Identification of a novel dihydrodaidzein racemase essential for biosynthesis of equol from daidzein in Lactococcus sp. strain 20-92.

Equol is metabolized from daidzein, a soy isoflavone, by the gut microflora. In this study, we identified a novel dihydrodaidzein racemase (L-DDRC) that is involved in equol biosynthesis in a lactic acid bacterium, Lactococcus sp. strain 20-92, and confirmed that histidine-tagged recombinant L-DDRC (L-DDRC-His) was able to convert both the (R)- and (S)-enantiomers of dihydrodaidzein to the racemate. Moreover, we showed that recombinant L-DDRC-His was essential for in vitro equol production from daidzein by a recombinant enzyme mixture and that efficient in vitro equol production from daidzein was possible using at least four enzymes, including L-DDRC. We also proposed a model of the metabolic pathway from daidzein to equol in Lactococcus strain 20-92.

Citation

Yoshikazu Shimada, Masayuki Takahashi, Norihiro Miyazawa, Yasuhiro Abiru, Shigeto Uchiyama, Haretsugu Hishigaki. Identification of a novel dihydrodaidzein racemase essential for biosynthesis of equol from daidzein in Lactococcus sp. strain 20-92. Applied and environmental microbiology. 2012 Jul;78(14):4902-7

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PMID: 22582059

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