title: DNA cloning and organization of the Staphylococcus aureus gyrA and gyrB genes: close homology among gyrase proteins and implications for 4-quinolone action and resistance.
abstract: Staphylococcus aureus gyrA and gyrB genes, which encode the DNA gyrase A and B proteins, have been isolated and found to map contiguously. DNA sequence analysis revealed close homology between the S. aureus gyrase subunits and their counterparts in Bacillus subtilis and Escherichia coli, including several conserved amino acid residues whose substitution in E. coli confers resistance to 4-quinolones. These results are discussed in regard to quinolone resistance mechanisms in S. aureus.
authors.affiliation: Department of Cellular and Molecular Sciences, St. George's Hospital Medical School, University of London, United Kingdom.
authors.forename: R
authors.initials: R
authors.lastname: Hopewell
authors.forename: M
authors.initials: M
authors.lastname: Oram
authors.forename: R
authors.initials: R
authors.lastname: Briesewitz
authors.forename: L M
authors.initials: LM
authors.lastname: Fisher
mesh_terms: D000595:Amino Acid Sequence; D003001:Cloning, Molecular; D004250:DNA Topoisomerases, Type II / Q000235:genetics*; D004269:DNA, Bacterial / Q000032:analysis*; D004352:Drug Resistance, Microbial / Q000235:genetics; D005798:Genes, Bacterial; D008969:Molecular Sequence Data; D015363:Quinolones / Q000494:pharmacology*; D013211:Staphylococcus aureus / Q000187:drug effects / Q000235:genetics*
chemical_list: D004269:DNA, Bacterial; D015363:Quinolones; D004250:DNA Topoisomerases, Type II