Expression of Aspergillus niger pelanase in Escherichia coli and enzymatic property characterization

  • ZHANG Haiyun ,
  • MA Jianing ,
  • LI Yangyang ,
  • YANG Penghui ,
  • SONG Weiyan ,
  • LIU Song
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  • 1(Science Center for Future Foods, Jiangnan University, Wuxi 214122, China)
    2(School of Biotechnology, Jiangnan University, Wuxi 214122, China)
    3(School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China)

Received date: 2022-11-22

  Revised date: 2022-12-23

  Online published: 2023-11-01

Abstract

Acid pectin lyase can break the a-1,4 glycosidic bond in pectin by b-trans-elimination to form unsaturated oligogalacturonic acid, which is important for the degradation of highly esterified pectin in food and other industries. In this study, acidic pectin lyase (pelA) from Aspergillus niger AG11 was expressed in Escherichia coli BL21 (DE3), and the protein tag optimization and enzymatic properties were investigated. It was finally determined that the highest intracellular enzyme activity of pelA was achieved at 3.25 U/mL with the N-terminal fusion of carbohydrate-binding structural domain (CBM), 4.12-fold higher than the initial condition. The enzymatic properties of pelA were determined before and after CBM resection. The results showed that the specific enzyme activity, optimum reaction temperature and optimum reaction pH of pelA were 15.45 U/mg, 40°C and 5.0, respectively. PelA maintained more than 80% activity at 30-50°C incubation for 2 h, which was the same as pelA+CBM. The relative enzyme activity was maintained above 60% by incubation at 40 ℃ and pH 4.0-5.0 for 2 h. At this time, pelA+CBM had more than 80% activity. Using citrus pectin as the substrate, the Km and kcat of pelA were 4.44 mmol/L and 31.44 s-1 , respectively. The results of the study laid the foundation for the molecular modification of pelA and its application in industrial production.

Cite this article

ZHANG Haiyun , MA Jianing , LI Yangyang , YANG Penghui , SONG Weiyan , LIU Song . Expression of Aspergillus niger pelanase in Escherichia coli and enzymatic property characterization[J]. Food and Fermentation Industries, 2023 , 49(19) : 22 -29 . DOI: 10.13995/j.cnki.11-1802/ts.034342

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