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6.5.5. Hydroperoxidases
They utilize hydrogen peroxide as a substrate. Two enzymes fall into this category (i) Peroxidase, (ii) Catalase. (i) Peroxidase: It is found in milk and leukocytes and the prosthetic group is protoheme. It catalyzes the reduction of hydrogen peroxide by the help of ascorbic acid, quinines and cytochrome C which act as electron acceptors. (ii) Catalase: It is hemoprotein and found in blood and liver. It uses one molecule of H2O2 as a substrate electron donor and another molecule as electron acceptor. Its function is to destroy H2O2 formed by the action of aerobic dehydrogenases. |
Last modified: Wednesday, 7 March 2012, 6:35 AM