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- W2396759623 abstract "Cytochrome P-450 catalysing 25-hydroxylation of vitamin D3 was purified from pig kidney microsomes. The enzyme fraction contained 7 nmol of cytochrome P-450/mg of protein and showed only one protein band with an apparent Mr of 50,500 upon SDS/polyacrylamide-gel electrophoresis. The purified cytochrome P-450 catalysed 25-hydroxylation of vitamin D3 up to 1,000 times more efficiently, and 25-hydroxylation of 1 alpha-hydroxyvitamin D3 up to 4000 times more efficiently, than the microsomes. The cytochrome P-450 required microsomal NADPH-cytochrome P-450 reductase for catalytic activity. Mitochondrial ferredoxin and ferredoxin reductase could not replace microsomal NADPH-cytochrome P-450 reductase. The enzyme preparation showed no detectable 25-hydroxylase activity towards vitamin D2 or 1 alpha-hydroxylase activity towards 25-hydroxyvitamin D3. CO inhibited the 25-hydroxylation by more than 85%. Mannitol, hydroquinone, catalase and superoxide dismutase did not affect the 25-hydroxylation. The possible role of the kidney microsomal cytochrome P-450 in the metabolism of vitamin D3 is discussed." @default.
- W2396759623 created "2016-06-24" @default.
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- W2396759623 date "1988-07-15" @default.
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- W2396759623 title "Purification of a cytochrome <i>P</i>-450 from pig kidney microsomes catalysing the 25-hydroxylation of vitamin D3" @default.
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- W2396759623 doi "https://doi.org/10.1042/bj2530549" @default.
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