Protects DNA from oxidative damage by sequestering intracellular Fe(2+) ion and storing it in the form of Fe(3+) oxyhydroxide mineral. One hydrogen peroxide oxidizes two Fe(2+) ions, which prevents hydroxyl radical production by the Fenton reaction (By similarity). It binds and incorporates Fe(2+) iron. Is responsible for hydrogen peroxide resistance. Does not bind DNA. 2 Fe(2+) + 2 H(+) + H2O2 = 2 Fe(3+) + 2 H2O Homododecamer. The 12 subunits form a hollow sphere into which the mineral iron core can probably be deposited. Can store up to 480 Fe(3+) (By similarity). 12 di-nuclear ferroxidase centers are located at the interfaces between subunits related by 2-fold symmetry axes. Belongs to the Dps family.