Whi5低化和高化动态控制细胞循环的进入和进展.
Jordan Xiao1, Jonathan J Turner1, Mardo Kõivomägi2
1Department of Biology, Stanford University, 327 Campus Dr., Stanford, CA 94305, USA.
Current biology : CB
|May 15, 2024
概括
细胞循环的进展依赖于循环素依赖性激酶酸化基质,如Whi5.5. 这项研究揭示了Whi5酸化如何调节G1/S过渡,对于通过S/G2/M阶段及时进展至关重要.
科学领域:
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
- 生物化学 生物化学
背景情况:
- 细胞循环的进展是由循环素依赖性激酶 (CDK) 化关键基质调节的.
- 在芽酵母中,Whi5是一种转录抑制剂,通过抑制Swi4/Swi6 (SBF) 复合体来控制G1/S过渡.
- Whi5酸化状态决定了它的活性和局部化,影响了细胞周期的进展.
研究的目的:
- 阐明控制Whi5多位点酸化的分子机制.
- 了解Whi5酸化如何调节细胞周期,特别是G1/S过渡.
- 为了研究Whi5酸化在细胞周期后期阶段的作用.
主要方法:
- 确定了19个化Whi5位点.
- 位点定向突变发生,以确定特定酸化位在G1低酸化中的作用.
- 分析Whi5高酸化动力学及其对原始化位点的依赖.
主要成果:
- 在Whi5中7个G1低酸化位点的突变导致细胞大小增加和G1/S过渡的延迟.
- 晚期G1中的Whi5过酸化取决于招募Cks1.1的原始化部位.
- 酸化对于Whi5核出口,正常细胞大小,SBF基因表达,以及通过G1/S和S/G2/M阶段的进展至关重要.
结论:
- Whi5酸化是发芽酵母中G1/S过渡的关键调节者.
- 该研究表明,Whi5酸化也是通过S / G2 / M阶段及时进展的必要条件,扩大其已知的调节作用.
- 了解Whi5酸化为细胞周期控制机制提供了洞察力.
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