Application of recombinant lactic acid bacteria and bifidobacteria able to enrich soy beverage in dihydrodaidzein and dihydrogenistein

Food Research International
Ángela PeiroténJosé Mª Landete

Abstract

Dihydrodaidzein (DHD) and dihydrogenistein (DHG) are intermediate compounds in the production of equol and 5-hydroxy-equol from daidzein and genistein by certain intestinal bacteria. In this work, we explored the heterologous expression of the daidzein reductase gene from Slackia isoflavoniconvertens DSM22006, responsible for the formation of DHD and DHG, in nine lactic acid bacteria and Bifidobacterium strains under a strong constitutive promoter in the plasmid pNZ:TuR.dzr. All the transformed strains showed high production of DHD and DHG both from pure daidzein and genistein and from the isoflavone glycosides present in soy beverage. In addition, Lactococcus lactis MG1363 pNZ:TuR.dzr, expressing the recombinant daidzein reductase, incremented the production of equol by equol-producing intestinal microbiotas in a colonic environment. Nevertheless, other recombinant strains tested showed the opposite effect to L. lactis MG1363 pNZ:TuR.dzr in the production of equol by intestinal microbiota. Here, we describe for the first time the production of 5-hydroxy-equol by human intestinal microbiota, both from genistein and DHG. The use of DHD and DHG as substrates, compared to daidzein and genistein, resulted in an increment of equol a...Continue Reading

Citations

Jul 21, 2021·International Journal of Food Microbiology·Ana Ruiz de la BastidaJosé María Landete
Jun 27, 2021·FEMS Microbiology Letters·Lucía VázquezBaltasar Mayo
Sep 19, 2021·Applied Microbiology and Biotechnology·Susana LangaJosé María Landete

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