A cross-reactive idiotype, QUPC52 IdX, present on most but not all anti-alpha (1 replaced by 6) dextran-specific IgM and IgA hybridoma antibodies with combining sites of different sizes.
Seven BALB/c IgM, 4 BALB/c IgA, and 1 C57BL/6 IgA anti-alpha (1 replaced by 6) dextran hybridoma antibodies were characterized idiotypically. Five of the 7 IgM and all 4 BALB/c IgA proteins bear a cross-reactive idiotype present on the anti-alpha (1 replaced by 6) dextran BALB/c myeloma protein QUPC52 and on a majority of anti-alpha (1 replaced by 6) dextran antibodies in BALB/c mice. Of these 9 monoclonal antibodies, some have combining sites as large as 6 glucose residues, and some have combining sites as large as 7 glucose residues. Individual idiotypes present on QUPC52 are differentially expressed on the 9 hybridoma proteins that bear the cross-reactive idiotype. One BALB/c IgM hybridoma protein and the C57BL/6 IgA hybridoma protein did not react with anti-QUPC52 idiotypic antibodies; another BALB/c IgM hybridoma antibody showed only marginal reactivity.
D000818:Animals; D001666:Binding Sites, Antibody; D001667:Binding, Competitive; D003429:Cross Reactions; D003911:Dextrans / Q000276:immunology*; D006825:Hybridomas / Q000276:immunology; D007070:Immunoglobulin A / Q000276:immunology; D007130:Immunoglobulin Idiotypes / Q000276:immunology*; D007075:Immunoglobulin M / Q000276:immunology; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D009194:Myeloma Proteins / Q000276:immunology*
D003911:Dextrans; D007070:Immunoglobulin A; D007130:Immunoglobulin Idiotypes; D007075:Immunoglobulin M; D009194:Myeloma Proteins