循环二-GMP作为细胞周期振荡器,驱动染色体复制
1Focal area of Infection Biology, Biozentrum, University of Basel, 4056 Basel, Switzerland.
Nature
|May 7, 2015
概括
细菌使用循环 diguanylate (c-di-GMP) 分子来协调细胞分裂和发育,类似于eukaryotes中的循环素. 振荡的c-di-GMP水平控制了Caulobacter crescentus中的细胞周期进展和复制不对称性.
科学领域:
- 微生物学 微生物学
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
背景情况:
- 细胞核生物通过循环素和循环素依赖性激酶协调细胞分裂和分化.
- 对于平衡细胞分裂和命运决策的细菌调节系统的了解很少.
- 调整细菌分裂与发育程序的机制需要阐明.
研究的目的:
- 为了研究周期性迪加尼酸盐 (c-di-GMP) 在协调Caulobacter crescentus的细胞周期中的作用.
- 阐明c-di-GMP如何调节细胞循环中必不可少的细胞激酶CckA.
- 了解细菌细胞分裂期间c-di-GMP对CckA的空间控制.
主要方法:
- 测量振荡周期性迪加尼酸盐 (c-di-GMP) 水平的测量.
- 证明了c-di-GMP与CckA激酶的直接结合.
- 对c-di-GMP对CckA激酶和酶活性的影响的分析.
- 研究c-di-GMP在细胞分裂期间对CckA的空间控制.
主要成果:
- 振荡的c-di-GMP水平驱动了Caulobacter crescentus的细胞周期.
- c-di-GMP 直接与 CckA 结合,抑制激酶和刺激酸酶活性.
- 增加c-di-GMP将CckA切换到酸酶模式,使复制和细胞周期进展成为可能.
- c-di-GMP在空间上控制CckA以在子细胞中建立复制不对称性.
结论:
- c-di-GMP 作为细菌的环素样分子,协调染色体复制与细胞形态发生.
- 这种c-di-GMP介导的控制机制在其他细菌中保留着,比如Agrobacterium tumefaciens.
- c-di-GMP代表了一种调节细菌行为,持久性和繁殖的一般机制.
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