Cu/Zn-superoxide dismutase (SOD1) is a metalloenzyme that catalyzes the disproportionation of superoxide. This review summarizes intracellular processes for metal binding and disulfide formation in SOD1, both of which are essential to stabilization of the protein structure as well as its enzymatic function. Also, failure of those processes as a possible cause of a neurodegenerative disease through protein misfolding will be described.