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- W1508610451 abstract "Microsomal testosterone 16 alpha-hydroxylase (cytochrome P-450(16) alpha) was purified from the livers of male 129/J mice based on enzyme activity in the eluates from columns of DEAE Bio-Gel A, hydroxylapatite, and isobutyl-Sepharose 4B. The specific cytochrome P-450 content of the purified P-450(16) alpha fraction was 9.5 nmol/mg of protein. The specific testosterone 16 alpha-hydroxylation activity of the purified P-450(16) alpha fraction was 80 nmol/min/nmol of cytochrome P-450 or 764 nmol/min/mg of protein, and these values were about 40- and 400-fold higher, respectively, than the activity of solubilized microsomes. The purified P-450(16) alpha showed extremely high regioselectivity and stereospecificity for testosterone hydroxylation; more than 90% of the testosterone metabolites formed by the purified P-450(16) alpha fraction was 16 alpha-hydroxytestosterone. The purified anti-P-450(16) alpha antibody exhibited absolute specificity for inhibition of testosterone 16 alpha-hydroxytestosterone was inhibited by the anti-P-450(16) alpha. Anti-P-450(16) alpha inhibited the 16 alpha-hydroxylation activity of intact microsomes prepared from livers of male or female 129/J mice more than 90%, indicating that P-450(16) alpha is the major cytochrome P-450 isozyme catalyzing 16 alpha-hydroxylation activity of testosterone in these microsomal preparations. The purified P-450(16) alpha fraction also possessed high benzphetamine N-demethylation activity relative to the rates found with other xenobiotic substrates tested in this report." @default.
- W1508610451 created "2016-06-24" @default.
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- W1508610451 date "1984-10-01" @default.
- W1508610451 modified "2023-09-30" @default.
- W1508610451 title "Mouse liver testosterone 16 alpha-hydroxylase (cytochrome P-450(16) alpha). Purification, regioselectivity, stereospecificity, and immunochemical characterization." @default.
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- W1508610451 doi "https://doi.org/10.1016/s0021-9258(20)71352-9" @default.
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