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Kinetic and solvent deuterium isotope effects in the oxidation of putrescine catalysed by enzyme diamine oxidase

In this study, the kinetic isotope effects and solvent isotope effects in the reaction of the deamination of [(1R)-2H ] putrescine – catalysed by enzyme diamine oxidase (EC 1.4.3.6) – were determined using a non-competitive spectroscopic method. Putrescine, stereospecifically labelled with deuterium, was obtained by enzymatic decarboxylation of l-ornithine that was carried out in a fully deuteriated incubation medium.