybrid proteins mutated at the position corresponding to rapamycin-resistant TOR mutants (S20351) conferred rapamycin resistance. Like the TOR2 protein, the TOR2-RAFT1 proteins were stably expressed, localized to the vacuolar surface, and associated with a phosphatidylinositol-4 kinase activity. These findings directly link the mammalian TOR homolog RAFT1 to rapamycin action in vivo and indicate that the TOR/RAFT1 kinase domain has been functionally conserved from yeast to man.
PMID: 8595879
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Reference Type
Journal Article | Research Support, Non-U.S. Gov't | Research Support, U.S. Gov't, P.H.S.
Authors
Alarcon CM, Cardenas ME, Heitman J
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