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- W126989734 abstract "Increased phosphorylation of S6, a 40S ribosomal subunit protein, is observed in mammalian cells in response to growth factors and phorbol esters. The goal of this study was to identify the S6 kinase that is stimulated by phorbol ester treatment of MDCK cells. MDCK clone D1 cells express high levels of protein kinase C(PKC). PKC and S6 kinase activities were measured following DEAE-Sephacel fractionation of cytosol; this procedure separated the two kinase activities. When confluent MDCK-D1 cells were exposed to 100 nM phorbol 12-myristate 13-acetate (PMA), 95% of the total cellular PKC activity became associated with the particulate fraction within 1 hour. Cytosolic S6 kinase activity was maximal by 1 hour and then declined thereafter, preceding any detectable loss of total cellular PKC. The PMA-responsive S6 kinase was partially purified from MDCK-D1 cytosol by consecutive steps of DEAE-Sephacel, ammonium sulfate precipitation, Ultrogel AcA 34, heparin-agarose, and Ultrogel AcA 34. The partially-purified enzyme had an apparent molecular size of approximately 80 kDa. In addition to S6, the enzyme phosphorylated synthetic peptides based on the carboxyl terminal sequence of S6. S6 kinase activity utilized ATP but not GTP, and was inhibited by heparin, NaCl, and ..beta..-glycerophosphate. In conclusion, a phorbol ester-stimulated S6more » kinase has been partially purified from an epithelial cell line. This kinase is distinct from PKC.« less" @default.
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- W126989734 date "1987-05-01" @default.
- W126989734 modified "2023-09-28" @default.
- W126989734 title "Characterization of a phorbol ester-stimulated S6 kinase from MDCK renal epithelial cells" @default.
- W126989734 hasPublicationYear "1987" @default.
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