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. 1984 Dec;46(3):649–657. doi: 10.1128/iai.46.3.649-657.1984

Conservation of plasmids among Escherichia coli K1 isolates of diverse origins.

A A Mercer, G Morelli, M Heuzenroeder, M Kamke, M Achtman
PMCID: PMC261591  PMID: 6094355

Abstract

Escherichia coli K1 isolates of various O types were previously assigned to different clonal groups. Members of the two clones defined by membrane pattern 9 (MP9) and serotypes O18:K1 and O1:K1 had been found to be very similar to each other. The plasmid contents of these bacteria confirmed this conclusion. Both groups carried a self-transmissible plasmid of the FI incompatibility group that coded for colicin production and a major outer membrane protein called the plasmid-coded protein (PCP). The size of this plasmid varied from 76 to 96 megadaltons, but restriction endonuclease digestion and DNA heteroduplex analysis revealed that these plasmids were highly related. O18:K1 bacteria of MP6 had previously been determined to represent a subclone, related to but different from O18:K1 MP9 bacteria. These MP6 bacteria carried a different, smaller IncFI plasmid which did not code for colicin production or the PCP protein. This smaller plasmid was primarily related to the larger plasmid within the regions of DNA encoding incompatibility, replication, and conjugation. O1:K1 bacteria of MP5 contained other unrelated plasmids in agreement with the previous conclusion that they are unrelated to O1:K1 bacteria of MP9. The bacteria examined had been isolated from two continents over a time span of 38 years, and the results attest to conservative inheritance of plasmids within bacteria of common descent.

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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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