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Reduced methanol input induces increased protein output by AOX1 promoter in a trans-acting elements engineered Pichia pastoris

  • Jinjia Wang
  • Xiaolong Wang
  • Lei Shi
  • Yuanxing Zhang
  • Xiangshan ZhouEmail author
  • Menghao CaiEmail author
Fermentation, Cell Culture and Bioengineering - Short Communication

Abstract

High oxygen consumption and heat release caused by methanol catabolism usually bring difficulties to industrial scale-up and cost for protein expression driven by methanol-induced AOX1 promoter in Pichia pastoris. Here, reduced methanol feeding levels were investigated for expression of insulin precursor in a trans-acting elements engineered P. pastoris strain MF1-IP. Insulin precursor expression level reached 6.69 g/(L supernatant) at the methanol feeding rate of 6.67 mL/(h·L broth), which was 59% higher than that in the wild-type strain WT-IP at the methanol feeding rate of 12 mL/(h·L broth). Correspondingly, the insulin precursor expression level in fermentation broth and maximum specific insulin precursor production rate was 137 and 77% higher than the WT-IP, respectively. However, oxygen consumption and heat evolution were reduced, and the highest oxygen consumption rate and heat evolution rate of the MF1-IP were 18.0 and 37.7% lower than the WT-IP, respectively.

Keywords

Pichia pastoris Insulin precursor Methanol induction AOX1 promoter Protein expression 

Notes

Acknowledgements

This work was supported by the Shanghai Science and Technology Innovation Action Plan (17JC1402400), Fundamental Research Funds for the Central Universities (22A201514040), National Special Fund for State Key Laboratory of Bioreactor Engineering (2060204) and Talent Program of School of Biotechnology in East China University of Science and Technology.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

This article does not contain any studies with human participants or animals performed by any of the authors.

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Copyright information

© Society for Industrial Microbiology and Biotechnology 2017

Authors and Affiliations

  1. 1.State Key Laboratory of Bioreactor EngineeringEast China University of Science and TechnologyShanghaiChina
  2. 2.School of BiotechnologyEast China University of Science and TechnologyShanghaiChina
  3. 3.Shanghai Collaborative Innovation Center for BiomanufacturingShanghaiChina

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