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:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Conti M
Conti M
中科院分区:
其他
文献类型:
--
作者:
Oh JS;Susor A;Conti M

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细胞周期蛋白的合成和降解波调节Cdc 2蛋白激酶在细胞周期中的活性。Cdc 2失活Wee 1B介导的磷酸化是必要的逮捕卵母细胞在G2前期,但目前还不清楚这种调节功能后期中期到后期的过渡。我们发现,Wee 1B通路的重新激活触发了卵激活过程中Cdc 2活性的降低。当Wee 1B下调时,卵母细胞不能响应Ca 2+信号形成原核。钙-钙调蛋白依赖性激酶II(CaMKII)激活Wee 1 B,并且CaMKII驱动的从中期II(MII)的退出被Wee 1 B下调抑制,表明从中期退出不仅需要细胞周期蛋白B的蛋白水解降解,而且还需要Wee 1 B抑制Cdc 2的磷酸化。
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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