在细胞循环进展过程中,Cdc13坐标端粒延长的Cdk1依赖酸化
Shang Li1, Svetlana Makovets, Tetsuya Matsuguchi
1Department of Biochemistry and Biophysics, University of California, San Francisco, Box 2200, San Francisco, CA 94143-2200, USA.
Cell
|January 13, 2009
概括
发芽酵母端粒的长度是由Cdc13酸化调节的. 这种由Cdk1 (环素依赖激酶1) 的酸化确保端粒酶 (端粒延长酶) 被招募到端粒,将细胞分裂与端粒维护联系起来.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
背景情况:
- 端粒保护染色体末端,随着每个细胞分裂而缩短.
- 端粒酶延长端粒,保持基因组的稳定性.
- 在芽酵母中,Cdc13对于端粒长度恒常至关重要,它与端粒酶和Stn1-Ten1.1相互作用.
研究的目的:
- 阐明将细胞循环进展与酵母中的端粒延长联系在一起的机制.
- 为了确定细胞周期调节的控制端粒维持的因素.
- 调查循环林依赖激酶1 (Cdk1) 在端粒调节中的作用.
主要方法:
- 在Saccharomyces cerevisiae中研究了Cdk1依赖Cdc13的酸化.
- 利用生物化学测试来分析蛋白质与蛋白质之间的相互作用.
- 在体内研究了端粒体对端粒体的端粒酶复合物的招募.
主要成果:
- 对Cdc13的Cdk1依赖酸化对于有效的端粒延长至关重要.
- 酸化改变了Cdc13的相互作用偏好,使Est1优于Stn1-Ten1.
- 这种机制确保了端粒酶对端粒的细胞循环依赖的招募.
结论:
- 通过Cdk1介导的Cdc13酸化提供了细胞循环控制和端粒延长之间的直接联系.
- 这项规定确保了DNA复制和端粒维护的适当协调.
- 这些发现提供了对端粒长度恒常的分子机制的见解.
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