PMID:1095565
| Citation |
Westling-Häggström, B and Normark, S (1975) Genetic and physiological analysis of an envB spherelike mutant of Escherichia coli K-12 and characterization of its transductants. J. Bacteriol. 123:75-82 |
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| Abstract |
The envB1 mutation mediating a distorted cell morphology of Escherichia coliK-12 was cotransducible with strA, aroE, aspB, and argG. The mapping data is consistent with a gene location for envB around 62.5 min. In partial diploids envB1 was recessive to its wild-type allele. The original envB mutant contained a second mutation in a locus denoted sloB close to strA. The following gene order is suggested: sloB-strA-aroE-envB-aspB-argG. The sloB1 mutation caused a marked reduction in the growth rate of both envB and envB+ strains. Moreover, this mutation in the presence of envB1 appears to increase the ratio between deoxyribonucleic acid and protein in cells growing in rich medium. The phenotypic properties of envB1, sloB+ and envB+ transductants were characterized. Cells with envB1, sloB+ genotype were hypersensitive to several penicillins including the beta-lactam compound, amidino penicillin. Penicillin hypersensitivity could not be explained by increased outer membrane penetrability. The original envB mutant (envB1,SLOB1), as well as envB1, sloB1 or envB+, SLOB1 transductants were resistant to amidino penicillin. Resistance was explained by the slow growth rate mediated by the sloB1 mutation. The similarity between envB cells and wild-type cells treated with sublethal concentrations of amidino penicillin was emphasized. |
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| Keywords |
Bacterial Proteins/analysis; Chromosome Mapping; DNA, Bacterial/analysis; Escherichia coli/drug effects; Escherichia coli/metabolism; Escherichia coli/radiation effects; Genes, Recessive; Mutation; Penicillin Resistance; Penicillins/pharmacology; Phenotype; Radiation Effects; Transduction, Genetic; Ultraviolet Rays |
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