BMB Reports

생화학분자생물학회 (Korean Society for Biochemistry and Molecular Biology)
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Control of Singlet Oxygen-induced Oxidative Damage in Escherichia coli

  • Kim, Sun-Yee (Department of Biochemistry, College of Natural Sciences, Kyungpook National University) ;
  • Kim, Eun-Ju (Department of Biochemistry, College of Natural Sciences, Kyungpook National University) ;
  • Park, Jeen-Woo (Department of Biochemistry, College of Natural Sciences, Kyungpook National University)
  • 발행 : 2002.07.31
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초록

Singlet oxygen ($^1O_2$) is highly reactive form of molecular oxygen that may harm living systems by oxidizing critical cellular macromolecules. The oxyR gene product regulates the expression of the enzymes and proteins that are needed for cellular protection against oxidative stress. In this study, the role of oxyR in cellular defense against a singlet oxygen was investigated using Escherichia coli oxyR mutant strains. Upon exposure to methylene blue and visible light, which generates singlet oxygen, the oxyR overexpression mutant was much more resistant to singlet oxygen-mediated cellular damage when compared to the oxyR deletion mutant in regard to growth kinetics, viability and protein oxidation. Induction and inactivation of major antioxidant enzymes, such as superoxide desmutase and catalase, were observed after their exposure to a singlet oxygen generating system in both oxyR strains. However, the oxyR overexpression mutant maintained significantly higher activities of anticxidant enzymes than did the oxyR deletion mutant. These results suggest that the oxyR regulon plays an important protective role in singlet oxygen-mediated cellular damage, presumably through the protection of antioxidant enzymes.

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참고문헌

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