A survey of Col plasmids in natural isolates of Escherichia coli and an investigation into the stability of Col-plasmid lineages (original) (raw)

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Abstract

A survey of colicins in the ECOR reference collection of Escherichia coli is presented. Twenty-five of the 72 ECOR strains exhibited a phenotype consistent with colicin production and E. coli isolated from human hosts were more likely to be colicinogenic than those from animal hosts. Multiple representatives of two Col plasmids, lowmolecular-mass ColE1 plasmids and high-molecular-mass, conjugative ColIa plasmids were isolated from the ECOR collection and were examined with a combination of restriction fragment and Southern analysis. These data suggested that ColE1 plasmids comprise a stable (cohesive) plasmid lineage, while ColIa plasmids represent a family of distinct plasmid lineages united by the presence of the colicin Ia operon.

• Received: 30/09/1991
• Accepted:31/03/1992
• Revised:17/03/1992
• Published Online:01/07/1992

© Society for General Microbiology, 1992

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