Lignin degradation and detoxification of lignin-derived products (By similarity). In vitro, has activity towards 2,2'-azino-bis(3-ethylbenzthiazoline-6-sulfonic acid) (ABTS), catechol and hydroquinone but not towards 2,6-dimethoxy-phenol or guaiacol. 4 hydroquinone + O2 = 4 benzosemiquinone + 2 H2O Binds 4 Cu cations per monomer. Inhibited by NaN(3) and SDS. Partially inhibited by Fe(2+), Fe(3+) and Hg(2+) but not by other metal ions at a concentration of 10 mM. Optimum pH is 4. Activity decreases at higher pH and is lost at pH 6. Optimum temperature is 60 degrees Celsius. After incubation at 80 degrees Celsius or 20 degrees Celsius for 5 minutes 50% activity remains. Activity is lost after incubation at 100 degrees Celsius for 5 minutes. After incubation at 60 degrees Celsius for 1 hour 18% activity remains. Monomer. Belongs to the multicopper oxidase family.