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Genetic and physical characterization of the ColIb plasmid using ColIb-R222 hybrids

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Summary

The presence of the ColIb plasmid in Escherichia coli cells inhibits the growth of bacteriophages BF23 and T5 (Ibf phenotype; inhibition of BF23 and T5 growth). To understand this abortive infection, we devised a method of isolating mutants that were defective in some ColIb phenotypes including Ibf. This method consisted of transduction of the tet (Tcr; tetracycline resistance) or cml (Cmr; chloramphenicol resistance) gene of plasmid R222 with phage P22 into ColIb, construction of TcrCmrIbf+ Imm+ (immunity to colicin Ib) Cib- (no production of colicin Ib) recombinants by crossing between the transductants, and isolation of deletion mutants from the recombinants by phage P1 transduction. By this procedure, pKM25-2 (TcrCmsIbf-Imm-Cib-) and pKM25-1 (TcrCmsIbf+Imm+Cib-) were isolated. Construction of the cleavage map of the ColIb plasmid by restriction endonucleases and comparative analyses of the DNA fragments produced from the mutant plasmids revealed that the genes determining Ibf and Imm mapped on a 4.60 Mdal HindIII fragment (H-3) and the gene determining Cib on a 1.71 Mdal EcoRI fragment (E-12).

These results together with other observations (Wilkins et al. 1981; Hama personal communication) also show the approximate positions of the genes for Rep (replication), Inc (incompatibility), and Sog (suppression of dnaG) as well as Ibf, Imm, and Cib phenotypes on the cleavage map of the ColIb plasmid.

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Communicated by T. Yura

Preliminary data were reported in the 1979 Annual Meeting of the Japan Molecular Biology Society (Uemura and Mizobuchi, Abst Ann Mol Biol Meet 1979, p 36)

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Uemura, H., Mizobuchi, K. Genetic and physical characterization of the ColIb plasmid using ColIb-R222 hybrids. Molec Gen Genet 185, 1–12 (1982). https://doi.org/10.1007/BF00333783

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  • DOI: https://doi.org/10.1007/BF00333783

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