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. 1970 Apr;102(1):106–117. doi: 10.1128/jb.102.1.106-117.1970

Thymineless Death in Escherichia coli: Deoxyribonucleic Acid Replication and the Immune State

Donald J Cummings 1, Alvin R Kusy 1
PMCID: PMC284975  PMID: 4908667

Abstract

Thymineless death (TLD) and nalidixic acid (NA) inactivation were studied in multiple auxotrophic strains of Escherichia coli B and B/r. As expected, it was found that both E. coli B and B/r exhibited an “immune state,” i.e., a fraction of the population survived inactivation to both TLD and NA. With glucose as a carbon source in minimal medium, 0.1 to 0.3% of strain B and 0.2 to 0.5% of strain B/r survived inactivation; with acetate as the carbon source, the surviving fractions were increased to 1 to 2% and 5 to 7%, respectively. These immune fractions could be increased in magnitude by preincubation in minimal media containing thymine. Systematic analysis of the particular supplements necessary for the immune state indicated that the absence of the required amino acids was essential for the maximal expression of immunity. However, immunity was not abolished in acetate medium even in the presence of the required supplements. Further studies on the replication of deoxyribonucleic acid (DNA) during preincubation indicated that the degree of immunity did not necessarily correlate with the completion of a round of DNA replication. This finding was supported by examining the immune state in synchronous populations. In both glucose and acetate medium, there was no significant change in the degree of immunity to inactivation within the cell cycles of E. coli B and B/r. We concluded that some other event, possibly inhibition of protein synthesis, was necessary in determining the degree of the immune state. DNA replication was investigated after TLD and NA inactivation, and, as expected, it was found that both events led to premature initiation of replication. The only differences observed in the effects of these two processes on DNA synthesis were the following. (i) NA-induced replication was less sensitive to chloramphenicol than was TLD. (ii) TLD-induced replication was unaffected by pretreatment of the cells with mitomycin C, but this pretreatment prevented the replication of DNA after NA treatment. It was suggested that the mechanism of action of NA could involve a monofunctional attack on the DNA.

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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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