Superoxide dismutases

Superoxide dismutases, EC 1.15.1.1, are metalloenzymes that protect cells against oxidative stress by scavenging toxic superoxide radicals, catalyzing their dismutation to molecular oxygen and hydrogen peroxide. The enzymes from most eukaryotes contain both copper and zinc, while those from mitochondria and most prokaryotes use manganese or iron. In foods they are part of the endogenous antioxidant defence of fresh plant and animal tissues, and their activity declines after harvest and slaughter as deterioration proceeds. They are also studied as protective additives and as markers of oxidative stress in stored foods.