期刊
APPLIED AND ENVIRONMENTAL MICROBIOLOGY
卷 78, 期 14, 页码 4902-4907出版社
AMER SOC MICROBIOLOGY
DOI: 10.1128/AEM.00410-12
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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 dihydro-daidzein 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.
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