Hostname: page-component-586b7cd67f-g8jcs Total loading time: 0 Render date: 2024-11-23T10:53:22.806Z Has data issue: false hasContentIssue false

Characteristics of some single-step mutants to chloramphenicol resistance in Escherichia coli K12 and their interactions with R-factor genes

Published online by Cambridge University Press:  14 April 2009

E. C. R. Reeve
Affiliation:
Institute of Animal Genetics, Edinburgh 9
Rights & Permissions [Opens in a new window]

Extract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

Six one-step Chloramphenicol (Cm)-resistant mutants of Escherichia coli K12 were graded for resistance to Cm, Tetracycline (Tc) and Puromyein (Pm) by streaking on minimal agar plates containing antibiotic. They fell into at least three distinct groups on the basis of their resistance patterns. One mutant showed increased sensitivity to Pm. Most of the mutants expressed their effect on resistance to Cm and Tc in the presence of R-factors carrying resistance genes for these antibiotics, but one mutant with a relatively high level of resistance to Cm had its resistance effect completely masked in the presence of R-mediated resistance. Similar cases were found among mutants selected for Cm-resistance in another strain of K12.

Type
Short Papers
Copyright
Copyright © Cambridge University Press 1966

References

REFERENCES

Adams, M. H. (1959). Bacteriophages. New York: Interscience Publishers.Google Scholar
Meytstell, E. & Datta, N. (1966). The relation of resistance transfer factors to the F-factor (sex-factor) of Escherichia coli K12. Genet. Res. 7, 134140.Google Scholar
Okamoto, S. & Mizuno, D. (1964). Mechanism of chloramphenicol and tetracycline resistance in Escherichia coli. J. gen. Microbiol. 35, 125133.Google Scholar
Okamoto, S. & Suzuki, Y. (1965). CMoramphenicol-.Dihydrostreptomycin-, and Kanamycin. inactivating enzymes from multiple drug-resistant Escherichia coli carrying Episome ‘R’. Nature, Lond. 208, 13011303.CrossRefGoogle ScholarPubMed
Reeve, E. C. R. & Bishop, J. O. (1965 a). Multi-step resistance to chloramphenicol in RC-stringent Escherichia coli K12—its effect on the induction of RNA synthesis by antibiotics under amino-acid starvation. Genet. Res. 6, 304309.Google Scholar
Reeve, E. C. R. & Bishop, J. O. (1965 b). Variations in resistance to three antibiotics among some single-step mutants to chloramphenicol resistance in a strain of Escherichia coli K12. Genet. Res. 6, 310315.Google Scholar
Watanabe, T. (1963). Infective heredity of multiple drug resistance in bacteria. Bact. Rev. 27, 87114.Google Scholar