JOURNAL ARTICLE
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Solubilisation, purification and reconstitution of hepatic microsomal azoreductase activity.

Biochemical Pharmacology 1985 Februrary 2
Microsomal NADPH-cytochrome c (P-450) reductase and cytochrome P-450 were purified from the livers of phenobarbitone-treated rats. Purified NADPH-cytochrome c (P-450) reductase effected the NADPH-dependent reduction of FMN and FAD under anaerobic conditions in a non-enzymic manner, but was unable to reduce directly the azo dye, amaranth. In the presence of FMN, the purified reductase effected reduction of amaranth through the production of reduced FMN. Incorporation of NADPH-cytochrome c (P-450) reductase into the microsomal fraction increased the azoreductase activity of liver preparations from phenobarbitone-treated rats, but had no effect on azoreductase activity in preparations from control animals. Azoreductase activity was reconstituted into dilauroyl phosphatidylcholine vesicles containing purified cytochrome P-450 and purified NADPH-cytochrome c (P-450) reductase. In the absence of supplementary FMN, amaranth reduction was completely dependent upon all three components, but in the presence of FMN, the omission of any one component failed to abolish completely azoreductase activity.

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