Occurs in almost all aerobically respiring organisms and serves to protect cells from the toxic effects of hydrogen peroxide. 2 H2O2 = 2 H2O + O2 Active from pH 4 to 12. Homotetramer. Principally associated with the cell wall of conidia. Main catalase activity in conidia, during germination of conidia, and initial growth. During prestationary growth. By ethanol and in the presence of air by heat shock. Inactivated by isopropanol and 20 mM 3-amino-1,2,4-triazole. Glycosylated; with alpha-glucose and/or alpha-mannose. Belongs to the catalase family.