Destroys radicals which are normally produced within the cells and which are toxic to biological systems. Probably involved in the protection against oxidative stress during pollen development. 2 H(+) + 2 superoxide = H2O2 + O2 Binds 1 copper ion per subunit. Binds 1 zinc ion per subunit. Inhibited by KCN and H(2)O(2). Expressed in fruits, leaves and pollen grains. Several isoforms of the allergen exist due to polymorphism. Causes an allergic reaction in human. Allergen from olive pollen. Important in Mediterranean countries and California. Its prevalence is related to the geographic area. Belongs to the Cu-Zn superoxide dismutase family.