Molecular Cloning of the DNA Gyrase Genes from Methylovorus Sp. Strain SS1 and the Mechanism of Intrinsic Quinolone Resistance in Methylotrophic Bacteria

  • Kim, Kwang-Seo (Department of Plant and Microbial Biology, University of California-Berkeley) ;
  • Kim, Jeong Hoon (Department of Pathology, University of Southern California) ;
  • Kim, Do Yeob (Molecular Microbiology Laboratory, Department of Biology, Yonsei University) ;
  • Kim, Hyun Jong (Department of Cell and Developmental Biology, Rutgers University, Nelson Biology Laboratories) ;
  • Park, Sang Tae (Children's Hospital Boston, Harvard Medical School) ;
  • Kim, Young Min (Molecular Microbiology Laboratory, Department of Biology, Yonsei University)
  • Received : 2005.07.15
  • Accepted : 2005.09.03
  • Published : 2005.12.31

Abstract

The genes encoding the DNA gyrase A (GyrA) and B subunits (GyrB) of Methylovorus sp. strain SS1 were cloned and sequenced. gyrA and gyrB coded for proteins of 846 and 799 amino acids with calculated molecular weights of 94,328 and 88,714, respectively, and complemented Escherichia coli gyrA and gyrB temperature sensitive (ts) mutants. To analyze the role of type II topoisomerases in the intrinsic quinolone resistance of methylotrophic bacteria, the sequences of the quinolone resistance-determining regions (QRDRs) in the A subunit of DNA gyrase and the C subunit (ParC) of topoisomerase IV (Topo IV) of Methylovorus sp. strain SS1, Methylobacterium extorquens AM1 NCIB 9133, Methylobacillus sp, strain SK1 DSM 8269, and Methylophilus methylotrophus NCIB 10515 were determined. The deduced amino acid sequences of the QRDRs of the ParCs in the four methylotrophic bacteria were identical to that of E. coli ParC. The sequences of the QRDR in GyrA were also identical to those in E. coli GyrA except for the amino acids at positions 83, 87, or 95. The $Ser^{83}$ to Thr substitution in Methylovorus sp. strain SS1, and the $Ser^{83}$ to Leu and $Asp^{87}$ to Asn substitutions in the three other methylotrophs, agreed well with the minimal inhibitory concentrations of quinolones in the four bacteria, suggesting that these residues play a role in the intrinsic susceptibility of methylotrophic bacteria to quinolones.

Keywords

gyrA;gyrB;Gyrase Genes;Methylotrophic Bacteria;Methylovorus Sp. Strain SS1;Quinolone Resistance

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