title: gyrA and gyrB mutations in quinolone-resistant strains of Escherichia coli.
abstract: The proportion of gyrA and gyrB mutations in quinolone-resistant Escherichia coli strains was examined by introducing cloned wild-type gyrA and gyrB genes. In 25 spontaneous mutants of strain KL16, 13 had gyrA and 12 had gyrB mutations. In eight clinical isolates, five had gyrA mutations and one had a gyrB mutation; mutations in two isolates remained unidentified.
authors.affiliation: Research Laboratories, Dainippon Pharmaceutical Co., Ltd., Osaka, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Nakamura
authors.forename: M
authors.initials: M
authors.lastname: Nakamura
authors.forename: T
authors.initials: T
authors.lastname: Kojima
authors.forename: H
authors.initials: H
authors.lastname: Yoshida
mesh_terms: D004352:Drug Resistance, Microbial; D004926:Escherichia coli / Q000187:drug effects / Q000235:genetics*; D005798:Genes, Bacterial; D009154:Mutation; D010957:Plasmids; D011804:Quinolines / Q000494:pharmacology*
chemical_list: D011804:Quinolines