Summary
An Escherichia coli mutant defective in replication of the chromosome has been isolated from temperature-sensitive mutants that cannot support colicin E1 plasmid DNA synthesis in the presence of chloramphenicol. Cellular DNA synthesis of the mutant ceases almost immediately after transfer to the nonpermissive temperature. The defect is due to a single mutation, dna-59, which is located close to the sites of dnaA mutations and a cou R mutation conferring DNA gyrase with resistance to coumermycin. The dna-59 mutant is not able to support DNA synthesis of λ phage at the high temperature. The mutant also restricts growth of ϕX174 phage at the high temperature, but permits formation of supercoiled closedcircular duplex replicative intermediates. T7 phage can grow on the mutant even at the high temperature.
A specialized transducing phage λimm 21[tna dnaA]#2 (Miki et al., 1978) supports growth of dna-59, dnaA46 and dna-167 cells at the high temperature. Some of the EDTA-resistant derivatives of the phage have lost part or all of the dnaA gene, but carry gene function complementing the defect of dna-59 cells, as judged by conversion of the above dna strains to wild type cells by phage infection, and by suppression of the loss of viability of dna-59 cells at the high temperature by phage infection. The gene containing the dna-59 mutation site is thus distinct from the dnaA gene. Since the dna-59 mutation does not affect expression of the cou r gene of DNA gyrase, which is another known gene involved in DNA synthesis near the dnaA gene, this mutation is probably in a new gene, dnaN. From analysis of the suppression activities of λimm 21[tna dnaA]#2 phage and its deletion derivatives against dnaN59 cells, it is suggested that the expression of the dnaN gene function is reduced by deletion in the dnaA region.
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Sakakibara, Y., Mizukami, T. A temperature-sensitive Escherichia coli mutant defective in DNA replication: dnaA, a new gene adjacent to the dnA, gene. Molec. gen. Genet. 178, 541–553 (1980). https://doi.org/10.1007/BF00337859
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DOI: https://doi.org/10.1007/BF00337859