A Versatile Microbial System for Biosynthesis of Novel Polyphenols with Altered Estrogen Receptor Binding Activity
作者:Joseph A. Chemler、Chin Giaw Lim、John L. Daiss、Mattheos A.G. Koffas
DOI:10.1016/j.chembiol.2010.03.010
日期:2010.4
Isoflavonoids possess enormous potential for human health with potential impact on heart disease and cancer, and some display striking affinities for steroid receptors. Synthesized primarily by legumes, isoflavonoids are present in low and variable abundance within complex mixtures, complicating efforts to assess their clinical potential. To satisfy the need for controlled, efficient, and flexible biosynthesis of isoflavonoids, a three-enzyme system has been constructed in yeast that can convert natural and synthetic flavanones into their corresponding isoflavones in practical quantities. Based on the determination of the substrate requirements of isoflavone synthase, a series of natural and nonnatural isoflavones were prepared and their binding affinities for the human estrogen receptors (ER alpha and ER beta) were determined. Structure activity relationships are suggested based on changes to binding affinities related to small variations on the isoflavone structure.
Synthesis and biological evaluation of isoflavone analogues from Dalbergia oliveri
Mucronulatol 1 and violanone 2 isolated fromDalbergia oliveri Gamble, and the corresponding isoflavone 3 were prepared by ligand coupling reactions involving organolead reagent. Biological studies have shown a significant cytotoxic effect against an HBL100 leukemia cell line only for isoflavan 1 with an IC50 value amounting to 5.7 μM. All the drugs modestly inhibit the in vitro microtubule assembly