Abstract:
:Equol is a metabolite produced in vivo from the soy phytoestrogen daidzein by the action of gut microflora. It is known to be estrogenic, so human exposure to equol could have significant biological effects. Equol is a chiral molecule that can exist as the enantiomers R-equol and S-equol. To study the biological activity of racemic (+/-)-equol, as well as that of its pure enantiomers, we developed an efficient and convenient method to prepare (+/-)-equol from available isoflavanoid precursors. Furthermore, we optimized a method to separate the enantiomers of equol by chiral HPLC, and we studied for the first time, the activities of the enantiomers on the two estrogen receptors, ERalpha and ERbeta. In binding assays, S-equol has a high binding affinity, preferential for ERbeta (K(i)[ERbeta]=16 nM; beta/alpha=13 fold), that is comparable to that of genistein (K(i)[ERbeta]=6.7 nM; beta/alpha=16), whereas R-equol binds more weakly and with a preference for ERalpha (K(i)[ERalpha]=50 nM; beta/alpha=0.29). All equol isomers have higher affinity for both ERs than does the biosynthetic precursor daidzein. The availability and the in vitro characterization of the equol enantiomers should enable their biological effects to be studied in detail.
journal_name
Bioorg Med Chemjournal_title
Bioorganic & medicinal chemistryauthors
Muthyala RS,Ju YH,Sheng S,Williams LD,Doerge DR,Katzenellenbogen BS,Helferich WG,Katzenellenbogen JAdoi
10.1016/j.bmc.2003.11.035subject
Has Abstractpub_date
2004-03-15 00:00:00pages
1559-67issue
6eissn
0968-0896issn
1464-3391pii
S0968089604000239journal_volume
12pub_type
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