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. 1970 May;19(5):707–713. doi: 10.1128/am.19.5.707-713.1970

Effect of Chloramphenicol on Host-Bacteriophage Relationships in the Lactic Streptococci

J M Erskine 1,1
PMCID: PMC376773  PMID: 5422302

Abstract

Chloramphenicol (CM)-resistant mutants of Streptococcus lactis strain ML3 were obtained either as a consequence of continuous transfer of the bacteria in broth containing increasing amounts of CM or by selecting for high-level resistant derivatives after mutagenic treatment of the bacteria. Some CM-resistant cells obtained by the first method were also resistant to the homologous bacteriophage. Cells trained to grow in the presence of CM developed resistance to some heterologous attacking phages but not to phage ml3. Mutants selected for phage resistance were not resistant to CM. There appear to be two different loci for CM resistance on the bacterial chromosome: the one for high-level resistance is associated with the phage-resistance locus and the other is independent of it. A concentration of CM (280 μg/ml) that was bacteriostatic for ML3 inhibited the intracellular growth of ml3 phage in strain ML3-CMrI, which had been trained to grow in the presence of that CM concentration, despite the fact that cells of this strain were not phage-resistant per se. The drug had no direct virucidal action and did not prevent adsorption to or penetration of phage into the bacterium. Lysogenization did not occur. It is concluded that the block in phage development probably involves inhibition of synthesis of phage components, either involving deoxyribonucleic acid at an early stage or the phage coat protein at a later one.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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