... oxidase; HABA, 2-(4-hydroxyphenylazo)benzoic acid;IT, ion trap; LSAO, lentil (Lens esculenta) amine oxidase; MALDI,matrix-assisted laser desorption/ionization; OVAO, sainfoin(Onobrychis viciifolia) ... specific tyrosine residue that requires both active sitecopper and molecular o xygen [2]. T he k ey step i n theoxidative deamination is conversion of the initial substrate Schiff base (quinoimine) ... Ascenzi,P.,Fasano,M.,Marino,M.,Venturini,G.&Federico,R. (2002) Agmatine oxidation by copper amine oxidase –biosynthesis a nd b iochemical characterization of N-amidino-2-hydroxypyrrolidine....