Hormonal regulation and identification of chicken progesterone receptor phosphorylation sites

L. A. Denner, W. T. Schrader, B. W. O'Malley, N. L. Weigel

Research output: Contribution to journalArticle

97 Scopus citations

Abstract

The present studies examine the effects of in vivo and in situ progesterone treatment in the regulation of site-specific phosphorylation of the chicken oviduct progesterone receptor (PR). By gas-phase protein sequencing we have identified three hormonally regulated phosphorylation sites: Ser-211, Ser-260, and Ser-530. We determined phosphorylation stoichiometries by analyzing the amounts of phosphorylated and dephosphorylated serine at each site. Stoichiometries of sites 211 and 260 were about 20% under basal conditions and increased 1.5-2-fold by in situ progesterone treatment. Site 530 was virtually absent under basal conditions and induced to >33% by in situ progesterone treatment. We tested several protein kinases for phosphorylation of the PR in vitro on these sites or peptides containing these sites. We found that the catalytic subunit of cAMP-dependent protein kinase mimicked the in vivo, hormone-induced altered mobility of the PRs in sodium dodecyl sulfate-polyacrylamide gel electrophoresis. Both the in vivo and in vitro alterations were reversed by alkaline phosphatase. Finally, we showed that cAMP-dependent protein kinase phosphorylated Ser-528.

Original languageEnglish (US)
Pages (from-to)16548-16555
Number of pages8
JournalJournal of Biological Chemistry
Volume265
Issue number27
StatePublished - Oct 22 1990
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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