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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

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    Abstract - Issue Sep 2010, 31 (5)                                     Back


abstract_01

Preparation and assay of C-glucosyltransferase from

roots of Pueraria lobata

 

Gang Chen1,2, Xuan Wu1, Wen-Ling Zhou1 and Ling Li*1

 

1Guangdong Key Lab of Biotechnology for Plant Development, College of Life Sciences,

South China Normal University, Guangzhou - 510 631, China

 

2Department of Biology, Zhaoqing University, Zhaoqing - 526 061, China

(Received: July 25, 2008; Revised received: February 02, 2009; Re-revised received: February 28, 2009; Accepted: March 30, 2009)

 

Abstract: C-glucosyltransferase (EC 2.4.1.X) is one of the key enzymes for the biosynthesis of puerarin. This paper describes the methodology in purification and assay of the enzyme for the first time in Puerarin lobata (Willd.) Ohwi. C-glucosyltransferase from roots of P. lobata was extracted and partially purified by (NH4)2SO4 saturation. The effects of pH, temperature, and substrate concentration on the activity of the enzyme were investigated. The properties of the puerarin produced by C-glucosyltransferase were studied by thin layer chromatography (TLC) and high performance liquid chromatography (HPLC). The peak activity of C-glucosyltransferase was detected in fraction of by 80% saturation of (NH4)2SO4 and the optimal conditions for enzymatic reaction were 35.5 mmol l-1 of isoliquiritigenin and 560 mmol l-1 of UDP-G at pH 8.1, 28oC for 1 h. Mn2+ at 1 mmol l-1 and Al3+ at 1 mmol l-1 increased the enzyme activity, while Mg2+ inhibited its activity. The enzyme activity in Nicotiana tabacum and P. lobata were detected under the above assay conditions. Higher activity was found in roots than in leaves and stems of P. lobata, while no enzyme activity was detected in leaves of N. tabacum. It was the first time that activity of C-glucosyltransferase, which transforms isoliquiritigenin to puerarin, was detected in P. lobata.

Key words: Pueraria lobata (Willd.) Ohwi, Biosynthesis of puerarin, C-glucosyltransferase, C-glucosylation

PDF of full length paper is available online

 

 

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