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Catalase is a common enzyme found in nearly all living organisms exposed to oxygen. It catalyzes the decomposition of hydrogen peroxide to water and oxygen. It is a very important enzyme in protecting the cell from oxidative damage by reactive oxygen species. Likewise, catalase has one of the highest turnover numbers of all enzymes; one catalase molecule can convert millions of hydrogen peroxide molecules to water and oxygen each second. Catalase is a tetramer of four polypeptide chains, each ov
Catalase allows hydrogen peroxide (H2O2) to be broken down into water (H2O) and oxygen (O2). Like other enzymes, catalase is not used up in the reaction, but is recycled to catalyze more reactions. Catalase supports up to 200,000 reactions per second.