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Luong NN, Tien NQD, Huy NX, Tue NH, Man LQ, Sinh DDH, Van Thanh D, Chi DTK, Hoa PTB, Loc NH. Expression of 42 kDa chitinase of Trichoderma asperellum (Ta-CHI42) from a synthetic gene in Escherichia coli. FEMS Microbiol Lett 2021; 368:6355433. [PMID: 34415008 DOI: 10.1093/femsle/fnab110] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2021] [Accepted: 08/18/2021] [Indexed: 11/14/2022] Open
Abstract
Chitinases are enzymes that catalyze the degradation of chitin, a major component of the cell walls of pathogenic fungi and cuticles of insects, gaining increasing attention for the control of fungal pathogens and insect pests. Production of recombinant chitinase in a suitable host can result in a more pure product with less processing time and a significantly larger yield than that produced by native microorganisms. The present study aimed to express the synthetic chi42 gene (syncodChi42), which was optimized from the chi42 gene of Trichoderma asperellum SH16, in Escherichia coli to produce 42 kDa chitinase (Ta-CHI42); then determined the activity of this enzyme, characterizations and in vitro antifungal activity as well as its immunogenicity in mice. The results showed that Ta-CHI42 was overexpressed in E. coli. Analysis of the colloidal chitin hydrolytic activity of purified Ta-CHI42 on an agar plate revealed that this enzyme was in a highly active form. This is a neutral chitinase with pH stability in a range of 6-8 and has an optimum temperature of 45°C with thermal stability in a range of 25-35°C. The chitinolytic activity of Ta-CHI42 was almost completely abolished by 5 mM Zn2+ or 1% SDS, whereas it remained about haft under the effect of 1 M urea, 1% Triton X-100 or 5 mM Cu2+. Except for ions such as Mn2+ and Ca2+ at 5 mM that have enhanced chitinolytic activity; 5 mM of Na+, Fe2+ or Mg2+ ions or 1 mM EDTA negatively impacted the enzyme. Ta-CHI42 at 60 U/mL concentration strongly inhibited the growth of the pathogenic fungus Aspergillus niger. Analysis of western blot indicated that the polyclonal antibody against Ta-CHI42 was greatly produced in mice. It can be used to analyze the expression of the syncodChi42 gene in transgenic plants, through immunoblotting assays, for resistance to pathogenic fungi.
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Affiliation(s)
- Nguyen Ngoc Luong
- Institute of Bioactive Compounds and Department of Biotechnology, University of Sciences, Hue University, 77 Nguyen Hue st, Hue 530000, Vietnam
| | - Nguyen Quang Duc Tien
- Institute of Bioactive Compounds and Department of Biotechnology, University of Sciences, Hue University, 77 Nguyen Hue st, Hue 530000, Vietnam
| | - Nguyen Xuan Huy
- Department of Biology, University of Education, 34 Le Loi st, Hue 530000, Vietnam
| | - Nguyen Hoang Tue
- Institute of Bioactive Compounds and Department of Biotechnology, University of Sciences, Hue University, 77 Nguyen Hue st, Hue 530000, Vietnam
| | - Le Quang Man
- Institute of Bioactive Compounds and Department of Biotechnology, University of Sciences, Hue University, 77 Nguyen Hue st, Hue 530000, Vietnam
| | - Duong Duc Hoang Sinh
- Institute of Bioactive Compounds and Department of Biotechnology, University of Sciences, Hue University, 77 Nguyen Hue st, Hue 530000, Vietnam
| | - Dang Van Thanh
- Institute of Bioactive Compounds and Department of Biotechnology, University of Sciences, Hue University, 77 Nguyen Hue st, Hue 530000, Vietnam
| | - Duong Thi Kim Chi
- Institute of Bioactive Compounds and Department of Biotechnology, University of Sciences, Hue University, 77 Nguyen Hue st, Hue 530000, Vietnam
| | - Phung Thi Bich Hoa
- Institute of Bioactive Compounds and Department of Biotechnology, University of Sciences, Hue University, 77 Nguyen Hue st, Hue 530000, Vietnam.,Department of Biology, University of Education, 34 Le Loi st, Hue 530000, Vietnam
| | - Nguyen Hoang Loc
- Institute of Bioactive Compounds and Department of Biotechnology, University of Sciences, Hue University, 77 Nguyen Hue st, Hue 530000, Vietnam
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