J. Lipid Res. Acyl Labeled PIP's available August 1, 2008
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Journal of Lipid Research, Vol 22, 872-876, Copyright © 1981 by Lipid Research, Inc.

ARTICLES

Cholesterol 7 alpha-hydroxylase from human liver: partial purification and reconstruction into defined phospholipid-cholesterol vesicles

SK Erickson and B Bosterling

Cholesterol 7 alpha-hydroxylase, the rate-limiting enzyme for bile acid synthesis, was shown to be copurified with human liver microsomal cytochrome P-450. When these cytochrome P-450 species were reconstituted in phospholipid-cholesterol vesicles together with NADPH- cytochrome P-450 reductase, high cholesterol 7 alpha-hydroxylase activity was obtained in the presence of NADPH. The activity represented a twofold enrichment relative to cytochrome P-450 and 43- fold enrichment relative to total microsomal protein. Availability of such a preparation will allow further characterization of the enzyme and will also allow studies of its mechanisms of regulation.
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Copyright © 1981 by the American Society for Biochemistry and Molecular Biology.