An antigenic determinant common to human chorionic somatomammotropin and human growth hormone revealed by limited proteolysis of immune complexes.
An epitope of human chorionic somatomammotropin for one of the monoclonal antibodies raised against the whole antigen has been identified. We compared the release of peptides from limited proteolysis of the antigen in the presence and absence of the related antibody. Using enzymes of different specificity, we could determine the amino acid sequence that can be considered at least inclusive of the epitope. The monoclonal antibody selected is 100% cross-reactive with human growth hormone, so the antigenic determinant identified is shared by the two protein hormones.
Santucci
A
A
Dipartimento di Biologia Molecolare, Universitá di Siena, Italy.
Rustici
M
M
Bracci
L
L
Neri
P
P
D000595:Amino Acid Sequence; D000911:Antibodies, Monoclonal / Q000276:immunology; D000936:Antigen-Antibody Complex / Q000378:metabolism*; D002851:Chromatography, High Pressure Liquid; D000939:Epitopes / Q000276:immunology*; D013006:Growth Hormone / Q000276:immunology* / Q000378:metabolism; D008969:Molecular Sequence Data; D010447:Peptide Hydrolases; D010928:Placental Lactogen / Q000276:immunology* / Q000378:metabolism
D000911:Antibodies, Monoclonal; D000936:Antigen-Antibody Complex; D000939:Epitopes; D013006:Growth Hormone; D010928:Placental Lactogen; D010447:Peptide Hydrolases