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- W1506402600 abstract "We previously showed that purified, bacterially expressed oncogenic human rasH protein blocks or delays the progression of the embryonic cell cycle into M-phase in activated Xenopus egg extracts. This block correlates with the suppression of the activation of p34cdc2 kinase (Pan, B.-T., Chen, C.-T., and Lin, S.-M. (1994) J. Biol. Chem. 269, 5968-5975). In an attempt to identify kinases that are involved in mediating the effect of oncogenic Ras on the cell cycle, we assayed aliquots of activated Xenopus egg extracts, which were incubated at 25 degrees C for various times in the absence and presence of oncogenic Ras, for their kinase activities toward a calf thymus histone fraction (Hf1). We find that the suppression of the histone H1 kinase activity of p34cdc2 by oncogenic Ras correlates with a simultaneous stimulation of a histone H2b serine kinase activity. Using a histone H2b in-the-gel kinase assay, we further show that the stimulated histone H2b kinase activity is attributed mainly to a 96-kDa kinase and slightly to p42mapk. Although Xenopus p90rsk is also activated by oncogenic Ras, we demonstrate that activated p90rsk is not responsible for the 96-kDa histone H2b kinase activity. The identity of the 96-kDa kinase remains unclear. Our data suggests that the 96-kDa kinase may be involved in mediating the effect of oncogenic Ras on the embryonic cell cycle of Xenopus." @default.
- W1506402600 created "2016-06-24" @default.
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- W1506402600 date "1994-11-01" @default.
- W1506402600 modified "2023-09-28" @default.
- W1506402600 title "Oncogenic ras stimulates a 96-kDa histone H2b kinase activity in activated Xenopus egg extracts. Correlation with the suppression of p34cdc2 kinase." @default.
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- W1506402600 doi "https://doi.org/10.1016/s0021-9258(18)46891-3" @default.
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