title: Antigenicity of topochemically related peptides.
abstract: Antibodies raised in rabbits against multimeric all-L peptides (MAP's) were first made monospecific by affinity chromatography on immobilized antigen columns and then tested for their ability to cross-react with topologically related variants of the parent antigen, where the chirality of each amino-acid residue (inverso derivatives), or the peptide sequence orientation (retro derivatives), was inverted, or where both modifications were simultaneously introduced (retro-inverso derivatives). Retro, inverso, and retro-inverso forms of the parent peptide were prepared, both in the linear as well as in the BSA-conjugated form, and found to cross-react to a significant extent with affinity purified polyclonal antibodies raised against the parent peptide. Peptide variants displayed similar dose-dependent inhibitory effects on the interaction between immobilized parent antigen and affinity purified antibodies. Analysis of molecular models of the peptide variants in the trans-configuration suggested that the topological equivalence of alternating side chains in the series of related peptides may be responsible for the observed cross-recognition, leading to the formation of similar recognition surfaces which could mimic the parent peptide antigenic structure.
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000906:Antibodies / Q000276:immunology; D000937:Antigen-Antibody Reactions; D000941:Antigens / Q000737:chemistry / Q000276:immunology*; D001667:Binding, Competitive; D002846:Chromatography, Affinity; D003429:Cross Reactions / Q000276:immunology; D004797:Enzyme-Linked Immunosorbent Assay; D000939:Epitopes / Q000737:chemistry / Q000276:immunology; D007140:Immunoglobulin Fab Fragments / Q000276:immunology; D008958:Models, Molecular; D008969:Molecular Sequence Data; D010455:Peptides / Q000737:chemistry* / Q000276:immunology*; D011485:Protein Binding; D011817:Rabbits; D012710:Serum Albumin, Bovine; D013237:Stereoisomerism
chemical_list: D000906:Antibodies; D000941:Antigens; D000939:Epitopes; D007140:Immunoglobulin Fab Fragments; D010455:Peptides; D012710:Serum Albumin, Bovine