Abstract

The microsomal heme oxygenase system consists of heme oxygenase and NADPH-cytochrome P-450 reductase, and is considered to play a key role in the physiological heme catabolism to yield biliverdin in animals. Heme oxygenase purified from either pig spleen or rat liver has a minimum molecular weight of 32 000, and binds heme to form a 1:1 complex which exhibits properties resembled to those of hemoglobin and myoglobin. Heme degradation in the heme oxygenase reaction proceeds essentially as a series of autocatalytic oxidation of heme which is bound to heme oxygenase. The possible mechanism of heme degradation in the heme oxygenase reaction was presented.

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