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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 3α,6β,7β-trihydroxy bile acid β-muricholic acid into hyodeoxycholic acid (3α,6α-dihydroxy acid) by dehydroxylation of the 7β-hydroxy group and epimerization of the 6β-hydroxy group into a 6α-hydroxy group. Other bile acids that were also transformed into hyodeoxycholic acid were hyocholic acid (3α,6α,7α-trihydroxy acid), α-muricholic acid (3α,6β,7α-trihydroxy acid), and ω-muricholic acid (3α,6α,7β-trihydroxy acid). The strain HDCA-1 could not be grown unless a nonconjugated 7-hydroxylated bile acid and an unidentified growth factor produced by aRuminococcus 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-producingR. productus strain converted β-muricholic acid almost completely into hyodeoxycholic acid.

applied and environmental microbiology

Formation of Hyodeoxycholic Acid from Muricholic Acid and Hyocholic Acid by an Unidentified Gram-Positive Rod Termed HDCA-1 Isolated from Rat Intestinal Microflora