Purification and comparative properties of NADPH-cytochrome P-450 reductase from rat and rainbow trout: differences in temperature optima between reconstituted and microsomal trout enzymes

Archives of Biochemistry and Biophysics
D E WilliamsD R Buhler

Abstract

NADPH-cytochrome P-450 reductase has been purified to apparent homogeneity from liver microsomes of beta-naphthoflavone-treated rats and rainbow trout. The apparent monomeric molecular weights were 75,000 and 77,000 for the rat and trout, respectively. Differences in amino acid composition were observed, particularly for lysine, glycine, threonine, and tyrosine. Analysis of the flavin composition showed that there were 0.97 mol of FAD and 0.92 mol of FMN per mol of rat reductase, whereas the values for the trout enzyme were 1.06 and 0.76 for FAD and FMN, respectively. Trout NADPH-cytochrome c reductase was inhibited by anti-rat antibody, but not to the same extent as was the rat enzyme. No precipitin lines between the trout reductase and rat antibody were observed on Ouchterlony plates. Peptide patterns, on sodium dodecyl sulfate-polyacrylamide gel electrophoresis, following limited proteolysis were also markedly different. The trout enzyme was as effective, catalytically, as the rat enzyme in a reconstituted system that contained purified rat cytochrome P-448 and lipid. Comparison of ethoxyresorufin-O-deethylase temperature profiles with various combinations of purified trout and rat P-448, reductase, and lipid, in membranous ...Continue Reading

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Citations

Feb 1, 1995·Food and Chemical Toxicology : an International Journal Published for the British Industrial Biological Research Association·N TakahashiD E Williams
Oct 1, 1995·Food and Chemical Toxicology : an International Journal Published for the British Industrial Biological Research Association·N TakahashiG S Bailey
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