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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Schmitt, Anja Nebreda, Angel R. |
| Description | Author Affiliation: Schmitt A ( European Molecular Biology Laboratory, Meyerhofstrasse 1, 69117 Heidelberg, Germany.); |
| Abstract | Progesterone induces G2-arrested Xenopus oocytes to develop into fertilizable eggs in a process called meiotic maturation. Protein kinase A (PKA), the cAMP-dependent protein kinase, has long been known to be a potent inhibitor of meiotic maturation, but little information is available on how PKA functions. We have cloned two Xenopus PKA catalytic subunit isoforms, XPKAalpha and XPKAbeta. These proteins are 89% identical and both inhibit progesterone-induced meiotic maturation when overexpressed at low levels, suggesting that PKA activity is tightly regulated in the oocyte. Unexpectedly, catalytically inactive XPKA mutants are able to block progesterone-induced maturation as efficiently as the wild-type active XPKA. These mutants also block meiotic maturation induced by Mos, but are less efficient at inhibiting Cdc25C-induced maturation. Our results indicate that PKA can inhibit meiotic maturation by a novel mechanism, which does not require its kinase activity and is also independent of binding to the PKA regulatory subunits. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 7 |
| Volume Number | 99 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 2002-04-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Cyclic AMP-Dependent Protein Kinases Physiology Meiosis Oocytes Animals Cell Cycle Proteins Drug Effects Molecular Sequence Data Progesterone Pharmacology Protein Subunits Ribosomal Protein S6 Kinases Xenopus Cdc25 Phosphatases Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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