Destroys superoxide anion radicals which are normally produced within the cells and which are toxic to biological systems. 2 H(+) + 2 superoxide = H2O2 + O2 Binds 1 Mn(2+) ion per subunit. Homotetramer. Causes an allergic reaction in humans. Binds to IgE. On the 2D-gel the determined pI of this protein is: 7, its MW is: 24 kDa. Could be used for the diagnosis of allergy to Pleosporaceae. Belongs to the iron/manganese superoxide dismutase family.