随着MPF的振荡,cdc25和cdc2-cyclin B之间有周期性关联
Cell
|January 24, 1992
概括
仙人掌卵细胞含有p72,一个cdc25的亲属,激活cdc2.2. 在M阶段,p72与cdc2-cyclin B结合,这表明细胞周期控制涉及蛋白相互作用,而不仅仅是基因调节.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 发展生物学 发展生物学
背景情况:
- 线粒分裂的开始需要cdc2蛋白激酶的激活.
- 成熟促进因子的激活取决于cdc2氨酸脱化.
- cdc25是特定的氨酸酸酶,可以激活cdc2.
研究的目的:
- 为了研究cdc25亲属p72在Xenopus卵细胞和胚胎中的作用.
- 为了确定p72是否在细胞周期期间与cdc2-cyclin B相互作用.
- 探索超越转录调节的线粒控制机制.
主要方法:
- 在Xenopus卵细胞中识别p72.
- 在Xenopus胚胎的细胞周期期间分析p72的丰度.
- 评估p72与cdc2-cyclin B的相关性.
- 检测M相相关激酶的催化活性.
主要成果:
- 奇诺普斯卵细胞具有相对的cdc25,p72.
- 在Xenopus胚胎的细胞周期中,p72的丰度不会波动.
- p72与cdc2-cyclin B表现出细胞周期依赖的关联,在M阶段达到峰值.
- 与p72相关的M相激酶具有催化活性.
结论:
- 甲基控制可能涉及cdc25和环林B-cdc2复合体之间的周期性物理关联.
- 除了对cdc25基因的转录调节之外,还可以通过其他机制来影响线粒控制.
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Checkpoints throughout the cell cycle serve as safeguards and gatekeepers, allowing the cell cycle to progress in favorable conditions and slow or halt it in problematic ones. This regulation is known as the cell cycle control system.
Cyclin-dependent kinases, or Cdks, work in concert with cyclins to control cell cycle transitions. M-Cdk, a complex of Cdk1 bound to M cyclin, is a well-known example of this coordinated control that drives the transition from the G2 to the M phase.
M cyclin...
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