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. 1972 May;110(2):667–676. doi: 10.1128/jb.110.2.667-676.1972

Nature of Col E1 Plasmid Replication in Escherichia coli in the Presence of Chloramphenicol

Don B Clewell 1
PMCID: PMC247463  PMID: 4336693

Abstract

The colicinogenic factor E1 (Col E1) in Escherichia coli continues to replicate by a semiconservative mechanism in the presence of chloramphenicol (CAP) for 10 to 15 hr, long after chromosomal deoxyribonucleic acid (DNA) synthesis has terminated. Following CAP addition, the rate of synthesis of plasmid DNA gradually increases to an extent dependent on the medium employed. Within 2 to 4 hr after the addition of CAP, replication in a glucose-Casamino Acids medium approaches a maximum rate representing approximately eight times an average rate which would be required for a net doubling of DNA per cell in one generation. The number of copies of Col E1 DNA molecules that accumulate under these conditions approaches about 3,000 copies per cell, representing a 125-fold increase over the normal level of 24 copies per cell. The system is particularly convenient for studying the mechanism of DNA replication.

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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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