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- W1967595710 abstract "Brefeldin A, a fungal metabolite which disrupts protein traffic, provokes indirect activation of cdc2 protein kinase in Xenopus oocytes. Cdc2 protein kinase activation was judged by MPF (M-phase factor) transfer activity, histone H1 kinase activity, and phosphorylation in vivo of the guanine-nucleotide exchange complex EF-1 beta gamma delta. Oocytes resumed complete meiosis upon brefeldin A treatment. Cdc2 protein kinase, MAP kinase, cyclin B, MPF, and protein synthesis changes were all comparable in brefeldin A-treated oocytes and in progesterone-induced oocytes. ED50 for brefeldin A was 0.6 microM. Brefeldin A activation of cdc2 protein kinase occurs with a long time course. Simultaneous treatment of the oocytes at a subthreshold concentration of 1 nM progesterone and 30 microM brefeldin A considerably shortened the kinetics of maturation. Brefeldin A induction of maturation was sensitive to drugs that act on cAMP metabolism. ID50 for IBMX was 0.1 mM, compared to 1 mM for progesterone-treated oocytes. Brefeldin A inhibited protein traffic in oocytes as determined from protein export experiments. ID50 was between 0.1 and 1 microM. Our results give new insights into the possible mechanism of induction of meiotic maturation and further demonstrate that brefeldin A acts on cell cycle regulatory elements." @default.
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- W1967595710 date "1995-07-01" @default.
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- W1967595710 title "Brefeldin A Provokes Indirect Activation of cdc2 Kinase (MPF) in Xenopus Oocytes, Resulting in Meiotic Cell Division" @default.
- W1967595710 doi "https://doi.org/10.1006/dbio.1995.1209" @default.
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