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Related Experiment Videos

Stress in recombinant protein producing yeasts.

Diethard Mattanovich1, Brigitte Gasser, Hubertus Hohenblum

  • 1Institute of Applied Microbiology, BOKU--University of Natural Resources and Applied Life Sciences, Muthgasse 18, A-1190 Vienna, Austria. d.mattanovich@iam.boku.ac.at

Journal of Biotechnology
|September 24, 2004
PubMed
Summary

High-level foreign protein production in yeast triggers cellular stress responses, impacting industrial fermentation. Understanding these stress factors is crucial for optimizing recombinant protein yield and cell health.

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Area of Science:

  • Biotechnology
  • Molecular Biology
  • Cellular Stress Response

Background:

  • Heterologous protein overexpression induces cellular stress, limiting production in recombinant yeast.
  • The unfolded protein response (UPR) and ER-associated degradation (ERAD) are key stress pathways affecting protein folding and secretion.
  • Industrial fermentation conditions (high cell density, osmotic stress, pH, temperature) deviate from natural environments, exacerbating cellular stress.

Purpose of the Study:

  • To investigate the impact of cellular stress responses on industrial recombinant protein production in yeast.
  • To highlight the gap in knowledge regarding cell engineering for general stress sensitivity in bioprocesses.
  • To discuss known and speculative stress-related phenomena in yeast protein production.

Main Methods:

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  • Review and discussion of established knowledge on yeast stress responses (UPR, ERAD).
  • Analysis of cellular limitations caused by high-level protein expression.
  • Consideration of environmental factors in high cell density fermentation.

Main Results:

  • High protein expression levels directly or indirectly induce cellular stress, limiting production.
  • Endoplasmic reticulum folding limitations can lead to ERAD, impacting protein yield.
  • Current metabolic engineering primarily focuses on protein folding/secretion, with limited focus on general stress resistance.

Conclusions:

  • Cellular stress responses significantly impact heterologous protein production efficiency in yeast.
  • Addressing general stress sensitivity through cell engineering is essential for improving industrial bioprocesses.
  • Further research into stress pathways, quorum sensing, and apoptosis could enhance recombinant protein production strategies.