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- W1484291826 abstract "Regulatory aspects of chromosome replication were investigated in dnaA5 and dnaC2 mutants of the Escherichia coli B/r F. When cultures growing at 25 degrees C were shifted to 41 degrees C for extended periods and then returned to 25 degrees C, the subsequent synchronous initiations of chromosome replication were spaced at fixed intervals. When chloramphenicol was added coincident with the temperature downshift, the extend of chromosome replication in the dnaA mutant was greater than that in the dnaC mutant, but the time intervals between initiations were the same in both mutants. Furthermore, the time interval between the first two initiation events was unaffected by alterations in the rate of rifampin-sensitive RNA synthesis or cell mass increase. In the dnaC2 mutant, the capacities for both initiations were achieved in the absence of extensive DNA replication at 25 degrees C as long as protein synthesis was permitted, but the cells did not progress toward the second initiation at 25 degrees C when both protein synthesis and DNA replication were prevented. Cells of the dnaA5 mutant did not achieve the capacity for the second initiation event in the absence of extensive chromosome replication, although delayed initiation may have taken place. A plausible hypothesis to explain the data is that the minimum interval is determined by the time required for formation of a supercoiled, membrane-attached structure in the vicinity of oriC which is required for initiation of DNA synthesis." @default.
- W1484291826 created "2016-06-24" @default.
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- W1484291826 date "1982-02-01" @default.
- W1484291826 modified "2023-09-29" @default.
- W1484291826 title "Initiation of chromosome replication in dnaA and dnaC mutants of Escherichia coli B/r F" @default.
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- W1484291826 doi "https://doi.org/10.1128/jb.149.2.685-693.1982" @default.
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