Abstract
Diethylstilbestrol was coupled to epoxy-activated agarose yielding an affinity resin which is highly efficient for the isolation of estrogen receptors. This resin, diethylstilbestrol-agarose (DES-agarose), bound two proteins ( M r = 50,000 and 65,000) from rabbit uterine cytosol that show a specific interaction with estradiol. A two step procedure—adsorption on DES-agarose followed by a selective elution with p-sec-amylphenol and NaSCN, yielded highly purified estrogen receptors which can be used in the studies of estradiol-receptor interactions with other cell constituents.
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