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Enhanced expression of endoinulinase from Aspergillus niger by codon optimization in Pichia pastoris and its application in inulooligosaccharide production

  • Fermentation, Cell Culture and Bioengineering
  • Published:
Journal of Industrial Microbiology & Biotechnology

Abstract

In the present study, the endoinulinase gene (EnInu) from Aspergillus niger CICIM F0620 was optimized according to the codon usage of Pichia pastoris and both the native and the optimized gene were expressed in P. pastoris. Use of the optimized gene resulted in the secretion of recombinant endoinulinase activity that reached 1,349 U ml−1, 4.18 times that observed using the native gene. This is the highest endoinulinase activity reported to date. The recombinant enzyme was optimally active at pH 6.0 and 60 °C. Moreover, inulooligosaccharides production from inulin was studied using the recombinant enzyme produced from the optimized gene. After 8 h under optimal conditions, which included 400 g l−1 inulin, an enzyme concentration of 40 U g−1 substrate, 50 °C and pH 6.0, the inulooligosaccharide yield was 91 %. The high substrate concentration and short reaction time described here should reduce production costs distinctly, compared with the conditions used in previous studies. Thus, this study may provide the basis for the industrial use of this recombinant endoinulinase for the production of inulooligosaccharides.

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Acknowledgments

This work was financially supported by the Fundamental Research Funds for the Central Universities (JUSRP211A05 and JUSRP51304A), the National Natural Science Foundation of China (31271813), and the 111 Project (111-2-06).

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Authors and Affiliations

  1. State Key Laboratory of Food Science and Technology, Jiangnan University, 1800 Lihu Ave, Wuxi, 214122, People’s Republic of China

    Miao He, Dan Wu, **g Wu & Jian Chen

  2. School of Biotechnology and Key Laboratory of Industrial Biotechnology, Ministry of Education, Jiangnan University, 1800 Lihu Ave, Wuxi, 214122, People’s Republic of China

    Miao He, Dan Wu, **g Wu & Jian Chen

Authors
  1. Miao He
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  2. Dan Wu
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  3. **g Wu
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  4. Jian Chen
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Correspondence to **g Wu.

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He, M., Wu, D., Wu, J. et al. Enhanced expression of endoinulinase from Aspergillus niger by codon optimization in Pichia pastoris and its application in inulooligosaccharide production. J Ind Microbiol Biotechnol 41, 105–114 (2014). https://doi.org/10.1007/s10295-013-1341-z

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  • DOI: https://doi.org/10.1007/s10295-013-1341-z

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