Synthesis of cystine peptides 21-25/70-73 and 35-39/56-59 of the beta-subunit of human choriogonadotropin.
Syntheses of two asymmetrical cystine peptides with the amino acid residues 21-25/70-73 and 35-39/56-59, based on the linear amino acid sequence and the disulfide bond assignment in the beta-subunit of human choriogonadotropin (hCG-beta), are described. S-trityl and S-acetamidomethyl peptide fragments of each cystine peptide were prepared in solution phase and were subjected to oxidation with I2/MeOH to form the disulfide bridge. The cystine peptides were characterized by their amino acid analyses and fast atom bombardment mass spectrometry. Immunological characterization by several homologous radioimmunoassay systems showed that peptide 21-25/70-73 had significant hCG, hCG-beta, and hLH activities while peptide 35-39/56-59 failed to reveal any immunoreactivity.
Department of Biological Sciences, State University of New York, Buffalo.
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D001667:Binding, Competitive; D055598:Chemical Phenomena; D002621:Chemistry; D006063:Chorionic Gonadotropin; D002851:Chromatography, High Pressure Liquid; D003553:Cystine / Q000031:analogs & derivatives; D000939:Epitopes; D006801:Humans
D006063:Chorionic Gonadotropin; D000939:Epitopes; D003553:Cystine