title: Isolation of pure, catalytically active human liver monoamine oxidase B: antibody complex.
abstract: Monoamine oxidase B was purified from human liver mitochondria using a monoclonal antibody, MAO B-1C2, which recognizes monoamine oxidase B but not A. Triton X-100 extracts of mitochondria were incubated with purified MAO B-1C2 (IgG1), and the catalytically active enzyme:antibody complex was isolated by affinity chromatography on Protein A-Sepharose. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis of the complex revealed the presence of four polypeptide bands (monoamine oxidase B, 57,900 dalton; antibody heavy chain, 52,200 dalton; and two light chains, 29,400 and 27,700 dalton), and indicated a 1:1 stoichiometric ratio of enzyme to antibody. This method gave 154-fold purification of the enzyme from mitochondria.
mesh_terms: D000328:Adult; D000936:Antigen-Antibody Complex / Q000302:isolation & purification*; D004591:Electrophoresis, Polyacrylamide Gel; D006801:Humans; D007527:Isoenzymes / Q000276:immunology / Q000302:isolation & purification* / Q000378:metabolism; D008297:Male; D008930:Mitochondria, Liver / Q000201:enzymology*; D008970:Molecular Weight; D008995:Monoamine Oxidase / Q000276:immunology / Q000302:isolation & purification* / Q000378:metabolism
chemical_list: D000936:Antigen-Antibody Complex; D007527:Isoenzymes; D008995:Monoamine Oxidase