Catalase is an essential enzyme in the decomposition of intracellular hydrogen peroxide (H2O2). In Saccharomyces
cerevisiae cells, two different types of catalase have been found (Traczyk et al. 1985; Skoneczny and Rytka, 2000),
which were designated catalase type A and catalase type T * Corresponding autor (Seah et al. 1973). The two enzymes are encoded by different genes (CTA1 and CTT1 respectively), possessing independent control and being localized in different
compartments: catalase T is a cytoplasm enzyme whereas catalase A is localized in peroxisomes (Lapinskas et al.
1993). The molecular weights of the biologically active, homotetrameric enzymes are 170-190 kD and 225-250 kD
for catalase A and T respectively (Klei et al. 1990)