| 초록 |
3-HP is an important platform chemical, and biological production of 3-HP from glycerol as a carbon source using glycerol dehydratase and aldehyde dehydrogenase has been revealed to be effective. Despite successful attempts of 3-HP production, biological process suffers from problems arising from low activity and inactivation of the two enzymes. To apply the directed evolution to engineer 3-HP production system, we constructed a synthetic screening device using a 3-HP-responsive transcription factor and developed a selection approach for screening. The method was applied to ALDH library, specifically aldehyde-binding site library of KGSADH. Only two serial cultures resulted in enrichment of strains showing 25% increased 3-HP production, and an isolated KGSADH variant enzyme exhibited 2.8-fold higher catalytic efficiency toward its aldehyde substrate than wild-type one. |
