Bifunctional enzyme with both catalase and broad-spectrum peroxidase activity. Shows peroxidase specificity towards odianisidine, ABTS and pyrogallol, but methoxyphenol and 2-chloronaphthol are not peroxidized. AH2 + H2O2 = A + 2 H2O 2 H2O2 = 2 H2O + O2 Binds 1 heme b (iron(II)-protoporphyrin IX) group per dimer. Optimum pH is 5.5 for the peroxidase reaction and 6.0 for the catalase reaction. Active from pH 5.5 to 8.5. Homodimer or homotetramer. Formation of the three residue Trp-Tyr-Met cross-link is important for the catalase, but not the peroxidase activity of the enzyme. Belongs to the peroxidase family. Peroxidase/catalase subfamily.