Oxidase of the white rot fungus Panus tigrinus 8/18

Abstract

Extracellular oxidase of the white rot fungus Panus tigrinus (earlier reported as laccase) contains copper but has no absorption spectrum typical of 'blue' oxidases. Thioglycolate and sodium azide inhibit the activity of this enzyme at concentrations 2.5-3 orders lower than those needed for fungal laccases. The oxidase of P. tigrinus oxidizes syringaldazine, coniferyl alcohol, ABTS, syringic acid, diaminobenzidine, guaiacol, catechol and vanillylacetone with different efficiencies. Oxygen consumption and no hydrogen peroxide formation were detected during substrate oxidation by P. tigrinus oxidase. It is proposed that P. tigrinus oxidase is a new ligninolytic enzyme.