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Title: Formation of hyodeoxycholic acid from muricholic acid and hyocholic acid by an unidentified gram-positive rod termed HDCA-1 isolated from rat intestinal microflora
Authors: Eyssen, H J ×
De Pauw, G
Van Eldere, Johan #
Issue Date: Jul-1999
Series Title: Applied and Environmental Microbiology vol:65 issue:7 pages:3158-63
Abstract: From the rat intestinal microflora we isolated a gram-positive rod, termed HDCA-1, that is a member of a not previously described genomic species and that is able to transform the 3alpha,6beta, 7beta-trihydroxy bile acid beta-muricholic acid into hyodeoxycholic acid (3alpha,6alpha-dihydroxy acid) by dehydroxylation of the 7beta-hydroxy group and epimerization of the 6beta-hydroxy group into a 6alpha-hydroxy group. Other bile acids that were also transformed into hyodeoxycholic acid were hyocholic acid (3alpha, 6alpha,7alpha-trihydroxy acid), alpha-muricholic acid (3alpha,6beta, 7alpha-trihydroxy acid), and omega-muricholic acid (3alpha,6alpha, 7beta-trihydroxy acid). The strain HDCA-1 could not be grown unless a nonconjugated 7-hydroxylated bile acid and an unidentified growth factor produced by a Ruminococcus productus strain that was also isolated from the intestinal microflora were added to the culture medium. Germfree rats selectively associated with the strain HDCA-1 plus a bile acid-deconjugating strain and the growth factor-producing R. productus strain converted beta-muricholic acid almost completely into hyodeoxycholic acid.
URI: 
ISSN: 0099-2240
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Laboratory for Experimental and Clinical Microbiology (-)
Laboratory of Clinical Bacteriology and Mycology
× corresponding author
# (joint) last author

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