Characterization of florfenicol resistance among calf pathogenic Escherichia coli

Three floR genes were cloned from calf pathogenic Escherichia coli strains, and the efflux-mediated accumulation of florfenicol in the floR gene-JM109 E. coli system was determined by HPLC. The floR genes resulted in a 1356-bp fragment covering the ORF in region 66–1280 coding for 404 amino acids. T...

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Veröffentlicht in:FEMS microbiology letters 2004-07, Vol.236 (2), p.183-189
Hauptverfasser: Du, Xiangdang, Xia, Chun, Shen, Jianzhong, Wu, Beibei, Shen, Zhangqi
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Sprache:eng
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Zusammenfassung:Three floR genes were cloned from calf pathogenic Escherichia coli strains, and the efflux-mediated accumulation of florfenicol in the floR gene-JM109 E. coli system was determined by HPLC. The floR genes resulted in a 1356-bp fragment covering the ORF in region 66–1280 coding for 404 amino acids. The common motifs of 12-transmembrane segments efflux pumps family were conserved in the deduced floR amino acid sequences. HPLC results indicated a significant difference in florfenicol accumulation between florfenicol-resistant strains and the susceptible strains, which was almost reversed by the addition of a proton motive force blocker. These results suggest that the florfenicol resistance mediated by the floR gene involves active efflux of florfenicol.
ISSN:0378-1097
1574-6968
DOI:10.1016/j.femsle.2004.05.013