Laccase is commonly found in white-rot fungi and catalyses the abstrac
tion of one electron from the phenolic hydroxyl group to polymerize or
depolymerize lignin model compounds, Laccase degrades both beta-1 and
beta-0-4 dimers via C-alpha-C-beta cleavage, C-alpha oxidation and al
kyl-aryl cleavage. Also, aromatic ring cleavage may be detected follow
ing the action of laccase. Laccase can also oxidize non-phenolic compo
unds when primary mediators, such as 2,2'-azinobis(3-ethylbenzthiazoli
ne-6-sulfonate), are co-present, Laccase produces Mn(III) chelates whi
ch allow wood-decaying enzymes to penetrate wood cell walls. Laccase i
s considered to be capable of degrading lignin together with lignin pe
roxidase and manganese peroxidase.