Complete nucleotide sequence of a conjugative IncF plasmid from an Escherichia coli isolate of equine origin containing blaCMY-2 within a novel genetic context.

A bla(CMY-2)-containing conjugative IncF plasmid denoted as pEQ011, previously identified in a multidrug-resistant Escherichia coli isolate of equine origin, was characterized. The plasmid consisted of 85507bp, with 118 predicted open reading frames. This is the first known report demonstrating the association of a bla(CMY-2) gene with an IncF incompatibility-type plasmid backbone. A novel genetic arrangement was identified wherein the bla(CMY-2) resistance gene was proximally flanked by IS1294 along with a partial blc gene located distally and within a yacABC operon.