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Directed evolution of the 3-hydroxypropionic acid production pathway by engineering aldehyde dehydrogenase using a
Joo Yeon Seok1, Jina Yang2, Sang Jin Choi3
1School of Interdisciplinary Bioscience and Bioengineering, Pohang University of Science and Technology (POSTECH), 77 Cheongam-Ro, Nam-Gu, Pohang, Gyeongbuk 37673, Republic of Korea.
Metabolic Engineering
|March 17, 2018
Summary
Researchers engineered a biological system for producing 3-hydroxypropionic acid (3-HP) from glycerol. They developed a novel selection method to improve enzyme efficiency, enhancing 3-HP production in microorganisms.
Area of Science:
- Biotechnology
- Metabolic Engineering
- Synthetic Biology
Background:
- 3-Hydroxypropionic acid (3-HP) is a key platform chemical with significant industrial applications.
- Biological production of 3-HP from glycerol offers a promising, high-yield pathway.
- Existing biological methods face challenges due to low enzyme activity and instability.
Purpose of the Study:
- To engineer improved enzymes for 3-HP biosynthesis using directed evolution.
- To develop a synthetic selection system for screening 3-HP-producing microorganisms.
- To enhance the efficiency of glycerol dehydratase (GDHt) and aldehyde dehydrogenase (ALDH) in 3-HP production.
Main Methods:
- Construction of a synthetic selection device based on a 3-HP-responsive transcription factor.
- Application of the selection approach to an aldehyde-binding site library of alpha-ketoglutaric semialdehyde dehydrogenase (KGSADH).
- Enrichment of high-producing strains through serial cultures and isolation of improved enzyme variants.
Main Results:
- Successful enrichment of microbial strains with enhanced 3-HP production capabilities.
- Isolation of a KGSADH variant with a 2.79-fold higher catalytic efficiency compared to the wild-type enzyme.
- Demonstration of a functional directed evolution approach for pathway enzyme engineering.
Conclusions:
- The developed synthetic selection system provides an efficient tool for metabolic engineering.
- Directed evolution can effectively improve enzyme performance in 3-HP biosynthesis.
- This approach facilitates the optimization of microbial cell factories for chemical production.
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