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pubmed-article:307550pubmed:abstractTextCytochrome P-45011beta has been solubilized and partially purified from bovine adrenal cortex mitochondria by means of chromatography on Octyl-Sepharose CL-4B or DEAE-Sepharose CL-6B. The partially purified P-450 preparations were about 90% pure as judged by sodium dodecyl sulfate-polyacrylamide gel electrophoresis, but had a low specific content of P-450 (between 1 and 2 nmol of P-450 per mg of protein). In the presence of purified preparations of adrenodoxin reductase and adrenodoxin, the partially purified P-450 preparations catalyzed NADPH-supported 11beta-hydroxylation of unconjugated and sulfoconjugated deoxycorticosterone. In the reconstituted system the hydroxylation of deoxycorticosterone sulfate proceeded at a much higher rate than in intact mitochondria, indicating that in the former case interactions between the hydrophilic substrate and P-450 were facilitated. In the presence of Triton X-100 the partially purified cytochrome P-45011beta had a Stokes radius of 4.5 nm, a sedimentation coefficient of 3.1 S, and a partial specific volume of about 0.85 cm3/g. These results indicate that the cytochrome P-45011beta . Triton X-100 complex had a molecular weight of about 100,000 and that P-45011beta bound about 1.1 g of Triton X-100 per g of protein. The P-45011beta . Triton X-100 complex was catalytically active in hydroxylation reactions supported by NADPH or the hydroxylating agent ortho-nitroiodosobenzene, suggesting that the monomer of cytochrome P-45011beta is the active form of the protein.lld:pubmed
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pubmed-article:307550pubmed:articleTitleThe active form of cytochrome P-45011beta from adrenal cortex mitochondria.lld:pubmed
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