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- W2035143736 abstract "Crude plasma membranes of pseudopregnant rat ovaries were incubated with 125I-labeled human chorionic gonadotropin (125I-hCG) and the formed luteinizing hormone (LH)/hCG receptor-125I-hCG complex was solubilized, partially purified by Sepharose 6B gel filtration, cross-linked with glutaraldehyde and subjected to sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) and fluorography. An apparent molecular weight (mol wt) of 130,000 was obtained for the non-reduced complex. A similar-sized complex was observed, when 3H-hCG (β-subunit labeled) instead of 125I-hCG (α-subunit labeled) was used, indicating that the complex contains intact hCG. Upon reduction of the cross-linked receptor-125I-hCG complex, a 105,000 mol wt complex in addition to the 130,000 one was observed. No smaller complexes appeared, however, upon reduction of the receptor-3H-hCG complex, suggesting that the α-subunit of hCG predominantly interacts with the receptor. The cross-linking efficiency was dependent on protein concentration, glutaraldehyde concentration, pH, reaction time and temperature. Under optimal conditions (2 mM glutaraldehyde, pH 7.0-8.0, 60 min, 20°C) no nonspecific complexes appeared and the efficiency of cross-linking of the partially purified detergent-solubilized receptor-125I-hCG complex was approximately 30%. Glutaraldehyde thus provides a rapid and efficient cross-linking reagent to covalently attach 125I-hCG to its receptor and is likely to be highly applicaple to other receptor-ligand systems as well." @default.
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- W2035143736 date "1987-01-01" @default.
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- W2035143736 title "Covalent Cross-Linking of Radiolabeled Human Chorionic Gonadotropin to Rat Ovarian Luteinizing Hormone Receptor with Glutaraldehyde" @default.
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- W2035143736 doi "https://doi.org/10.3109/10799898709054563" @default.
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