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- W1570291627 abstract "This paper further characterizes the estrogen-binding protein we have described in the cytosol of the yeast Saccharomyces cerevisiae. [3H]Estradiol was used as the radioprobe, and specific binding of cytosol fractions was measured by chromatography on Sephadex minicolumns. Other 3H-steroids did not exhibit specific binding. [3H]Estradiol binding was destroyed by treatment with trypsin, but not RNase, DNase, or phospholipase; N-ethylmaleimide substantially decreased the binding. The yeast did not metabolize estradiol added to the medium, and extraction and chromatography of the bound moiety showed it to be unmetabolized estradiol. Scatchard analysis of cytosol from both a and alpha mating types as well as the a/alpha diploid cell revealed similar binding properties: an apparent dissociation constant or Kd(25 degrees) for [3H]estradiol of 1.6-1.8 nM and a maximal binding capacity or Nmax of approximately 2000-2800 fmol/mg of cytosol protein. Gel exclusion chromatography on Sephacryl S-200 and high performance liquid chromatography suggested a Stokes radius of approximately 30 A. Sucrose gradient centrifugation showed a sedimentation coefficient of approximately 5 S, and the complex did not exhibit ionic dependent aggregation. The estrogen binder in S. cerevisiae differed in its steroidal specificities from classical mammalian estrogen receptors in rat uterus. 17 beta-Estradiol was the best competitor, 17 alpha-estradiol had about 5% the activity, and diethylstilbestrol exhibited negligible binding affinity as did tamoxifen, nafoxidine, and the zearalenones. In summary, a high affinity, stereospecific, steroid-selective binding protein has been demonstrated in the cytosol of the simple yeast S. cerevisiae. We speculate that this molecule may represent a primitive hormone receptor system, possibly for an estrogen-like message molecule." @default.
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- W1570291627 date "1984-03-01" @default.
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- W1570291627 title "Characterization of an estrogen-binding protein in the yeast Saccharomyces cerevisiae." @default.
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- W1570291627 doi "https://doi.org/10.1016/s0021-9258(17)43114-0" @default.
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