Biotransformation of Daidzein to Equol by Crude Enzyme from<i>Asaccharobacter celatus</i>AHU1763 Required an Anaerobic Environment

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  • THAWORNKUNO Charin
    Division of Applied Bioscience, Graduate School of Agriculture, Hokkaido University
  • TANAKA Michiko
    Division of Applied Bioscience, Graduate School of Agriculture, Hokkaido University
  • SONE Teruo
    Division of Applied Bioscience, Graduate School of Agriculture, Hokkaido University
  • ASANO Kozo
    Division of Applied Bioscience, Graduate School of Agriculture, Hokkaido University

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  • Biotransformation of Daidzein to Equol by Crude Enzyme from Asaccharobacter celatus AHU1763 Required an Anaerobic Environment

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Asaccharobacter celatus AHU1763 is a Gram-positive, obligate anaerobic, non-spore forming, rod-shaped bacteria that was successfully isolated from rat cecal content. Daizein was converted to equol via dihydrodaidzein by this bacterium. A crude enzyme that converted daidzein to dihydrodaidzein was detected mainly in the culture supernatant. The ability of this enzyme dropped after the culture supernatant was exposed to a normal atmospheric environment for even 5 min. Furthermore, the enzyme responsible for changing dihydrodaidzein to equol was detected mainly in the cell debris, which required anaerobic conditions for its activity.

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