title: Flavone and isoflavone phytoestrogens are agonists of estrogen-related receptors.
abstract: While estrogen-related receptors (ERRalpha, ERRbeta, and ERRgamma) share a high amino acid sequence homology with estrogen receptors (ERs), estrogens are not ligands of ERRs. Structure-function studies from this and other laboratories have revealed that ERRs have small ligand-binding pockets and have provided evidence to show that these receptors can activate gene transcription in a constitutive manner. To address the question as to whether there is any agonist for ERRs, our laboratory recently performed virtual ligand screening on ERRalpha that predicted flavone and isoflavone phytoestrogens to be ligands of this receptor. Our mammalian cell transfection and mammalian two-hybrid experiments revealed that three isoflavones (genistein, daidzein, and biochanin A) and one flavone (6,3',4'-trihydroxyflavone) behaved as agonists of ERRs. These phytoestrogens induced the activity of ERRalpha at concentrations that are comparable to those for the activation of ERalpha and ERbeta. In this study, we also used the results of ERRalpha ligand-binding site mutant, F232A, to verify our ERRalpha hypothetical computer model. Our recent ERR research has determined for the first time that flavone and isoflavone phytoestrogens are agonists of ERRs. In addition, our studies have demonstrated that an approach that combines structure-based virtual screening and receptor functional assays can identify novel ligands of orphan nuclear receptors.
authors.affiliation: Department of Surgical Research and Division of Information Sciences, Beckman Research Institute of the City of Hope, Duarte, CA 91010, USA.
authors.forename: Masatomo
authors.initials: M
authors.lastname: Suetsugi
authors.forename: Leila
authors.initials: L
authors.lastname: Su
authors.forename: Kimberly
authors.initials: K
authors.lastname: Karlsberg
authors.forename: Yate-Ching
authors.initials: YC
authors.lastname: Yuan
authors.forename: Shiuan
authors.initials: S
authors.lastname: Chen
mesh_terms: D001667:Binding, Competitive; D003198:Computer Simulation; D016208:Databases, Factual; D047309:Flavones; D005419:Flavonoids / Q000737:chemistry / Q000494:pharmacology*; D019833:Genistein / Q000737:chemistry / Q000494:pharmacology; D006367:HeLa Cells; D006801:Humans; D007529:Isoflavones / Q000737:chemistry / Q000494:pharmacology*; D008024:Ligands; D008156:Luciferases / Q000235:genetics / Q000378:metabolism; D008958:Models, Molecular; D015394:Molecular Structure; D048789:Phytoestrogens; D028321:Plant Preparations / Q000737:chemistry / Q000494:pharmacology; D018160:Receptors, Cytoplasmic and Nuclear / Q000819:agonists* / Q000737:chemistry / Q000235:genetics; D011960:Receptors, Estrogen / Q000819:agonists* / Q000737:chemistry / Q000235:genetics; D011993:Recombinant Fusion Proteins / Q000187:drug effects / Q000235:genetics / Q000378:metabolism; D013329:Structure-Activity Relationship; D014162:Transfection; D000097983:ERRalpha Estrogen-Related Receptor
chemical_list: D047309:Flavones; D005419:Flavonoids; D019833:Genistein; D007529:Isoflavones; D008024:Ligands; D008156:Luciferases; D048789:Phytoestrogens; D028321:Plant Preparations; D018160:Receptors, Cytoplasmic and Nuclear; D011960:Receptors, Estrogen; D011993:Recombinant Fusion Proteins; D000097983:ERRalpha Estrogen-Related Receptor; C490918:ESRRB protein, human; C004742:daidzein; C043562:flavone; C004541:biochanin A