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. 1996 Mar;16(3):800–809. doi: 10.1128/mcb.16.3.800

Inhibition of v-Mos kinase activity by protein kinase A.

Y Yang 1, C H Herrmann 1, R B Arlinghaus 1, B Singh 1
PMCID: PMC231060  PMID: 8622681

Abstract

We investigated the effect of cyclic AMP-dependent protein kinase (PKA ) on v-Mos kinase activity. Increase in PKA activity in vivo brought about either by forskolin treatment or by overexpression of PKA catalytic subunit resulted in a significant inhibition of v-Mos kinase activity. The purified PKA catalytic subunit was able to phosphorylate recombinant p37v-mos in vitro, suggesting that the mechanism of in vivo inhibition of v-Mos kinase involves direct phosphorylation by PKA. Combined tryptic phosphopeptide two-dimensional mapping analysis and in vitro mutagenesis studies indicated that Ser-56 is the major in vivo phosphorylation site on v-Mos. In vivo phosphorylation at Ser-56 correlated with slower migration of the v-Mos protein during sodium dodecyl sulfate-polyacrylamide gel electrophoresis. However, even though Ser-56 was phosphorylated by PKA, this phosphorylation was not involved in the inhibition of v-Mos kinase. The alanine-for-serine substitution at residue 56 did not affect the ability of v-Mos to autophosphorylate in vitro or, more importantly, to activate MEK1 in transformed NIH 3T3 cells. We identified Ser-263 phosphorylation, the Ala-263 mutant of v-Mos was not inhibited by forskolin treatment. From our results, we propose that the known inhibitory role of PKA in the initiation of oocyte maturation in mice could be explained at least in part by its inhibition of Mos kinase.

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Selected References

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