The effect of biotinylation on the antigenic specificity of anti-defensin monoclonal antibodies.
We studied the effects of biotinylation on three monoclonal antibodies (Mabs) that were raised against carrier protein conjugates of human defensin HNP-1, and of rabbit defensins NP-2 and NP-5 respectively. Before biotinylation, each Mab specifically bound to its peptide hapten. Biotinylation of these Mabs by the N-hydroxysuccinimide-biotin (NHS-biotin) resulted in crossreactivity of each Mab with the two irrelevant defensin peptides. In contrast, Mab specificity was preserved after biotinylation with biotin hydrazide, which links biotin to the glycan moiety of antibodies. The effects of NHS-biotinylation were in part mimicked by 2,4-dinitrofluorobenzene, another agent that modified primary amine groups of proteins, suggesting that this modification contributed to the change in antibody specificity. When a high degree of antigenic specificity against peptide immunogens is required, biotinylation on the glycan moiety of Mabs may be preferable.
Panyutich
A V
AV
Will Rogers Pulmonary Research Laboratory, School of Medicine, University of California, Los Angeles 90024-1736.
Baturevich
E A
EA
Kolesnikova
T S
TS
Ganz
T
T
D000595:Amino Acid Sequence; D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology*; D000918:Antibody Specificity; D000935:Antifungal Agents / Q000276:immunology*; D000937:Antigen-Antibody Reactions; D001710:Biotin / Q000031:analogs & derivatives*; D001798:Blood Proteins / Q000737:chemistry / Q000276:immunology*; D003429:Cross Reactions; D023082:Defensins; D004139:Dinitrofluorobenzene; D004797:Enzyme-Linked Immunosorbent Assay; D000939:Epitopes / Q000276:immunology; D006801:Humans; D006825:Hybridomas; D008969:Molecular Sequence Data; D011817:Rabbits; D017386:Sequence Homology, Amino Acid; D013388:Succinimides; D023084:alpha-Defensins
D000911:Antibodies, Monoclonal; D000935:Antifungal Agents; D001798:Blood Proteins; D023082:Defensins; D000939:Epitopes; D013388:Succinimides; D023084:alpha-Defensins; C033788:biotinyl N-hydroxysuccinimide ester; C406413:human neutrophil peptide 1; C053311:biotin hydrazide; D001710:Biotin; D004139:Dinitrofluorobenzene