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. Inhibited by the copper chelator diethyl dithiocarbamate. Homodimer. Does not bind zinc ions. Has normal enzyme activity in the absence of zinc ions. Belongs to the Cu-Zn superoxide dismutase family. Lacks two conserved histidine residues that bind copper and zinc.