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Increasing oxygen availability for improving poly(3-hydroxybutyrate) production by Halomonas.

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Engineering bacteria with Vitreoscilla hemoglobin (VHb) in their periplasm significantly boosts cell density by 100%. This method enhances oxygen availability for industrial biotechnology, overcoming fermentation limitations.

Keywords:
FermentationHalomonasHalomonas bluephagenesisHigh cell densityPHBPolyhydroxyalkanoatesSynthetic biologyTat pathwayvgb

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Area of Science:

  • Biotechnology
  • Microbial Engineering
  • Bioprocess Optimization

Background:

  • High-cell-density fermentation is crucial for economical biotechnological product manufacturing.
  • Oxygen availability limits cell density in late-stage fermentation.
  • Bacterial Vitreoscilla hemoglobin (VHb) improves oxygen supply, but cell membrane contact is inefficient.

Purpose of the Study:

  • To enhance oxygen availability in microbial fermentation by engineering VHb expression.
  • To investigate the use of the twin-arginine translocase (Tat) pathway for periplasmic VHb delivery.
  • To develop a novel promoter system for microaerobic VHb and PHB synthesis gene expression.

Main Methods:

  • Utilized the twin-arginine translocase (Tat) pathway to export active VHb into the periplasm of Escherichia coli and Halomonas spp.
  • Constructed a strong promoter cassette (P8vgb) using eight tandem low-oxygen-inducible vgb promoters.
  • Co-expressed VHb and the PHB synthesis operon under the control of the P8vgb promoter.

Main Results:

  • Achieved a 100% increase in cell growth by exporting active VHb into the periplasm via the Tat pathway.
  • Demonstrated the universal applicability of the Tat pathway and VHb expression in E. coli and two Halomonas species.
  • The P8vgb promoter cassette effectively induced microaerobic expression of VHb and the PHB synthesis operon.

Conclusions:

  • Periplasmic VHb delivery using the Tat pathway is a highly effective strategy for enhancing microbial cell density.
  • The developed P8vgb promoter system is suitable for microaerobic gene expression in various bacterial hosts.
  • This approach offers a universal solution for improving oxygen availability and fermentation efficiency in industrial biotechnology.