Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Improved Homologous Expression of the Acidic Lipase from Aspergillus niger

  • Zhu, Si-Yuan (Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University) ;
  • Xu, Yan (Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University) ;
  • Yu, Xiao-Wei (Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University)
  • Received : 2019.06.14
  • Accepted : 2019.11.19
  • Published : 2020.02.28
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Abstract

In this study, the acidic lipase from Aspergillus niger (ANL) was homologously expressed in A. niger. The expression of ANL was significantly improved by the expression of the native ANL with the introns, the addition of the Kozak sequence and the optimization of the signal sequences. When the cDNA sequence of ANL fused with the glaA signal was expressed under the gpdA promoter in A. niger, no lipase activity could be detected. We then tried to improve the expression by using the full-length ANL gene containing three introns, and the lipase activity in the supernatant reached 75.80 U/ml, probably as a result of a more stable mRNA structure. The expression was further improved to 100.60 U/ml by introducing a Kozak sequence around the start codon due to a higher translation efficiency. Finally, the effects of three signal sequences including the cbhI signal, the ANL signal and the glaA signal on the lipase expression were evaluated. The transformant with the cbhI signal showed the highest lipase activity (314.67 U/ml), which was 1.90-fold and 3.13-fold higher than those with the ANL signal and the glaA signal, respectively. The acidic lipase was characterized and its highest activity was detected at pH 3.0 and a temperature of 45℃. These results provided promising strategies for the production of the acidic lipase from A. niger.

Keywords

References

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