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Comparative Study
. 1991 Aug;35(8):1647-50.
doi: 10.1128/AAC.35.8.1647.

Quinolone resistance-determining region in the DNA gyrase gyrB gene of Escherichia coli

H Yoshida  1 , M Bogaki, M Nakamura, L M Yamanaka, S Nakamura
Affiliations
Comparative Study

Quinolone resistance-determining region in the DNA gyrase gyrB gene of Escherichia coli

H Yoshida et al. Antimicrob Agents Chemother. 1991 Aug.

Abstract

Thirteen spontaneous quinolone-resistant gyrB mutants of Escherichia coli KL16, including two that were examined previously, were divided into two types according to their quinolone resistance patterns. Type 1 mutants were resistant to all the quinolones tested, while type 2 mutants were resistant to acidic quinolones and were hypersusceptible to amphoteric quinolones. Nucleotide sequence analysis disclosed that all nine type 1 mutants had a point mutation from aspartic acid to asparagine at amino acid 426 and that all four type 2 mutants had a point mutation from lysine to glutamic acid at amino acid 447.

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