Journal of Integrative Agriculture ›› 2017, Vol. 16 ›› Issue (06): 1358-1366.DOI: 10.1016/S2095-3119(16)61508-3

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  • 收稿日期:2016-06-16 出版日期:2017-06-20 发布日期:2017-06-08

High-level expression and purification of Plutella xylostella acetylcholinesterase in Pichia pastoris and its potential application

LIU Niu1, CHE Jun1, 2, LAI Duo1, 3, WEN Jin-jun1, XU Han-hong1   

  1. 1 State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources & Key Laboratory of Natural Pesticide and Chemical Biology, Ministry of Education/South China Agricultural University, Guangzhou 510642, P.R.China

    2 Shenzhen Longgang Inspection Station of Non-pollution Agricultural Products, Shenzhen 510172, P.R.China

    3 Institute of Fruit Tree Research, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, P.R.China

  • Received:2016-06-16 Online:2017-06-20 Published:2017-06-08
  • Contact: XU Han-hong, Tel: +86-20-85285127, E-mail: hhxu@scau.edu.cn
  • Supported by:

    This work was supported by a grant from the Public Benefit Research Foundation of China (200903052) and the Science and Technology Department of Guangdong Province, China (2009A020101003).

Abstract: The acetylcholinesterase 2 (AChE2) cloned from Plutella xylostella was first successfully expressed in methylotrophic yeast Pichia pastoris GS115.  One transformant with high-level expression of the recombinant AChE (rAChE, 23.2 U mL–1 in supernatant) was selected by plating on increasing concentrations of antibiotic G418 and by using a simple and specific chromogenic reaction with indoxyl acetate as a substrate.  The maximum production of rAChE reached about 11.8 mg of the enzyme protein per liter of culture.  The rAChE was ?rst precipitated with ammonium sulfate (50% saturation) and then puri?ed with procainamide af?nity column chromatography.  The enzyme was puri?ed 12.1-fold with a yield of 22.8% and a high speci?c activity of 448.3 U mg–1.  It was sensitive to inhibition by methamidophos and pirimicarb, the calculated 50% inhibitory concentration (IC50) values of the two pesticides were 0.357 and 0.888 mg L–1, respectively, and the calculated 70% inhibitory concentration (IC70) values were 0.521 and 0.839 mg L–1, respectively.  The results suggested that it has a potential application in the detection of pesticide residues.

Key words: Plutella xylostella, acetylcholinesterase, Pichia pastoris,, high-level expression