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• W1977431364 abstract "We have previously found and characterized a mitogen-activated, serine/threonine-specific protein kinase that specifically phosphorylates microtubule-associated protein 2 (MAP2) in vitro, which we call here MAP2 kinase [Hoshi, M., Nishida, E. & Sakai, H. (1988) J. Biol. Chem. 263, 5396-5401; Hoshi, M., Nishida, E. & Sakai, H. (1989) Eur. J. Biochem. 184, 477-486]. In this study, we have found another serine/threonine-specific protein kinase that is activated by various mitogens. The activated kinase utilized microtubule-associated protein 1B (MAP1B) as the major substrate in vitro, so we tentatively call it MAP1B kinase (M1BK). M1BK was maximally activated 20-30 min after treatment of quiescent rat fibroblastic 3Y1 cells with epidermal growth factor (EGF), while MAP2 kinase was maximally activated within 5-10 min of EGF treatment. The EGF-activated M1BK was eluted at about 0.15 M NaCl on a DEAE-cellulose column, while the activated MAP2 kinase was eluted at about 0.1 M NaCl under the conditions used. The EGF-activated M1BK was eluted as a single peak just after the activated MAP2 kinase on an HPLC gel-filtration column. Histone, casein and ribosomal protein S6 were very poor substrates for the M1BK, while MAP2 and myelin basic protein were moderate substrates. The M1BK activity in cell extracts was inhibited by Ca2+, glycerol 2-phosphate and Zn2+, and slightly enhanced by heparin. These data suggested that M1BK is distinct from previously described mitogen-activated kinases such as MAP2 kinase, casein kinase II and S6 kinase. Pretreatment with cycloheximide or puromycin did not block the M1BK activation by EGF. Furthermore, incubation of the EGF-activated M1BK with acid phosphatase inactivated the kinase activity. Therefore, M1BK may be activated by phosphorylation in EGF-treated cells. In addition to EGF, 12-O-tetradecanoylphorbol 13-acetate, platelet-derived growth factor and insulin-like growth factor-I also induced the activation of M1BK in quiescent cells." @default.
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• W1977431364 date "1990-10-01" @default.
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• W1977431364 title "Activation of a serine/threonine kinase that phosphorylates microtubule-associated protein 1B in vitro by growth factors and phorbol esters in quiescent rat fibroblastic cells" @default.
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• W1977431364 doi "https://doi.org/10.1111/j.1432-1033.1990.tb19366.x" @default.
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