title: Characterization of immunologically active cyanogen bromide peptide fragments of bovine and human retinal S-antigen.
abstract: Peptides which account for most, if not all, of the cyanogen bromide (CNBr)-generated peptide fragments of bovine retinal S-antigen have been identified and examined for their immunoreactivity with antisera raised to bovine and human S-antigen and with immune lymphocytes further selected twice in vitro with either bovine or human S-antigen. Amino-acid sequencing of a large fragment of S-antigen missing a small N-terminal peptide revealed the location of three overlapping CNBr peptides near the N-terminus. Amino-acid sequencing of several other CNBr peptides has allowed their position in a partial DNA-predicted sequence of the carboxy terminal half of the antigen to be determined. The total CNBr digest of human S-antigen was also prepared and compared with the fragments of the bovine antigen. Sera from rats immunized with bovine or human S-antigen were similar in their specificity in the enzyme-linked immunosorbent assay (ELISA) for purified bovine peptides except for the CB21 peptide which was not significantly bound by anti-human S-antigen sera. All of the other bovine peptides recognized by anti-bovine S-antigen sera were also bound by antibodies in the sera raised to the human antigen. The CNBr peptides of human and bovine S-antigen were extracted from gel slices and also assayed in the ELISA. Peptides of bovine S-antigen purified by HPLC were tested for their ability to stimulate an in vitro proliferative response in lymphocytes from Lewis rats immunized with either bovine or human S-antigen. Only quantitative differences in the proliferative response to human vs. bovine S-antigen and CNBr peptides were found. Methodology for the purification and analysis of the peptides is presented as well as the properties of the peptides.
mesh_terms: D000595:Amino Acid Sequence; D000596:Amino Acids / Q000032:analysis; D000818:Animals; D000941:Antigens / Q000032:analysis*; D019393:Arrestin; D002417:Cattle; D002851:Chromatography, High Pressure Liquid; D003488:Cyanogen Bromide; D004591:Electrophoresis, Polyacrylamide Gel; D004797:Enzyme-Linked Immunosorbent Assay; D000939:Epitopes / Q000032:analysis; D005136:Eye Proteins / Q000032:analysis*; D005260:Female; D006801:Humans; D008213:Lymphocyte Activation; D008970:Molecular Weight; D010446:Peptide Fragments / Q000276:immunology / Q000302:isolation & purification*; D051381:Rats; D011917:Rats, Inbred Lew; D012160:Retina / Q000276:immunology
chemical_list: D000596:Amino Acids; D000941:Antigens; D019393:Arrestin; D000939:Epitopes; D005136:Eye Proteins; D010446:Peptide Fragments; D003488:Cyanogen Bromide