Biological and Pharmaceutical Bulletin
Online ISSN : 1347-5215
Print ISSN : 0918-6158
ISSN-L : 0918-6158
Purification and Characterization of Glycyrrhetic Acid Mono-glucuronide β-D-Glucuronidase in Eubacterium sp. GLH
Taiko AKAO
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1999 Volume 22 Issue 1 Pages 80-82

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Abstract

Glycyrrhetic acid mono-glucuronide (GAMG), 1-(18β-glycyrrhet-3-yl)-β-D-glucopyranuroic acid, was hydrolyzed to glycyrrhetic acid (GA) by GAMG β-D-glucuronidase in Eubacterium sp. GLH from human intestinal bacteria. The enzyme had an optimum pH of 5.0 and was purified from a crude extract by Butyl Toyopearl 650 S, Toyopearl HW-55 S, Hydroxyapatite and DEAE-Toyopearl 650 M column chromatography. the purified enzyme showed a specific activity of 495 nmol/min/mg protein and a single band on Coomassie brilliant blue staining and a molecular weight of about 43 kDa on sodium dodecyl sulfate (SDS)-polyacrylamide gel electrophoresis.The apparent molecular weight was 49.5 kDa, as estimated by Toyopearl HW-55 S column chromatography. Also, the enzyme seemed to have a sulfhydryl group(s) in its active site with a K, m value of 77×10-3 M.

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