一个协调的激酶和酸酶网络调节了Stu2对酵母激酶的招募
Michael G Stewart1, Joseph S Carrier1, Jacob A Zahm2
1Department of Biochemistry, University of Utah School of Medicine, Salt Lake City, UT, USA.
在T866,Stu2微管聚合酶局部化受Polo样酶1 (PLK1/Cdc5) 酸化的调节,控制了亚纳相螺旋的进展. 这种酸化与PP2A/Cdc55酸酶相反,使得Stu2能够及时重新分配细胞分裂.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 相开始涉及协调的细胞事件,如染色体分离和重组.
- 微管聚合酶Stu2是细胞分裂过程中轴心动态的关键调节者.
- 在元相-亚相过渡时,Stu2的局部化从动态细胞转移到螺旋小管.
研究的目的:
- 阐明控制在甲相-亚相过渡时Stu2局部化的调控机制.
- 研究波罗样酶1 (PLK1/Cdc5) 和PP2A/Cdc55在Stu2调控中的作用.
- 了解Stu2酸化如何影响亚相螺旋的进展.
主要方法:
- 酸化部位映射和Stu2.2的突变发生.
- 在酵母模型中使用显微镜分析Stu2局部化.
- 生物化学试验评估Stu2.2上的酶和酸酶活动.
主要成果:
- PLK1/Cdc5在T866酸化Stu2,促进其在kinetochore与Ndc80复合物的解离.
- 循环素依赖激酶 (CDK/Cdc28) 促进了PLK1/Cdc5相互作用,并促进了Stu2核导入.
- PP2A/Cdc55在元相期间对抗Stu2T866上的PLK1/Cdc5活性,允许在分酶介导的PP2A抑制后在亚纳相发作时进行切换式再分配.
结论:
- Stu2再分配是一个严格规范的过程,涉及相反的酶和酸酶活动.
- 通过PLK1/Cdc5对Stu2T866的酸化对于正确的亚纳相旋功能至关重要.
- 这种调节网络突出了细胞分裂所必需的快速细胞骨调节.
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