Abstract：
:Mitochondrial sterol 27-hydroxylase (EC 1.14.13.15) is an important enzyme, not only in the formation of bile acids from cholesterol intermediates in the liver but also in the removal of cholesterol by side chain hydroxylation in extrahepatic tissues. The enzyme has been assayed by complicated methods using radiolabeled substrates or deuterium-labeled tracers. These methods may be inaccurate for measuring enzyme activity, because the amount of electron-transferring proteins may be insufficient for maximal velocity. To solve this problem, after solubilization of the enzyme from rat liver mitochondria with n-octyl-beta-d-glucopyranoside (OGP), we measured the enzyme activity by incubating the solubilized enzyme with saturated amounts of electron-transferring proteins. In our assay system, using 7alpha-hydroxy-4-cholesten-3-one (HCO) as a substrate, we could easily measure the product, 7alpha,27-dihydroxy-4-cholesten-3-one, with HPLC monitoring absorbance at 240 nm. The product formation was proportionate to the time up to 5 min and the protein concentration up to 0.5 mg of protein/ml. The maximal velocity of the enzyme was 1.1 nmol/min/mg of protein, which was 4- to 16-fold higher than previously reported values. A simple and accurate assay method for sterol 27-hydroxylase in rat liver mitochondria is herein described.
journal_name
J Lipid Resjournal_title
Journal of lipid researchauthors
Ota Y,Eto TA,Tanaka S,Sueta H,Shiotsuki H,Maeda Y,Une M,Chijiiwa Kdoi
10.1194/jlr.D200045-JLR200keywords:
subject
Has Abstractpub_date
2003-12-01 00:00:00pages
2400-5issue
12eissn
0022-2275issn
1539-7262pii
D200045-JLR200journal_volume
44pub_type
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journal_title：Journal of lipid research
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journal_title：Journal of lipid research
pub_type： 杂志文章
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更新日期：1981-03-01 00:00:00
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更新日期：1994-11-01 00:00:00
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journal_title：Journal of lipid research
pub_type： 杂志文章
doi：
更新日期：1987-03-01 00:00:00
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journal_title：Journal of lipid research
pub_type： 杂志文章
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