Abstract
Extracellular Mn-dependent peroxidase and oxidase have been purified from the culture of white rot fungus P. tigrinus 8 18 grown on wheat straw. Some physico-chemical and ligninolytic properties of these enzymes have been investigated. Both enzymes have been shown to decompose a dimeric model compound of β-β′ type (and oxidase, also to demethoxylate substrate); to cleave C α-C β in a nonphenolic model compound of β-1 type (Mn-peroxidase, also to split the C β-C 4 bond); to be involved in lignin polymerization-depolymerization reactions. Based on the data presented and considering the absence of lignin peroxidase in the extracellular ligninolytic enzyme complex of P. tigrinus, Mn-peroxidase is suggested to be the key enzyme of the complex.
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