title: Synthesis of a disulfide affinity adsorbent for purification of estrogen receptor.
abstract: Synthesis of an estrogen affinity adsorbent containing a disulfide linkage between the steroid and stationary matrix permitted facile purification of high affinity estrogen binding proteins. Following affinity chromatography of either antibody directed against estrone 17-carboxymethyloxime - bovine serum albumin or immature calf uterine cytoplasmic estrogen receptor proteins, the specifically bound mercaptoethanol. Crude antibody and uterine cytosol was 10(-3) to 10(-2)M cystamine (S-S) to block SH-containing proteins, in order to protect the adsorbent against protein-mediated S-S in equilibrium SH exchange. Cystamine was found to markedly stabilize crude cytosol receptor protein by 200-300% compared with preparations obtained under ordinary conditions. Disulfide affinity adsorbents are versatile in that they can be used either under conventional conditions of specific protein recovery, or with 2-mercaptoethanol which removes the ligand and bound protein from the stationary matrix quantitatively.
mesh_terms: D000818:Animals; D001665:Binding Sites; D002417:Cattle; D002846:Chromatography, Affinity / Q000379:methods; D003600:Cytosol / Q000378:metabolism; D004220:Disulfides; D004958:Estradiol / Q000378:metabolism; D005260:Female; D007700:Kinetics; D011485:Protein Binding; D011960:Receptors, Estrogen / Q000302:isolation & purification* / Q000378:metabolism; D013696:Temperature; D014599:Uterus / Q000378:metabolism
chemical_list: D004220:Disulfides; D011960:Receptors, Estrogen; D004958:Estradiol