The contribution of small cryptic plasmids to the antibiotic resistance of enteropathogenic Escherichia coli E2348/69

Canadian Journal of Microbiology
Cynthia L HandfordJonathan J Dennis

Abstract

Two uncharacterized small cryptic plasmids (SCPs) were isolated from enteropathogenic Escherichia coli strain E2348/69. Genomic DNA sequence analysis of both SCPs indicated that the smaller plasmid, p5217, encoded several mobilization genes, whereas the larger plasmid, p6148, encoded several putative antibiotic resistance determinants. Complementation analysis showed that p6148 encodes functional streptomycin resistance genes but, owing to the presence of several frameshift mutations, a nonfunctional sulfonamide resistance determinant. A plasmid similar to p6148 has previously been shown to confer a slight growth advantage on E. coli. However, we were unable to observe any significant growth advantage in different E. coli strains transformed with p6148. The p6148 DNA sequence is homologous in sequence and arrangement to DNA from other plasmid families, including large conjugative plasmids and SXT integrative and conjugative elements. This study suggests that gene clusters of the sul2-strAB antibiotic resistance genes are widespread and highly transferable, owing to their presence in a wide variety of mobile genetic elements.

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Citations

Mar 16, 2012·Microbial Drug Resistance : MDR : Mechanisms, Epidemiology, and Disease·Sashindran Anantham, Ruth M Hall
Jul 1, 2017·PloS One·Gardênia Márcia Silva Campos MataBeny Spira
Aug 6, 2013·Journal of Bacteriology·Shahista NisaMichael S Donnenberg
Aug 23, 2020·International Journal of Molecular Sciences·Chris R TaittGary J Vora

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