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We isolated a human intestinal bacterium, capable of cleaving the C-ring and dehydroxylating the B-ring of both (+)-catechin (2R,3S) and (-)-epicatechin (2R,3R). Although the strain was classified as Eggerthella (Eg.) lenta [named Eg. sp. CAT-1 (JF798636)] by 16S ribosomal RNA (rRNA) gene similarity, it was quite different in substrate specificity from a previously isolated strain, Eg. sp. SDG-2, which takes part in cleavage of the C-ring and dehydroxylation of the 3,4-dihydroxyphenyl moiety (B-ring) of (3R)-flavan-3-ol derivatives. On the other hand, both Eg. sp. CAT-1 and Eg. sp. SDG-2 showed the same substrate specificity against dehydroxylation of enantiomeric lignans, (+)- and (-)-dihydroxyenterodiol, and (+)- and (-)-dihydroxyenterolactone.

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Isolation and Characterization of a Human Intestinal Bacterium &lt;i&gt;Eggerthella&lt;/i&gt; sp. CAT-1 Capable of Cleaving the C-Ring of (+)-Catechin and (−)-Epicatechin, Followed by &lt;i&gt;p&lt;/i&gt;-Dehydroxylation of the B-Ring