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• W2116749070 abstract "ABSTRACT Most Aeromonas strains isolated from two European rivers were previously found to be resistant to nalidixic acid. In order to elucidate the mechanism of this resistance, 20 strains of Aeromonas caviae ( n = 10), A. hydrophila ( n = 5), and A. sobria ( n = 5) complexes, including 3 reference strains and 17 environmental isolates, were investigated. Fragments of the gyrA , gyrB , parC , and parE genes encompassing the quinolone resistance-determining regions (QRDRs) were amplified by PCR and sequenced. Results obtained for the six sensitive strains showed that the GyrA, GyrB, ParC, and ParE QRDR fragments of Aeromonas spp. were highly conserved (≥96.1% identity), despite some genetic polymorphism; they were most closely related to those of Vibrio spp., Pseudomonas spp., and members of the family Enterobacteriaceae (72.4 to 97.1% homology). All 14 environmental resistant strains carried a point mutation in the GyrA QRDR at codon 83, leading to the substitution Ser-83→Ile (10 strains) or Ser-83→Arg. In addition, seven strains harbored a mutation in the ParC QRDR either at position 80 (five strains), generating a Ser-80→Ile (three strains) or Ser-80→Arg change, or at position 84, yielding a Glu-84→Lys modification. No amino acid alterations were discovered in the GyrB and ParE QRDRs. Double gyrA-parC missense mutations were associated with higher levels of quinolone resistance compared with the levels associated with single gyrA mutations. The most resistant strains probably had an additional mechanism(s) of resistance, such as decreased accumulation of the drugs. Our data suggest that, in mesophilic Aeromonas spp., as in other gram-negative bacteria, gyrase and topoisomerase IV are the primary and secondary targets for quinolones, respectively." @default.
• W2116749070 created "2016-06-24" @default.
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• W2116749070 date "2002-02-01" @default.
• W2116749070 modified "2023-10-14" @default.
• W2116749070 title "Type II Topoisomerase Quinolone Resistance-Determining Regions of <i>Aeromonas caviae</i> , A. hydrophila, and <i>A. sobria</i> Complexes and Mutations Associated with Quinolone Resistance" @default.
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• W2116749070 doi "https://doi.org/10.1128/aac.46.2.350-359.2002" @default.
• W2116749070 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/127024" @default.
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