文章基本信息

标题：Isolation and Characterization of a Human Intestinal Bacterium, Eubacterium sp. ARC-2, Capable of Demethylating Arctigenin, in the Essential Metabolic Process to Enterolactone
本地全文：下载
作者：Jong-Sik Jin ; Yu-Feng Zhao ; Norio Nakamura 等
期刊名称：Biological and Pharmaceutical Bulletin
印刷版ISSN：0918-6158
电子版ISSN：1347-5215
出版年度：2007
卷号：30
期号：5
页码：904-911
DOI：10.1248/bpb.30.904
出版社：The Pharmaceutical Society of Japan
摘要：Plant lignans, such as pinoresinol diglucoside, secoisolariciresinol diglucoside and arctiin, are metabolized to mammalian lignans, enterolactone or enterodiol, by human intestinal bacteria. Their metabolic processes include deglucosylation, ring cleavage, demethylation, dehydroxylation and oxidation. Here we isolated an intestinal bacterium capable of demethylating arctigenin, an aglycone of arctiin, to 2,3-bis(3,4-dihydroxybenzyl)butyrolactone (1) from human feces, and identified as an Eubacterium species ( E. sp. ARC-2), which is similar to Eubacterium limosum on the basis of morphological and biochemical properties and 16S rRNA gene sequencing. By incubating with E . sp. ARC-2, arctigenin was converted to 1 through stepwise demethylation. Demethylation of arctigenin by E. sp. ARC-2 was tetrahydrofolate- and ATP-dependent, indicating that the reaction was catalyzed by methyltransferase. Moreover, E. sp. ARC-2 transformed secoisolariciresinol to 2,3-bis(3,4-dihydroxybenzyl)-1,4-butanediol by demethylation.
关键词：human intestinal bacteria;plant lignan;arctigenin;Eubacterium;demethylation