The Cyclin B2/CDK1 Complex Conservatively Inhibits Separase Activity in Oocyte Meiosis II.

The Cyclin B2/CDK1 Complex Conservatively Inhibits Separase Activity in Oocyte Meiosis II.
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细胞周期蛋白 B2/CDK1 复合物保守抑制卵母细胞减数分裂 II 中的分离酶活性

DOI:
10.3389/fcell.2021.648053
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发表时间:
2021
影响因子:
5.5
通讯作者:
Qian WP
Qian WP
中科院分区:
生物学2区
文献类型:
--
作者:
Li J;Zhang HY;Wang F;Sun QY;Qian WP

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最近,我们报道了cyclin B2/CDK 1复合物通过抑制分离酶活性调节卵母细胞减数分裂Ⅰ中同源染色体的分离,进一步阐明了cyclin B2在减数分裂Ⅰ中对cyclin B1功能的补偿作用。然而,细胞周期蛋白B2/CDK 1复合物是否也负调控分离酶活性在卵母细胞减数分裂II仍然未知。本研究探讨了cyclin B2在卵母细胞减数分裂II中的作用。我们发现,稳定的细胞周期蛋白B2的表达阻碍分离后的卵母细胞孤雌激活的姐妹染色单体。一致,稳定的细胞周期蛋白B2抑制分离酶的激活,而引入非磷酸化分离酶突变体挽救染色单体分离在稳定的细胞周期蛋白B2表达的卵母细胞。因此,在小鼠卵母细胞减数分裂I和减数分裂II中,细胞周期蛋白B2/CDK 1复合物通过抑制分离酶的磷酸化来保守地调节分离酶活性。
Recently, we have reported that the cyclin B2/CDK1 complex regulates homologous chromosome segregation through inhibiting separase activity in oocyte meiosis I, which further elucidates the compensation of cyclin B2 on cyclin B1’s function in meiosis I. However, whether cyclin B2/CDK1 complex also negatively regulates separase activity during oocyte meiosis II remains unknown. In the present study, we investigated the function of cyclin B2 in meiosis II of oocyte. We found that stable cyclin B2 expression impeded segregation of sister chromatids after oocyte parthenogenetic activation. Consistently, stable cyclin B2 inhibited separase activation, while introduction of non-phosphorylatable separase mutant rescued chromatid separation in the stable cyclin B2-expressed oocytes. Therefore, the cyclin B2/CDK1 complex conservatively regulates separase activity via inhibitory phosphorylation of separase in both meiosis I and meiosis II of mouse oocyte.
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