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Phytate utilization by genetically engineered lysine-producing Corynebacterium glutamicum.

Mladen V Tzvetkov1, Wolfgang Liebl

  • 1Institut für Mikrobiologie und Genetik, Georg-August-Universität, Göttingen, Germany.

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|April 1, 2008
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Summary
This summary is machine-generated.

Corynebacterium glutamicum can now grow using phytate as its sole phosphorus source, thanks to the expression of a phytase gene. This breakthrough supports sustainable phosphorus utilization in microbial fermentation.

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Area of Science:

  • Biotechnology
  • Microbial Physiology
  • Biochemistry

Background:

  • Phytate (myo-inositol-1,2,3,4,5,6-hexakisphosphate) is a major phosphorus storage compound in plants.
  • Its low solubility and inability to be utilized by many microorganisms limit phosphorus availability.
  • Efficient microbial phosphorus acquisition is crucial for industrial fermentation processes.

Purpose of the Study:

  • To engineer Corynebacterium glutamicum for growth using phytate as the sole phosphorus source.
  • To assess the impact of phytate utilization on l-lysine production.
  • To investigate the role and secretion of heterologously expressed phytase (phyC).

Main Methods:

  • Heterologous expression of the Bacillus amyloliquefaciens DSM 7 phytase gene (phyC) in C. glutamicum ATCC 21253.
  • Cultivation of engineered C. glutamicum with phytate as the sole phosphorus source.
  • Monitoring of inorganic phosphate levels and l-lysine production during fermentation.
  • Comparison with control strains grown in phosphate-rich media.

Main Results:

  • Engineered C. glutamicum successfully grew using phytate as the sole phosphorus source.
  • Phytate degradation yielded transient inorganic phosphate, which was fully assimilated.
  • Growth and l-lysine production were comparable to controls in excess inorganic phosphate, indicating no phosphate limitation.
  • Partial secretion of phytase did not significantly impact fermentation performance.

Conclusions:

  • Heterologous expression of phyC enables C. glutamicum to utilize phytate for growth, offering a sustainable phosphorus source.
  • Phytate can serve as an effective phosphorus source for industrial amino acid production without limiting growth or yield.
  • The engineered strain demonstrates robust l-lysine production, highlighting the potential of phytase technology in biotechnology.