Aldehyde Dehydrogenase Variants for Hydroxybutyryl-CoA Conversion
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Solution Overview
Problem
The reliance on petroleum-based feedstocks for producing commodity chemicals like 1,3-butanediol and 1,4-butanediol necessitates the development of renewable feedstock-based methods to reduce energy and capital intensity in their production.
Innovation Solution
Engineering aldehyde dehydrogenase variants with specific amino acid alterations to enhance the conversion of 3-hydroxybutyryl-CoA and 4-hydroxybutyryl-CoA to their respective aldehydes, which are then used in non-naturally occurring microbial organisms to produce 3-hydroxybutyraldehyde, 1,3-butanediol, and 4-hydroxybutyraldehyde, thereby facilitating the production of these chemicals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If petroleum-based feedstocks are used for producing 1,3-butanediol and 1,4-butanediol, then production efficiency is maintained, but energy consumption and capital intensity increase
Solution Approach 1:
The patent changes the fundamental parameter of feedstock type from petroleum-based to renewable-based, and modifies enzyme parameters through amino acid substitutions to optimize catalytic activity for the new feedstock pathway, thereby reducing energy consumption while maintaining productivity
Solution Approach 2:
The patent replaces conventional chemical catalysis with engineered biological enzymes (aldehyde dehydrogenase variants) to catalyze the conversion of hydroxybutyryl-CoA to aldehydes, providing a more energy-efficient pathway compared to traditional petroleum-based chemical processes
2Productivity
If conventional aldehyde dehydrogenase is used, then the conversion reaction occurs, but the yield of 3-hydroxybutyraldehyde and 1,3-butanediol is insufficient
Solution Approach 1:
The patent introduces specific local modifications (amino acid substitutions at positions 435 and/or 442) in the aldehyde dehydrogenase enzyme structure to enhance its catalytic activity and substrate specificity, thereby improving the yield and conversion efficiency of the desired products
Solution Approach 2:
The patent changes the enzymatic parameters through site-directed mutagenesis, creating variants with optimized kinetic properties for the conversion of 3-hydroxybutyryl-CoA to 3-hydroxybutyraldehyde, resulting in at least 10% higher yield compared to control organisms
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The engineered aldehyde dehydrogenases increase the yield of 3-hydroxybutyraldehyde and 1,3-butanediol or 4-hydroxybutyraldehyde by at least 10% compared to control organisms, providing a renewable and efficient route for producing these valuable chemicals.
Implementation Method 1
aldehyde dehydrogenase variants with specific amino acid alterations to enhance the conversion of 3-hydroxybutyryl-CoA and 4-hydroxybutyryl-CoA to their respective aldehydes
Data Source
AI summary
The disclosure provides polypeptides and encoding nucleic acids of engineered aldehyde dehydrogenases. The disclosure also provides cells expressing an engineered form of the aldehyde dehydrogenase. The disclosure further provides methods for producing a bioderived compound, such as 3-hydroxybutyraldehyde, 1,3-butanediol, 4-hydroxybutyraldehyde, 1,4-butanediol, comprising culturing cells expressing an engineered aldehyde dehydrogenase.