Engineered Aldehyde Dehydrogenase Variants for Renewable Butanediol
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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 is energy- and capital-intensive, necessitating the development of renewable feedstock-based methods for their production.
Innovation Solution
Engineering aldehyde dehydrogenase variants with specific amino acid alterations to enhance their catalytic specificity and activity for converting 3-hydroxybutyryl-CoA and 4-hydroxybutyryl-CoA to their respective aldehydes, which are then used in microbial organisms to produce 3-hydroxybutyraldehyde, 1,3-butanediol, and 4-hydroxybutyraldehyde, thereby facilitating the production of these chemicals from renewable resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If petroleum-based feedstocks are used to produce 1,3-butanediol and 1,4-butanediol, then the production process is established, but the process is energy-intensive and capital-intensive
Solution Approach 1:
The patent changes the fundamental parameter of feedstock source from petroleum-based to renewable-based (such as sugar, starch, or cellulosic materials). This parameter change enables the use of biological pathways and engineered microorganisms to produce butanediol and butyraldehyde, thereby reducing energy intensity and capital requirements associated with petroleum refining infrastructure.
Solution Approach 2:
The patent replaces the mechanical/chemical refining process of petroleum extraction with a biological system. Engineered microorganisms utilize enzymatic pathways (including aldehyde dehydrogenase enzymes) to convert renewable feedstocks into target chemicals through biochemical transformations, substituting the energy-intensive mechanical refining process.
2Productivity
If conventional aldehyde dehydrogenase is used, then the basic conversion function is provided, but the catalytic specificity and activity for converting 3-hydroxybutyryl-CoA and 4-hydroxybutyryl-CoA to aldehydes is insufficient
Solution Approach 1:
The patent applies local quality by introducing specific amino acid mutations at particular positions in the aldehyde dehydrogenase enzyme sequence. These localized changes in the enzyme's active site or structural regions enhance its catalytic specificity for substrates like 3-hydroxybutyryl-CoA and 4-hydroxybutyryl-CoA, while maintaining overall enzyme functionality.
Solution Approach 2:
The patent changes the enzyme's catalytic parameters by modifying its amino acid sequence. Specific mutations alter the enzyme's kinetic parameters (such as Km and kcat) to improve its affinity and catalytic efficiency for specific substrates, thereby enhancing both productivity and manufacturing precision.
3Use of energy by moving object
If renewable feedstocks are used, then energy intensity is reduced, but the production yield and efficiency need to be enhanced
Solution Approach 1:
The patent incorporates feedback mechanisms through metabolic pathway engineering. The engineered microorganisms are designed with regulated metabolic fluxes that feedback-responsive control mechanisms to optimize the conversion of renewable feedstocks into target chemicals, ensuring high production yields while maintaining low energy intensity.
Solution Approach 2:
The patent creates a composite biological system by combining multiple engineered enzymes and metabolic pathways within a single microorganism. This composite enzymatic system optimizes the conversion of renewable feedstocks, achieving both high productivity and energy efficiency through synergistic interactions between different biochemical steps.
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 significantly increase the yield of 3-hydroxybutyraldehyde and 1,3-butanediol, or their esters/amides, in microbial organisms, offering a renewable and less energy-intensive process for producing valuable chemicals.
Implementation Method 1
catalyzing the conversion of 3-hydroxybutyryl-CoA to 3-hydroxybutyraldehyde
Implementation Method 2
catalyzing the conversion of 4-hydroxybutyryl-CoA to 4-hydroxybutyraldehyde
Implementation Method 3
producing a bioderived compound such as 3-hydroxybutyraldehyde, 1,3-butanediol, 4-hydroxybutyraldehyde, and 1,4-butanediol
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.