title: Gene cloning and characterization of KdeA, a multidrug efflux pump from Klebsiella pneumoniae.
abstract: We cloned a gene related to multidrug resistance from a drug-resistant Klebsiella pneumoniae strain MGH78578. We designated the gene kdeA, which encodes a protein possessing 12 hydrophobic regions. The deduced amino acid sequence of KdeA is similar to that of MdfA, a well-characterized multidrug efflux pump from Escherichia coli. Introduction of the kdeA gene into cells of the drug-hypersusceptible E. coli strain KAM32 resulted in elevated minimum inhibitory concentrations of chloramphenicol, norfloxacin, acriflavine, and ethidium bromide. We observed elevated energy-dependent ethidium efflux activity with cells carrying kdeA compared with control cells. We also observed expression of kdeA in cells of K. pneumoniae under normal growth conditions.
authors.affiliation: Department of Molecular Microbiology, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Japan.
authors.forename: Yu
authors.initials: Y
authors.lastname: Ping
authors.forename: Wakano
authors.initials: W
authors.lastname: Ogawa
authors.forename: Teruo
authors.initials: T
authors.lastname: Kuroda
authors.forename: Tomofusa
authors.initials: T
authors.lastname: Tsuchiya
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology; D003001:Cloning, Molecular; D003470:Culture Media; D024901:Drug Resistance, Multiple, Bacterial / Q000235:genetics*; D004926:Escherichia coli / Q000187:drug effects / Q000235:genetics; D004996:Ethidium / Q000378:metabolism; D005798:Genes, Bacterial / Q000235:genetics; D007711:Klebsiella pneumoniae / Q000187:drug effects / Q000235:genetics* / Q000378:metabolism*; D008826:Microbial Sensitivity Tests; D020133:Reverse Transcriptase Polymerase Chain Reaction
chemical_list: D000900:Anti-Bacterial Agents; D003470:Culture Media; D004996:Ethidium