Promoting effect of licorice extract on induction of β-glucuronidase in Penicillium purpurogenum Li-3

WANG Dong; HUANG Shen; DAI Dazhang; LI Chun; LIU Guiyan

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Promoting effect of licorice extract on induction of β-glucuronidase in Penicillium purpurogenum Li-3

WANG Dong,HUANG Shen,DAI Dazhang,LI Chun #,LIU Guiyan *

School of Life Science, Beijing Institute of Technology

*Correspondence author

#Submitted by

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Funding: The Specialized Research Fund for the Doctoral Program of Higher Education （No.No: 20091101110036, 20121101110050）

Opened online:19 February 2014

Accepted by: none

Citation: WANG Dong,HUANG Shen,DAI Dazhang.Promoting effect of licorice extract on induction of β-glucuronidase in Penicillium purpurogenum Li-3[OL]. [19 February 2014] http://en.paper.edu.cn/en_releasepaper/content/4585317

Penicillium purpurogenum Li-3, a fungus producing β-glucuronidase (PGUS), can modify glycyrrhizin (GL) to glycyrrhetinic acid monoglucuronide (GAMG) when grown in medium with GL as the sole carbon source. In order to improve the conversion rate of GL to GAMG and the yield of GAMG, licorice extract (LE) was added as an inducer to enhance the production of PGUS, and the influence of LE on the conversion rate of GL to GAMG was studied in this work. When the strain were grown in the medium containing LE and GL (concentration ratio was 2:3), the conversion rate of GL was 84.12% with a 38.18% increase and the yield of GAMG was 80.47% with an increase of 37.18% than the medium only containing GL at 48h and the enzyme activity of β-glucuronidase was also enhanced from 22.4U/ml to 82.3U/ml. The results showed that the induced expression of PGUS was highly improved when a certain amount of LE was added into the medium.?????

Keywords:β-glucuronidase; licorice extract; Penicillium purpurogenum Li-3; glycyrrhizin; glycyrrhetinic acid monoglucuronide?????

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