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Methanol Independent Expression by Pichia Pastoris Employing De-repression Technologies
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Efficient Development of a Mixed Feed Process for Pichia pastoris.

David Johannes Wurm1, Oliver Spadiut2

  • 1Institute of Chemical, Environmental and Bioscience Engineering, Research Division Biochemical Engineering, Vienna University of Technology (TU Wien), Vienna, Austria.

Methods in Molecular Biology (Clifton, N.J.)
|February 10, 2019
PubMed
Summary

This study presents a single-experiment strategy to optimize recombinant protein production in Pichia pastoris. It enables efficient mixed substrate feeding for enhanced yeast bioprocess productivity by determining strain-specific parameters.

Keywords:
Dynamic fed-batch strategyMethanol pulsePichia pastorisSpecific substrate uptake rateStrain characterization

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Area of Science:

  • Biotechnology
  • Microbial Physiology
  • Industrial Fermentation

Background:

  • Pichia pastoris is a key host for recombinant protein production.
  • The alcohol oxidase promoter (PAOX1) is widely used but requires specific induction strategies.
  • Current two-phase cultivation (growth then methanol induction) limits productivity due to poor cell growth on methanol.

Purpose of the Study:

  • To develop an efficient strategy for optimizing mixed substrate feeding in Pichia pastoris fed-batch cultivations.
  • To determine essential strain-specific parameters for high-yield recombinant protein production.
  • To avoid methanol accumulation and maximize bioprocess productivity.

Main Methods:

  • Development of a single-experiment strategy to determine optimal mixed feed parameters.
  • Characterization of yeast strain physiology under mixed substrate conditions.
  • Application of determined parameters in fed-batch cultivations.

Main Results:

  • An efficient method was established to determine parameters for mixed substrate feeding.
  • The strategy allows for precise control of fed-batch cultivations.
  • This approach facilitates higher recombinant protein yields compared to traditional methods.

Conclusions:

  • A novel, efficient strategy enables the optimization of mixed substrate feeding for Pichia pastoris.
  • This method simplifies the setup of fed-batch cultivations for enhanced productivity.
  • Strain-specific parameter determination is crucial for maximizing recombinant protein production in industrial biotechnology.