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. 1974 Aug;119(2):450–460. doi: 10.1128/jb.119.2.450-460.1974

Effect of Inhibitors of Ribonucleic Acid and Protein Synthesis on the Cyclic Adenosine Monophosphate Stimulation of Plasmid ColE1 Replication

Leonard Katz a,1, D R Helinski a
PMCID: PMC245627  PMID: 4368626

Abstract

Addition of cyclic adenosine 3′-5′-monophosphate (c-AMP) to growing Escherichia coli cells, colicinogenic for the plasmid ColE1, results in a fourfold stimulation in the rate of synthesis of the plasmid deoxyribonucleic acid (DNA). The stimulation is transient (30 min) and is succeeded by a brief period (30 min) of cessation of plasmid DNA replication. The stimulation of ColE1 DNA replication also occurs in chloramphenicol-treated cells. Rifampin inhibits ColE1 DNA replication in the presence or absence of c-AMP. Employing thymine starvation conditions to stop ColE1 DNA synthesis, it was found that c-AMP, added during the period of thymine starvation, effected a stimulation in the amount of subsequent replication which took place when replicating conditions were restored. The stimulatory effect of c-AMP under these conditions was not prevented by chloramphenicol but was completely eliminated when rifampin was present. Under these conditions, when rifampin was added after the effect of c-AMP was allowed to occur, subsequent replication of the plasmid could take place, but only one round of replication occurred. A model to account for the c-AMP effects is presented.

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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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