title: The organic cofactor in plasma amine oxidase: evidence for pyrroloquinoline quinone and against pyridoxal phosphate.
abstract: Plasma amine oxidases (EC 1.4.3.6) are classified as containing the organic cofactor pyridoxal phosphate. Biochemical and bioassays on the pig plasma amine oxidase fail to reveal the presence of pyridoxal phosphate and 31P n.m.r. evidence is also inconsistent with pyridoxal phosphate in the enzyme. Resonance Raman spectral studies on phenylhydrazone derivatives of the pig and bovine plasma enzymes have been carried out and comparisons made with the corresponding derivatives of pyridoxal phosphate and pyrroloquinoline quinone (PQQ). The resonance Raman evidence indicates that the cofactor in both plasma amine oxidases is PQQ or a closely related species and not pyridoxal phosphate. The results substantiate earlier reports concerning the identity of the organic cofactor.
mesh_terms: D006631:Amine Oxidase (Copper-Containing); D000818:Animals; D002417:Cattle; D003067:Coenzymes / Q000097:blood*; D006835:Hydrazones / Q000097:blood; D009682:Magnetic Resonance Spectroscopy; D000587:Oxidoreductases Acting on CH-NH Group Donors / Q000097:blood*; D045542:PQQ Cofactor; D011732:Pyridoxal Phosphate / Q000097:blood*; D011804:Quinolines / Q000097:blood*; D013059:Spectrum Analysis, Raman; D013552:Swine
chemical_list: C001072:2,4-dinitrophenylhydrazone; D003067:Coenzymes; D006835:Hydrazones; D011804:Quinolines; D011732:Pyridoxal Phosphate; D045542:PQQ Cofactor; D006631:Amine Oxidase (Copper-Containing); D000587:Oxidoreductases Acting on CH-NH Group Donors