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Engineering Ashbya gossypii for efficient biolipid production.

Rodrigo Ledesma-Amaro1, Patricia Lozano-Martínez, Alberto Jiménez

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Ashbya gossypii, a fungus used for riboflavin production, can be engineered for high lipid accumulation. Blocking beta-oxidation via AgPOX1 gene knockout yields microbial oils comparable to oleaginous organisms.

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Area of Science:

  • Biotechnology
  • Microbial Engineering
  • Industrial Microbiology

Background:

  • Ashbya gossypii is a filamentous fungus known for natural riboflavin overproduction.
  • Engineered strains are industrially used for riboflavin production, replacing chemical synthesis.
  • A. gossypii offers advantages like low-cost media and simpler downstream processing.

Purpose of the Study:

  • To engineer the metabolism of A. gossypii for increased total lipid accumulation.
  • To explore A. gossypii as a host for microbial oil production.
  • To leverage available genomic and molecular tools for metabolic engineering.

Main Methods:

  • Metabolic engineering of A. gossypii.
  • Gene knockout of the AgPOX1 gene to block the beta-oxidation pathway.
  • Analysis of lipid accumulation in engineered strains.

Main Results:

  • Blocking the beta-oxidation pathway was sufficient to significantly increase lipid yields.
  • Engineered strains achieved lipid yields comparable to established oleaginous microorganisms.
  • The resulting poxΔ strain demonstrates potential for microbial oil production.

Conclusions:

  • The engineered poxΔ strain of A. gossypii is a promising new platform for microbial oil production.
  • Metabolic engineering, specifically blocking beta-oxidation, effectively enhances lipid accumulation in A. gossypii.
  • This work expands the biotechnological applications of A. gossypii beyond riboflavin production.