Protein tyrosine kinase Wee1B is essential for metaphase II exit in mouse oocytes.
Protein tyrosine kinase Wee1B is essential for metaphase II exit in mouse oocytes.
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DOI:
10.1126/science.1199211
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发表时间:
2011-04-22
期刊:
影响因子:
--
通讯作者:
Conti M
中科院分区:
文献类型:
--
作者:
Oh JS;Susor A;Conti M
Waves of cyclin synthesis and degradation regulate the activity of Cdc2 protein kinase during the cell cycle. Cdc2 inactivation by Wee1B-mediated phosphorylation is necessary for arrest of the oocyte at G2-prophase, but it is unclear whether this regulation functions later during the metaphase to anaphase transition. We show that reactivation of a Wee1B pathway triggers the decrease in Cdc2 activity during egg activation. When Wee1B is downregulated, oocytes fail to form a pronucleus in response to Ca2+ signals. Calcium-calmodulin-dependent kinase II (CaMKII) activates Wee1B, and CaMKII-driven exit from metaphase II (MII) is inhibited by Wee1B downregulation, demonstrating that exit from metaphase requires not only a proteolytic degradation of cyclin B, but also the inhibitory phosphorylation of Cdc2 by Wee1B.
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