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. 1978 Dec;136(3):994–1001. doi: 10.1128/jb.136.3.994-1001.1978

Kasugamycin-dependent mutants of Escherichia coli.

E R Dabbs
PMCID: PMC218535  PMID: 363701

Abstract

Kasugamycin-dependent mutants have been isolated from Escherichia coli B. They were obtained through mutagenesis with ethyl methane sulfonate or nitrosoguanidine in conjunction with an antibiotic underlay technique. In the case of nitrosoguanidine, dependent mutants were obtained at a frequency of about 3% of survivors growing up in the selection. In the case of ethyl methane sulfonate, the corresponding value was 1%. Nineteen mutants showing a kasugamycin-dependent phenotype were studied. In terms of response to various temperatures and antibiotic concentrations, they were very heterogeneous, although most fell into two general classes. Genetic analysis indicated that in at least some cases, the kasugamycin-dependent phenotype was the product of two mutations. Two-dimensional gel electropherograms revealed alterations in the ribosomal proteins of seven mutants. One mutant had an alteration in protein S13, and one had an alteration in protein L14. Three showed changes in protein S9. Each of two mutants had changes in two proteins, S18 and L11. Three of these mutants additionally had protein S18 occurring in a partly altered, partly unaltered form.

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Selected References

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