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Updated: Feb 4, 2026

Genetic Engineering of an Unconventional Yeast for Renewable Biofuel and Biochemical Production
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Engineering Yarrowia lipolytica for high-level ergosterol production.

Xinyu Liu1,2, Qihang Chen1,2, Wenbao Zhao1,2

  • 1Science Center for Future Foods, Jiangnan University, Wuxi 214122, China.

Synthetic and Systems Biotechnology
|February 2, 2026
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Summary

This study enhanced ergosterol production by optimizing key enzymes and engineering cellular pathways. The comprehensive strategy achieved a record 4.58 g/L titer, advancing steroid precursor synthesis.

Keywords:
Enzyme engineeringErg11ErgosterolMetabolic engineeringYarrowia lipolytica

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Area of Science:

  • Biotechnology
  • Metabolic Engineering
  • Synthetic Biology

Background:

  • Ergosterol is a vital precursor for steroid drug synthesis.
  • Optimizing ergosterol production is crucial for pharmaceutical applications.

Purpose of the Study:

  • To systematically enhance ergosterol synthesis pathway.
  • To develop a comprehensive hierarchical strategy for high-level sterol production.

Main Methods:

  • Identified and overexpressed rate-limiting enzymes (IDI1, tHMG1, ERG4, ERG5, ERG27, ERG1, ERG11).
  • Utilized molecular dynamics for enzyme engineering (S372V Erg11 mutation).
  • Introduced artificial proton-dependent pathways and employed lipid droplet engineering.

Main Results:

  • Achieved an initial ergosterol titer of 94.2 mg/L through combinatorial gene overexpression.
  • Increased titer to 124 mg/L with enzyme and pathway engineering.
  • Reached a final titer of 4.58 g/L via multi-copy gene integration and fed-batch fermentation.

Conclusions:

  • A hierarchical strategy combining genetic engineering and fermentation significantly boosts ergosterol production.
  • This work provides a robust platform for industrial-scale sterol synthesis.
  • The developed methods are applicable to other valuable metabolite production pathways.