Destroys superoxide anion radicals which are normally produced within the cells and which are toxic to biological systems (Probable). Partially complements double sodA-sodB deletions in E.coli (PubMed:8244935). 2 H(+) + 2 superoxide = H2O2 + O2 Binds 1 Fe cation per subunit. Homodimer. By growth in a high-phosphate succinate medium (at protein level) (PubMed:8244935). Strongly induced by growth on medium containing FeSO(4) (at protein level) (PubMed:8806672). Belongs to the iron/manganese superoxide dismutase family.