Nonrandom F-plasmid replication in Escherichia coli K-12.
نویسنده
چکیده
Both the autonomous and chromosomally integrated F plasmids were found to replicate in a nonrandom fashion after a density transfer from heavy medium ([13C]glucose, 15NH4) to light medium ([12C]glucose, 14NH4). The data are consistent with the hypothesis that both the chromosome and the F plasmid are replicated in a cell cycle-specific manner. Thus, these data support the proposal (J. D. Keasling, B. O. Palsson, and S. Cooper, J. Bacteriol. 173:2673-2680, 1991) that plasmids replicate in a cell cycle-specific manner.
منابع مشابه
Replication of the Escherichia coli chromosome.
Cell size and DNA concentration were measured in Escherichia coli K-12 ET64. This strain carries a dnaA(Ts) mutation that has been suppressed by the insertion of the F plasmid into the chrontosome. ET64 can grow in a balanced steady state of exponential growth at the restrictive temperature for its dnaA allele (39°C), in which chromosome replication is controlled by the F plasmid, and at the pe...
متن کاملHfr Strains of Escherichia coli K-12
Since the first reports by Cavalli-Sforza (9) and Hayes (24) of strains of Escherichia coli K-12 which are conjugational donors of chromosomal markers at high frequency (Hfr strains), many other Hfr strains have been isolated and our understanding of the mechanisms involved in Hfr formation has increased considerably. All Hfr strains arise from the integration of a conjugative plasmid into the ...
متن کاملAbsence of RNase H allows replication of pBR322 in Escherichia coli mutants lacking DNA polymerase I.
rnh (formerly termed sdrA) mutants of Escherichia coli K-12, capable of continuous DNA replication in the absence of protein synthesis (stable DNA replication), are devoid of ribonuclease H (RNase H, EC 3.1.26.4) activity. Plasmid pBR322 was found to replicate in rnh mutants in the absence of DNA polymerase I, the polA gene product, which is normally required for replication of this plasmid. Th...
متن کاملThree clustered origins of replication in a promiscuous-plasmid replicon and their differential use in a PolA+ strain and a delta PolA strain of Escherichia coli K-12.
A 1,197-bp region of the broad-host-range plasmid pCU1 is adequate for its replication. Analysis of replicating molecules containing this region reveals three clustered origins of vegetative replication and replication proceeds bidirectionally from each in a theta mode. In an Escherichia coli polymerase I deletion mutant, utilization of one of these three origins was not detected. The potential...
متن کاملDNA segregation in Escherichia coli cells with 5-bromodeoxyuridine-substituted nucleoids.
The pattern of segregation of DNA in Escherichia coli K-12 was analyzed by labeling replicating DNA with 5-bromodeoxyuridine followed by differential staining of nucleoids. Three types of visible arrangement were found in four-nucleoid groups derived from a native nucleoid after two replication rounds. Type A, segregation of both old strands toward cell poles, appeared with the highest frequenc...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- Journal of bacteriology
دوره 174 7 شماره
صفحات -
تاریخ انتشار 1992