1. Directed evolution of the 3-hydroxypropionic acid production pathway by engineering aldehyde dehydrogenase using a synthetic selection device.
- Author
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Seok, Joo Yeon, Yang, Jina, Choi, Sang Jin, Lim, Hyun Gyu, Choi, Un Jong, Kim, Kyung-Jin, Park, Sunghoon, Yoo, Tae Hyeon, and Jung, Gyoo Yeol
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PROPIONIC acid , *ALDEHYDE dehydrogenase , *BIOSYNTHESIS , *MICROBIAL genetic engineering , *MICROBIAL enzymes - Abstract
3-Hydroxypropionic acid (3-HP) is an important platform chemical, and biological production of 3-HP from glycerol as a carbon source using glycerol dehydratase (GDHt) and aldehyde dehydrogenase (ALDH) has been revealed to be effective because it involves a relatively simple metabolic pathway and exhibits higher yield and productivity than other biosynthetic pathways. Despite the successful attempts of 3-HP production from glycerol, the biological process suffers from problems arising from low activity and inactivation of the two enzymes. To apply the directed evolutionary approach to engineer the 3-HP production system, we constructed a synthetic selection device using a 3-HP-responsive transcription factor and developed a selection approach for screening 3-HP-producing microorganisms. The method was applied to an ALDH library, specifically aldehyde-binding site library of alpha-ketoglutaric semialdehyde dehydrogenase (KGSADH). Only two serial cultures resulted in enrichment of strains showing increased 3-HP production, and an isolated KGSADH variant enzyme exhibited a 2.79-fold higher catalytic efficiency toward its aldehyde substrate than the wild-type one. This approach will provide the simple and efficient tool to engineer the pathway enzymes in metabolic engineering. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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