通过线粒化激活APC/C的分子机制
Suyang Zhang1, Leifu Chang1, Claudio Alfieri1
1MRC Laboratory of Molecular Biology, Francis Crick Avenue, Cambridge, CB2 0QH, UK.
Nature
|April 28, 2016
概括
通过蛋白质降解控制细胞分裂. 通过循环素依赖性激酶对APC/ C的酸化起到切换作用,使Cdc20激活并调节线粒分裂. 这项研究揭示了这一关键过程的分子机制.
科学领域:
- 细胞生物学
- 分子生物学
- 生物化学
背景情况:
- 酶促进复合体 (APC/C) 对于真核生物的细胞循环进展至关重要,它能调节细胞分裂和进入G1阶段的蛋白质降解.
- 通过Cdc20和Cdh1联合激活剂调节APC/ C活性,其相互作用受到酸化事件的影响.
- 通过APC/ C酸化调节协激剂结合和活性的确切机制尚不完全理解.
研究的目的:
- 阐明酸化如何控制APC/C及其协活性剂Cdc20之间的相互作用的分子基础.
- 研究特定的APC/C酸化位点在调节线性进展中的作用.
- 了解Cdc20和Cdh1联合激活剂对APC/C的不同调节.
主要方法:
- 使用冷电子显微镜 (cryo-EM) 来确定APC/C调节的结构基础.
- 进行生物化学分析以验证观察到的结构变化的功能影响.
- 实验室试验用于研究酸化和小分子抑制剂对APC/ C活性的影响.
主要成果:
- 发现了一种含有自抑制Apc1的酸化依赖分子切换器,该切换器调节了Cdc20与APC/ C的交互.
- 为了缓解这种自抑制,Cdk-cyclin复合体和Cks的加入到过化Apc3循环中至关重要.
- 小分子抑制剂tosi- l- arginine甲基通过与关键结合基因相互作用,选择性地抑制APC/ Cdc20活性.
结论:
- 通过调节协活性剂的结合和活性,APC/ C的酸化起到关键的调节机制的作用,控制了线粒细胞的进展.
- 这项研究揭示了Cdc20在转化过程中的APC/C激活的结构和生化基础.
- 这些发现为开发用于治疗的APC/Cdc20向抑制剂提供了基础.
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