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- W1488282372 abstract "Previous studies have shown that increased ribosomal protein S6 kinase activity in unfertilized Xenopus eggs can be resolved by DEAE-Sephacel chromatography into two peaks, designated S6 kinase I and S6 kinase II. We show here that antibody against bacterially expressed S6 kinase II cross-reacts with S6 kinase I. Both S6 kinases undergo marked phosphorylation when they are activated during oocyte maturation, and both become deactivated and dephosphorylated upon activation of eggs. Immunoblotting of extracts of oocytes reveals that all S6 kinase molecules undergo a decrease and increase in electrophoretic mobility upon activation and deactivation, respectively. The increase in electrophoretic mobility can be produced in vitro by incubation of activated S6 kinase with purified phosphatases. Phosphoamino acid analysis of S6 kinase II labeled in vivo during maturation reveals both phosphoserine and phosphothreonine, and phosphopeptide maps suggest that several kinases may phosphorylate and activate S6 kinase II in vivo. These results demonstrate that, during oocyte maturation and early development, S6 kinase activation and deactivation are regulated by phosphorylation and dephosphorylation, suggesting a probable mechanism for S6 kinase regulation in other mitogenically stimulated cells." @default.
- W1488282372 created "2016-06-24" @default.
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- W1488282372 date "1989-08-01" @default.
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- W1488282372 title "In vivo Phosphorylation and Activation of Ribosomal Protein S6 Kinases during Xenopus Oocyte Maturation" @default.
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- W1488282372 doi "https://doi.org/10.1016/s0021-9258(18)80057-6" @default.
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