The charge distribution and Fukui function in the superoxide dismutases were calculated in terms of an atom-bond electronegativity equalization method (ABEEM). The results show that charge transfers of metal ions range from 0.1e to 0.3e, and charge transfers of the coordinated atoms and others are quite small when the active center in the superoxide dismutase catalyzes the superoxide anion radical. Fukui function of a metal ion is bigger than those of the coordinated atoms and others at the active center, b...