Lentil seedlings amine oxidase: preparation and properties of the copper-free enzyme.

The reaction of copper-free lentil seedlings amine oxidase with substrates has been studied. While devoid of catalytic activity, this enzyme preparation is still able to oxidize two moles of substrate and to release two moles of aldehyde and two moles of ammonia per mole of dimeric protein. The same stoichiometry has been determined on the native enzyme in the absence of oxygen. Although copper is essential for the reoxidation of the reduced enzyme, a binding of oxygen to the copper-free protein has been demonstrated.