含质粒的大肠杆菌B/r中的染色体复制与细胞分裂。
Chromosome replication and cell division in plasmid-containing Escherichia coli B/r.
作者信息
Weinberger M, Helmstetter C E
出版信息
J Bacteriol. 1979 Mar;137(3):1151-7. doi: 10.1128/jb.137.3.1151-1157.1979.
Abstract
The kinetics of chromosome replication and cell division have been examined in recA mutants of Escherichia coli B/r containing F' plasmids of various sizes. Plasmid-mediated alterations in growth properties were detected only with the presence of the larger F' plasmids, and were reflected in decreased mean cell sizes and growth rates. The lengths of C and D in all plasmid-containing strains were in accord with the values for plasmid-free parental strains growing with similar generations times. The findings were consistent with an absence of competition between the chromosomal and extrachromosomal replicons for rate-limiting components involved in the initiation of deoxyribonucleic acid synthesis or in the elongation of deoxyribonucleic acid chains.
摘要
已对含有各种大小F'质粒的大肠杆菌B/r的recA突变体中的染色体复制动力学和细胞分裂进行了研究。仅在存在较大的F'质粒时才检测到质粒介导的生长特性改变，这反映在平均细胞大小和生长速率降低上。所有含质粒菌株中C期和D期的长度与生长世代时间相似的无质粒亲本菌株的值一致。这些发现与染色体和染色体外复制子之间不存在对参与脱氧核糖核酸合成起始或脱氧核糖核酸链延伸的限速成分的竞争相一致。
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