title: Anti-flavin antibodies.
abstract: Antibodies were elicited to FAD by using the hapten N-6-(6-aminohexyl)-FAD conjugated to the immunogenic carrier protein bovine serum albumin. Cross-reactivity was determined by Ouchterlony double-diffusion analysis with N-6-(6-aminohexyl)-FAD coupled to rabbit serum albumin. Anti-FAD IgG was partially purified by (NH4)2SO4 precipitation followed by DEAE-cellulose/CM-cellulose and bovine serum albumin-agarose chromatography. The partially purified anti-FAD IgG fraction failed to inhibit the catalytic activities of the flavin-containing enzymes nitrate reductase, xanthine oxidase and succinate dehydrogenase, whereas enzyme activity could be inhibited by addition of antibodies elicited against the native proteins. However, the partially purified anti-FAD IgG fraction could be used as a highly sensitive and specific probe to detect proteins containing only covalently bound flavin, such as succinate dehydrogenase, p-cresol methylhydroxylase and monoamine oxidase, by immuno-blotting techniques. Detection limits were estimated to be of the order of femtomolar concentrations of FAD with increased sensitivity for the 8 alpha-N(3)-histidyl linkage compared with 8 alpha-O-tyrosyl substitution.
mesh_terms: D000818:Animals; D000906:Antibodies / Q000302:isolation & purification*; D002417:Cattle; D003429:Cross Reactions; D004591:Electrophoresis, Polyacrylamide Gel; D005182:Flavin-Adenine Dinucleotide / Q000276:immunology*; D005420:Flavoproteins / Q000276:immunology; D005779:Immunodiffusion; D007122:Immunoelectrophoresis; D007074:Immunoglobulin G / Q000276:immunology; D008929:Mitochondria, Heart / Q000201:enzymology; D013385:Succinate Dehydrogenase / Q000276:immunology
chemical_list: D000906:Antibodies; D005420:Flavoproteins; D007074:Immunoglobulin G; D005182:Flavin-Adenine Dinucleotide; D013385:Succinate Dehydrogenase