Cdc13坐标与Ku的双重DNA结合能力可以保护端粒完整性
bioRxiv : the preprint server for biology
|November 24, 2025
概括
酵母端粒中的Cdc13蛋白结合单链和双链DNA,保护染色体末端. 端粒损伤会触发适应性代谢变化,如增强的胺通路,改善细胞适应性.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 细胞生物学 细胞生物学
背景情况:
- 端粒保护真核染色体末端免受退化和DNA修复.
- Cdc13-Stn1-Ten1 (CST) 复合体对于*Saccharomyces cerevisiae*中的端粒维护至关重要.
- 端粒保护涉及多个复合体,包括CST,Ku和Rap1-Rif1-Rif2.
研究的目的:
- 为了研究Cdc13在已知的单链结合之外,在端粒保护中的作用.
- 了解Cdc13如何与DNA连接处相互作用并影响其他端粒结合复合体.
- 探索破坏端粒保护对细胞适应和新陈代谢的影响.
主要方法:
- 酵母遗传学和分子生物学技术.
- 在端粒的蛋白质-DNA相互作用的分析.
- 端粒保护突变体的表型分析,包括灵敏度测定和代谢分析.
主要成果:
- Cdc13与单链和双链端粒DNA的结点结合.
- 这种结合会影响Ku复合体的定位,可能会阻止末端的结合.
- 在Cdc13中发生的突变 (例如,cdc13-K504E) 会导致对DNA损伤的过敏和EXO1过度表达.
- 端粒保护突变体表现出适应性代谢重编程,特别是增加了胺通路活性,在静止阶段增强了健康状况.
结论:
- Cdc13通过结合单链突起和相邻的双重DNA,在端粒保护中发挥双重作用.
- Cdc13和Ku复合体合作保护端粒末端,破坏导致不稳定.
- 端粒侵蚀可以作为压力诱导的适应性代谢重编程的信号,改善生存率.
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