聚球藻属PCC 6301菌株中DNA循环与生长速率之间的关系。
Relationship between DNA cycle and growth rate in Synechococcus sp. strain PCC 6301.
作者信息
Binder B J, Chisholm S W
机构信息
Ralph M. Parsons Laboratory, Massachusetts Institute of Technology, Cambridge 02139.
出版信息
J Bacteriol. 1990 May;172(5):2313-9. doi: 10.1128/jb.172.5.2313-2319.1990.
Abstract
Flow cytometry was used to examine cell cycle regulation in Synechococcus sp. strain PCC 6301 under a variety of growth conditions. The DNA frequency distributions of exponentially growing and dark-blocked populations confirmed that this cyanobacterium contains multiple chromosome copies even at very slow growth rates. Furthermore, the presence of major peaks corresponding to other than 2" chromosome copies strongly suggests that DNA replication is initiated asynchronously. Although this suggestion is at odds with the standard formulation of the procaryotic cell cycle model, it is similar to recent observations of asynchrony in Escherichia coli replication mutants.
摘要
运用流式细胞术检测了聚球藻属PCC 6301菌株在多种生长条件下的细胞周期调控。指数生长期和黑暗阻断群体的DNA频率分布证实，即使在非常缓慢的生长速率下，这种蓝细菌也含有多个染色体拷贝。此外，对应于非2倍染色体拷贝的主要峰的存在强烈表明DNA复制是异步启动的。尽管这一观点与原核细胞周期模型的标准表述不一致，但它与最近在大肠杆菌复制突变体中观察到的异步现象相似。
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