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. 1966 Dec;92(6):1670–1679. doi: 10.1128/jb.92.6.1670-1679.1966

Streptomycin and Infection of Escherichia coli by T6r+ Bacteriophage1

Celia E Freda a, Seymour S Cohen a
PMCID: PMC316247  PMID: 5335031

Abstract

Freda, Celia E. (University of Pennsylvania School of Medicine, Philadelphia), and Seymour S. Cohen. Streptomycin and infection of Escherichia coli by T6r+ bacteriophage. J. Bacteriol. 92:1670–1679. 1966.—The thymineless, histidineless, uracil-less Escherichia coli 15 THU was shown to be sensitive to streptomycin, dying in patterns comparable to that of strain 15 TAU in the presence or absence of the required amino acid histidine. In the absence of histidine, the antibiotic stimulated ribonucleic acid (RNA) synthesis without a detectable inhibition or stimulation of deoxyribonucleic acid (DNA) synthesis. In the presence of streptomycin (40μg/ml) under conditions of multiple infection with T6r+, lysis of THU occurred 1 hr earlier than did the control, having produced about one-third as much DNA and phage as did the control. In the absence of histidine, thereby preventing synthesis of phage DNA, accumulation of virus-induced RNA was similar for about 30 min in control and streptomycin-treated systems. In the presence of the antibiotic, however, the infected cells accumulated about 50 to 70% more RNA than did the control after 90 min. Nevertheless, the turnover of RNA was not detectably affected by streptomycin. The rate of production and final amount of deoxycytidylate hydroxymethylase, as well as the cut off time of synthesis of this enzyme, were scarcely affected by streptomycin. The beginning of DNA synthesis was delayed about 3 to 4 min by the antibiotic. The incorporation of histidine in infected cells was unaffected for 10 min and was only about 10% less than the control at 70 min. Lysozyme production began at about 10 min in control and antibiotic-treated systems, continued at essentially similarly increasing rates for 20 min, but stopped abruptly in the streptomycin-treated cells despite continuing protein synthesis. With the exception of lysozyme, the production of phage-specific polymers in a streptomycin-sensitive bacterium was only slightly affected by the antibiotic.

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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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