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Improving the secretory expression of active recombinant AaIT in Pichia pastoris by changing the expression strain and plasmid

Abstract

Scorpion long-chain insect selective neurotoxin AaIT has the potential to be used against agricultural insect pests. However, there is still a lack of a heterologous gene expression system that can express AaIT efficiently. Here, using X33 as the host strain and pPICZαA as the expression vector, one transformant had the highest expression of recombinant AaIT (rAaIT) was obtained, and secreted as high as 240 mg/l rAaIT in fed-batch fermentation. Secretory rAaIT was purified by Ni2+-nitriloacetic affinity and CM chromatography, and 8 mg of high purity rAaIT were purified from 200 ml fed-batch fermentation cultures. Injecting silkworm (Bombyx mori Linnaeus) and Galleria mellonella larvae with rAaIT resulted in obvious neurotoxin symptoms and led to death. These results demonstrate that a large amount of anti-insect active rAaIT could be prepared efficiently.

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Acknowledgements

This work was supported in part by Funds from Project funded by China Postdoctoral Science Foundation (2016M590867), Project funded of Chongqing Postdoctoral Science Foundation (Xm2016075) and Scientific Research Fund of Hunan Provincial Education Department (15A147).

Author information

Correspondence to Hongbo Li or Yuxian Xia.

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Supplementary material 1 (MOV 25563 KB)

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Li, H., Xia, Y. Improving the secretory expression of active recombinant AaIT in Pichia pastoris by changing the expression strain and plasmid. World J Microbiol Biotechnol 34, 104 (2018) doi:10.1007/s11274-018-2484-x

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Keywords

  • Scorpion insect neurotoxin
  • AaIT
  • Pichia pastoris
  • Fed-batch
  • Expression and purification