Destroys radicals which are normally produced within the cells and which are toxic to biological systems. May play a role in favoring mycobacterial survival in phagocytes (By similarity). 2 H(+) + 2 superoxide = H2O2 + O2 Binds 1 copper ion per subunit. Binds 1 zinc ion per subunit. Belongs to the Cu-Zn superoxide dismutase family. Lacks three conserved histidine residues and one conserved aspartate residue that bind copper and zinc.