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- W1981031671 abstract "7beta-Hydroxysteroid dehydrogenase (7beta-HSD), a specific enzyme active in the metabolization of 7beta-hydroxycholesterol, was purified about 300-fold from male rabbit liver microsomes using ion exchange, hydroxylapatite, 2'5'ADP Sepharose 4B, and high-performance liquid chromatography on the basis of its catalytic activity. The specific activity of the purified enzyme was 276 nmol/min/mg protein. The molecular weight of the purified enzyme was 34,000. The preferred coenzyme was beta-NADP+. The optimum pH for oxidation was around 7.7 in potassium phosphate buffer, and 11.0 in glycine-NaOH buffer. The purified enzyme catalyzed the synthesis of not only 7beta-hydroxycholesterol but also corticosterone and hydrocortisone. Enzyme activities toward these three substrates accompanied all purification steps of 7beta-HSD. The amino acid sequence of the N-terminal of the purified enzyme showed that 7beta-HSD had sequence similarity to rabbit type I 11beta-hydroxysteroid dehydrogenase (11beta-HSD), indicating that 7beta-HSD may belong to the rabbit type I 11beta-HSD family and may play the same role in the metabolism of 11-hydroxysteroids and 7-hydroxysterols." @default.
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- W1981031671 date "2004-07-01" @default.
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- W1981031671 title "Purification and characterization of 7β-hydroxysteroid dehydrogenase from rabbit liver microsomes" @default.
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- W1981031671 doi "https://doi.org/10.1016/j.jsbmb.2004.04.005" @default.
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