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• W2111777915 endingPage "2546" @default.
• W2111777915 startingPage "2531" @default.
• W2111777915 abstract "In complex with FKBP12, the immunosuppressant rapamycin binds to and inhibits the yeast TOR1 and TOR2 proteins and the mammalian homologue mTOR/FRAP/RAFT1. The TOR proteins promote cell cycle progression in yeast and human cells by regulating translation and polarization of the actin cytoskeleton. A C-terminal domain of the TOR proteins shares identity with protein and lipid kinases, but only one substrate (PHAS-I), and no regulators of the TOR-signaling cascade have been identified. We report here that yeast TOR1 has an intrinsic protein kinase activity capable of phosphorylating PHAS-1, and this activity is abolished by an active site mutation and inhibited by FKBP12-rapamycin or wortmannin. We find that an intact TOR1 kinase domain is essential for TOR1 functions in yeast. Overexpression of a TOR1 kinase-inactive mutant, or of a central region of the TOR proteins distinct from the FRB and kinase domains, was toxic in yeast, and overexpression of wild-type TOR1 suppressed this toxic effect. Expression of the TOR-toxic domain leads to a G1 cell cycle arrest, consistent with an inhibition of TOR function in translation. Overexpression of the PLC1 gene, which encodes the yeast phospholipase C homologue, suppressed growth inhibition by the TOR-toxic domains. In conclusion, our findings identify a toxic effector domain of the TOR proteins that may interact with substrates or regulators of the TOR kinase cascade and that shares sequence identity with other PIK family members, including ATR, Rad3, Mei-41, and ATM." @default.
• W2111777915 created "2016-06-24" @default.
• W2111777915 creator A5037932444 @default.
• W2111777915 creator A5046012603 @default.
• W2111777915 creator A5052159588 @default.
• W2111777915 date "1999-08-01" @default.
• W2111777915 modified "2023-09-28" @default.
• W2111777915 title "Protein Kinase Activity and Identification of a Toxic Effector Domain of the Target of Rapamycin TOR Proteins in Yeast" @default.
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• W2111777915 doi "https://doi.org/10.1091/mbc.10.8.2531" @default.
• W2111777915 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/25485" @default.
• W2111777915 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/10436010" @default.
• W2111777915 hasPublicationYear "1999" @default.
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