Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Enhanced Production of Benzoylformate Reductase in Enterococcus faecalis under Oxidative Stress Established by Natural Electron Carriers

  • Baik, Sang-Ho (Marine Biotechnology Institute, Kamaishi City) ;
  • Cho, Pan-Ki (Doosan R&D Center) ;
  • Kim, Mee-Hae (Department of Food Science and Technology and Institute of Agricultural Science and Technology, Chonbuk National University) ;
  • Yun, Sei-Eok (Department of Food Science and Technology and Institute of Agricultural Science and Technology, Chonbuk National University)
  • Published : 2003.02.01
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Abstract

Enhancement of the production of benzoylformate reductase (BFR) was attempted under oxidative stress established by natural electron carriers. -lipoic acid (LA), flavin adenine dinucleotide (FAD), and ubiquinone (UQ) did not inhibit growth of E. faecalis when their concentrations were as high as $10{\mu}M$, while $H_2O_2$ and methyl viologen ($MV^2+$) inhibited the bacterial growth. BFR activity in the bacterial extract had increased rapidly after 1 h of cultivation after the addition of $4{\mu}M$ of natural electron carriers, and the activity was maintained during further cultivation. BFR activity of the cells treated with the natural electron carriers was $40\%$ higher than that of the control. In the presence of $4{\mu}M\;H_2O_2\;and\;MV^2+$, BFR activity increased, reaching the highest activity at about 5 h cultivation, and then decreased with further cultivation. It seems that natural electron carriers not only stimulate the induction of BFR, but also stabilize the enzyme. BFR was hardly affected by LA, FAD, and UQ, while $H_2O_2\;and\;MV^2+$ inactivated the crude enzyme. The decrease of BFR activity in the presence of $H_2O_2\;and\;MV^2+$ might be ascribed to inactivation of the enzyme by the oxidants.

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