ω-Transaminase Engineering for Aminated Aliphatic Production
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Solution Overview
Problem
The in vivo biosynthesis of carbon-based products using transamination reactions catalyzed by ω-transaminases is limited by equilibrium thermodynamics, product inhibition, and poor substrate tolerance, hindering the production of aminated aliphatic compounds with carbon chain lengths of C5-C19.
Innovation Solution
Altering the reaction conditions of transamination reactions catalyzed by ω-transaminases, including amino acid substitutions and changes in substrate specificity, to enhance the production of aminated aliphatic compounds like 7-AHA and 6-aminohexanoic acid, by optimizing the enzymatic activity and substrate specificity of ω-transaminases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transamination reactions are used for in vivo biosynthesis of carbon-based products, then biochemical pathways can be constructed to produce aminated aliphatic compounds, but equilibrium thermodynamics limits the reaction efficiency and product yield
Solution Approach 1:
The patent applies parameter changes by modifying reaction conditions including pH, temperature, and substrate concentration to shift the equilibrium position of transamination reactions. It also employs amino acid substitutions in the ω-transaminase enzyme to alter catalytic properties and improve reaction efficiency, directly addressing the equilibrium thermodynamics limitation.
2Productivity
If ω-transaminase is used to catalyze transamination reactions, then aminated aliphatic compounds can be produced, but product inhibition reduces the overall yield
Solution Approach 1:
The patent employs product removal strategies by extracting the aminated aliphatic compound products from the reaction system continuously or periodically. This prevents product accumulation and reduces product inhibition effects on the ω-transaminase enzyme, thereby maintaining higher reaction rates and improving overall product yield.
3Adaptability or versatility
If transamination reactions are implemented in vivo, then biosynthetic pathways can be established, but poor substrate tolerance of ω-transaminase limits the scope of producible compounds
Solution Approach 1:
The patent achieves universality by engineering ω-transaminase enzymes with broad substrate specificity through amino acid substitutions. The modified enzymes can catalyze transamination reactions with various substrates including different chain length fatty acid derivatives, enabling production of multiple aminated aliphatic compounds (C5-C19) from a single enzyme system.
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
Increases the yield of aminated aliphatic compounds by enhancing enzymatic activity and substrate specificity, leading to improved production efficiencies and product yields.
Implementation Method 1
ω-TAMs are key enzymes that catalyze the conversion of substrates into products, for example, the conversion of pimelate semialdehyde into 7-AHA, using an amino donor, by catalyzing the exchange of the keto group (═O) on the pimelate semialdehyde with an amine group (NH2).
Data Source
AI summary
This disclosure relates to strategies for in vivo production of certain carbon-based products, for example, aminated aliphatic compounds having a carbon chain length of C5-C19.