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- W1538376298 abstract "Certain calmodulin (CaM)-dependent protein kinases phosphorylate substrates have been implicated in regulating cellular proliferation. In this study, CaM-dependent phosphorylation has been examined in normal and tumor tissue from rat brain to determine whether differences exist. Using in vitro phosphorylation reactions, we compared endogenous substrates for Ca2+/CaM-dependent protein kinases in rat brain white matter (RBWM), a tissue rich in normal glia, to those of C6 rat glioma cells. A major phosphoprotein having a M(r) of 100,000 was observed in proliferating C6 cells that was not present in RBWM or in nonproliferating cells. Phosphorylation was stimulated by Ca2+ and CaM and inhibited by trifluoperazine. An antibody to elongation factor 2 (EF-2) immunoprecipitated the M(r) 100,000 protein from C6 cells. EF-2 was present in RBWM but was not phosphorylated. Homogenates of RBWM did not phosphorylate exogenous EF-2, which suggested the absence of CaM kinase III activity in normal glial tissue. Furthermore, the addition of purified, exogenous CaM kinase III to homogenates of RBWM resulted in EF-2 phosphorylation. These data demonstrate that a basal level of EF-2 phosphorylation exists in proliferating glioma cells that is markedly diminished or absent in normal glial tissue and is due to the activity of CaM kinase III." @default.
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- W1538376298 date "1993-05-15" @default.
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- W1538376298 title "Phosphorylation of elongation factor 2 in normal and malignant rat glial cells." @default.
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