Microbial resistance in relation to catalase activity to oxidative stress induced by photolysis of hydrogen peroxide

Keisuke Nakamura, Taro Kanno, Takayuki Mokudai, Atsuo Iwasawa, Yoshimi Niwano, Masahiro Kohno

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

The purpose of the present study was to evaluate the mechanism of microbial resistance to oxidative stress induced by photolysis of hydrogen peroxide (H 2O 2) in relation to microbial catalase activity. In microbicidal tests, Staphylococcus aureus and Candida albicans were killed and this was accompanied by production of hydroxyl radicals. C. albicans was more resistant to hydroxyl radicals generated by photolysis of H 2O 2 than was S. aureus. A catalase activity assay demonstrated that C. albicans had stronger catalase activity; accordingly, catalase activity could be one of the reasons for the resistance of the fungus to photolysis of H 2O 2. Indeed, it was demonstrated that C. albicans with strong catalase activity was more resistant to photolysis of H 2O 2 than that with weak catalase activity. Kinetic analysis using a modified Lineweaver-Burk plot also demonstrated that the microorganisms reacted directly with hydroxyl radicals and that this was accompanied by decomposition of H 2O 2. The results of the present study suggest that the microbicidal effects of hydroxyl radicals generated by photolysis of H 2O 2 can be alleviated by decomposition of H 2O 2 by catalase in microorganisms.

Original languageEnglish
Pages (from-to)48-55
Number of pages8
JournalMICROBIOLOGY and IMMUNOLOGY
Volume56
Issue number1
DOIs
Publication statusPublished - 2012 Jan 1

Keywords

  • Catalase
  • Hydrogen peroxide
  • Hydroxyl radical
  • Photolysis

ASJC Scopus subject areas

  • Microbiology
  • Immunology
  • Virology

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