▣ Lac

• Nomenclature Committee of the International Union of Biochemistry and Molecular Biology

• Accepted name: laccase (EC 1.10.3.2)

• Reaction: 4 benzenediol + O2 = 4 benzosemiquinone + 2 H2O

• Other name(s): urishiol oxidase; urushiol oxidase; p-diphenol oxidase

• Systematic name: benzenediol:oxygen oxidoreductase

• Comments: A group of multi-copper proteins of low specificity acting on both o- and p-quinols, and often acting also on aminophenols and phenylenediamine. The semiquinone may react further either enzymically or non-enzymically.