J. Lipid Res. Neurobiology of Lipids (ISSN1683-5506)
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Journal of Lipid Research, Vol 22, 1060-1068, Copyright © 1981 by Lipid Research, Inc.

ARTICLES

Epimerization of the 7-hydroxy group of bile acids by the combination of two kinds of microorganisms with 7 alpha- and 7 beta-hydroxysteroid dehydrogenase activity, respectively

S Hirano and N Masuda

An unidentified gram-positive anaeroic organism capable of dehydrogenating the 7 beta-hydroxy group of ursodeoxycholic acid was recovered from human feces. By combined action of this organism with the ordinary 7 alpha-dehydrogenating bacteria, chenodeoxycholic acid and cholic acid alike were readily converted into their respective 7 beta-epimers and the reverse reactions were also carried out. The estimated levels of these 7 alpha- and 7 beta-dehydrogenating organisms among the intestinal microflora give a satisfactory explanation for the frequent appearance of the 7 beta-hydroxylated bile acids in vivo.
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J. M. Ridlon, D.-J. Kang, and P. B. Hylemon
Bile salt biotransformations by human intestinal bacteria
J. Lipid Res., February 1, 2006; 47(2): 241 - 259.
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