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Engineering Zymomonas mobilis for Robust Cellulosic Ethanol Production
Juan Xia1, Yongfu Yang2, Chen-Guang Liu1
1State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic and Developmental Sciences, and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, China.
Trends in Biotechnology
|March 17, 2019
Summary
Zymomonas mobilis offers advantages over Saccharomyces cerevisiae for cellulosic ethanol production due to its efficient pentose metabolism and reduced cofactor imbalance. Engineering Z. mobilis enhances ethanol yield and bioprocess efficiency.
Area of Science:
- Biotechnology
- Metabolic Engineering
- Synthetic Biology
Background:
- Saccharomyces cerevisiae engineering for pentose metabolism faces cofactor imbalance, limiting cellulosic ethanol yield.
- Zymomonas mobilis presents an alternative with isomerase pathway pentose metabolism and the Entner-Doudoroff pathway, reducing ATP and biomass for higher ethanol production.
Purpose of the Study:
- To highlight recent advances in engineering Zymomonas mobilis for improved cellulosic ethanol production.
- To compare the advantages of Z. mobilis over S. cerevisiae in pentose utilization and bioprocess engineering.
Main Methods:
- Engineering Zymomonas mobilis for pentose metabolism via the isomerase pathway.
- Utilizing the Entner-Doudoroff pathway for sugar metabolism in Z. mobilis.
- Leveraging available Z. mobilis genome information and genetic tools for strain development.
Main Results:
- Z. mobilis demonstrates pentose metabolism without cofactor imbalance, unlike S. cerevisiae.
- The Entner-Doudoroff pathway in Z. mobilis leads to more sugar conversion to ethanol.
- Z. mobilis offers advantages in bioprocess engineering, including self-flocculation.
Conclusions:
- Zymomonas mobilis is a promising platform for efficient cellulosic ethanol production.
- Engineering Z. mobilis overcomes limitations associated with S. cerevisiae in pentose fermentation.
- Advances in Z. mobilis genetics and bioprocessing pave the way for industrial applications.
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