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Authors
Suzuki, Takao
Keywords
Bacteroides
bile acid
biotransformation
dehydrogenase
hydrolase
Abstract
The effects of Bacteroides sp. strain T-40 isolated from human feces on the biotransformation of bile acids were examined in an anaerobic culture system. Bacteroides sp. T-40 oxidized cholic acid (CA) and chenodeoxycholic acid (CDCA) to 3α,12α-dihydroxy-7-oxo-5β-cholanoic acid and 3α-hydroxy-7-oxo-5β-cholanoic acid, and reduced these oxo-bile acids to CA and CDCA, respectively. However, the reduction activities were lower than the oxidation activities. Hyocholic acid was dehydrogenated, but to a lesser extent than CA or CDCA. On the other hand, α-muricholic acid, which has a hydroxyl group at the position of 7α, was not dehydrogenated. Glycocholic acid was converted to free 3α,12α-dihydroxy-7-oxo-5β-cholanoic acid but any glycine conjugated 7-oxo product was not detected. These data indicate that Bacteroides sp. T-40 possesses bile acid hydrolase and 7α-hydroxysteroid dehydrogenase, by which conjugated bile acids are initially deconjugated, and then undergo oxidization of the 7α-hydroxy group.
Publisher
Tottori University Faculty of Medicine
Content Type
Journal Article
ISSN・ISBN
1346-8049
NCID
AA00892882
Journal Title
Yonago Acta medica
Current Journal Title
Yonago Acta medica
Volume
50
Issue
2
Start Page
33
End Page
40
Published Date
2007-06
Text Version
Publisher
Rights
Yonago Acta medica 編集委員会
Citation
Yonago Acta medica. 2007, 50(2), 33-40
Department
Faculty of Medicine/Graduate School of Medical Sciences/University Hospital
Language
English