Abstract
Three antisera to myelin basic protein--a rabbit antiserum pool against rat myelin, a rabbit antiserum pool against rat myelin basic protein (MBP), and a monkey antiserum against bovine MBP--were found to contain detectable levels of antibodies that would bind radiolabeled S49 (GSLPQKAQRPQDENG). Strongly encephalitogenic in Lewis rat, S49 is a synthetic peptide representing residues 69-84 of bovine MBP with a deletion of glycine-76 and histidine-77 to make it analogous to rat and guinea pig MBPs. The rabbit antimyelin antiserum and the monkey anti-MBP antiserum contained antibodies directed against a non-sequential determinant that required asparagine 84, the glycine-histidine deletion, and residues 69-71 for maximal activity. S49-reactive antibodies from the rabbit anti-MBP antiserum were directed solely against a sequential determinant comprising residues 69-71, S49-reactive antibodies from all three antisera reacted in liquid phase with purified intact rat, guinea pig, and bovine MBP showing that the determinant is exposed for B cell recognition even in bovine MBP and can serve both as immunogen and reactant.
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