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Korean Society for Biochemistry and Molecular Biology (생화학분자생물학회)
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Cleavable Complex Formation as a Major Cellular Process in the Antibacterial Action of Quinolones

  • Park, Ji-Soo (Department of Biochemistry, College of Science, Yonsei University) ;
  • Park, Sang-Hee (Department of Biology, Seoul Woman's University) ;
  • Lee, Yeon-Hee (Department of Biology, Seoul Woman's University) ;
  • Kong, Jae-Yang (Research Institute of Chemical Technology) ;
  • Kim, Wan-Joo (Research Institute of Chemical Technology) ;
  • Koo, Hyeon-Sook (Department of Biochemistry, College of Science, Yonsei University)
  • Received : 1995.06.22
  • Published : 1995.09.30
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Abstract

Quinolone antibiotics are DNA gyrase inhibitors, but their bactericidal action seems to involve more than the inhibition of DNA gyrase activity. Hence, the potentially crucial factors among possible mechanisms of quinolone action; cleavable complex formation, inhibition of DNA synthesis, and induction of SOS response were investigated. These parameters were measured in an Escherichia coli strain exposed to quinolones in the logarithmic growth phase, and correlated with the bactericidal activity of quinolones. Cleavable complex formation proved to be the factor most related to bactericidal action. Inhibition of DNA synthesis was substantially correlated with bactericidal activity, but induction of SOS response was least correlated with bactericidal activity. Therefore, it was concluded that quinolones exert bactericidal action primarily through cleavable complex formation, and subsequent unknown cellular processes together with inhibition of DNA synthesis contribute to the bactericidal activity of quinolones.

Keywords

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