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Genetic Engineering of an Unconventional Yeast for Renewable Biofuel and Biochemical Production
Published on: September 20, 2016
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Engineering Yarrowia lipolytica for poly-3-hydroxybutyrate production
Zheng-Jun Li1,2, Kangjian Qiao1, Nian Liu1
1Department of Chemical Engineering, Massachusetts Institute of Technology, Room 56-469, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA.
Journal of Industrial Microbiology & Biotechnology
|November 10, 2016
Summary
Engineered Yarrowia lipolytica successfully produced poly-3-hydroxybutyrate (PHB). This yeast strain shows potential for cost-effective biopolymer production using low-cost carbon sources like acetate.
Area of Science:
- Biotechnology
- Microbial Engineering
- Polymer Science
Background:
- Yarrowia lipolytica is a robust yeast with a known capacity for lipid production.
- Acetyl-CoA is a key precursor for both lipid and poly-3-hydroxybutyrate (PHB) biosynthesis.
- Efficient microbial production of PHB is crucial for sustainable bioplastics.
Purpose of the Study:
- To engineer Yarrowia lipolytica for the biosynthesis of poly-3-hydroxybutyrate (PHB).
- To evaluate PHB accumulation in engineered strains using different carbon sources.
- To assess the potential of Y. lipolytica as a host for industrial PHB production.
Main Methods:
- Cloning and chromosomal integration of genes encoding the PHB biosynthetic pathway (β-ketothiolase, NADPH-dependent acetoacetyl-CoA reductase, PHB synthase).
- Cultivation of engineered Y. lipolytica in shake flasks with glucose and acetate.
- Fed-batch fermentation using acetate as the sole carbon source.
Main Results:
- Engineered Y. lipolytica accumulated PHB to 1.50% (glucose) and 3.84% (acetate) of cell dry weight in shake flasks.
- Fed-batch fermentation achieved 7.35 g/l PHB, representing 10.2% of cell dry weight.
- The yeast's natural lipid production capability suggests efficient acetyl-CoA supply for PHB synthesis.
Conclusions:
- Yarrowia lipolytica can be successfully engineered for PHB production.
- Acetate is a more effective carbon source than glucose for PHB accumulation in this strain.
- This study highlights the potential of Y. lipolytica for sustainable and cost-effective poly-3-hydroxybutyrate bioproduction.
