Methyl-Ester Shielded C6 Chemical Production via Enzymatic Pathways
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Solution Overview
Problem
Current methods for producing C6 building blocks like adipic acid, 6-aminohexanoic acid, hexamethylenediamine, caprolactam, and 1,6-hexanediol are not sustainable and face challenges in directing carbon flux towards these compounds due to the optimality principle, where microorganisms prioritize biomass growth over production of these chemicals.
Innovation Solution
Construction of biochemical pathways using fatty acid elongation and synthesis enzymes to form six-carbon chain aliphatic backbones from oxalyl-CoA and malonyl-CoA, with subsequent enzymatic formation of terminal functional groups such as carboxyl, amine, or hydroxyl groups, employing recombinant host cells and specific enzymes like malonyl-[acp] O-methyltransferases, β-ketoacyl-[acp] synthases, and ω-transaminases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional petrochemical methods are used to produce C6 building blocks, then production efficiency is high, but sustainability is poor and reliance on non-renewable feedstocks persists
Solution Approach 1:
The patent changes the fundamental parameter of feedstock source from petrochemical to renewable biomass, while optimizing enzymatic reaction parameters (enzyme combinations, cultivation conditions) to achieve sustainable production of C6 building blocks with high yield and productivity
Solution Approach 2:
The patent replaces conventional chemical oxidation processes with biocatalytic enzymatic pathways, using biological systems (enzymes and host cells) to perform the chemical transformations that previously required harsh chemical reagents and extreme conditions
2Object-affected harmful factors
If microorganisms are used for biocatalysis, then sustainability is improved, but the optimality principle causes microorganisms to prioritize biomass growth over chemical production
Solution Approach 1:
The patent segments the metabolic pathway into distinct enzymatic steps with specific functions (methyltransferase for chain elongation, transaminase for amine formation, etc.), allowing independent optimization of each step to direct carbon flux toward C6 building blocks while maintaining host viability
Solution Approach 2:
The patent introduces engineered enzymatic pathways as intermediaries that bridge renewable feedstocks and target C6 building blocks, using heterologous enzyme expression to redirect metabolic flux from biomass growth to chemical production
3Ease of operation
If wild-type microorganisms are used, then ease of operation is high, but they cannot naturally overproduce or excrete C6 building blocks
Solution Approach 1:
The patent performs preliminary genetic engineering of host cells to express the required enzymatic pathway before cultivation, pre-configuring the biological system to produce C6 building blocks efficiently under optimized fermentation conditions
Solution Approach 2:
The patent uses universal enzymatic pathways and host cell systems that can be applied to produce multiple different C6 building blocks (adipic acid, caprolactam, HMD, etc.) from common feedstocks, enabling flexible production of various chemical products
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
This approach allows for efficient production of C6 building blocks by overcoming the optimality principle, enabling high yields and improved host tolerance to these compounds through optimized cultivation strategies and enzyme combinations.
Implementation Method 1
enzymatically synthesizing a six carbon chain aliphatic backbone from oxalyl-CoA and either (i) acetyl-CoA or malonyl-CoA via two cycles of methyl ester shielded carbon chain elongation
Implementation Method 2
Construction of biochemical pathways using fatty acid elongation and synthesis enzymes to form six-carbon chain aliphatic backbones
Implementation Method 3
enzymatically forming one or two terminal functional groups selected from the group consisting of carboxyl, amine, and hydroxyl groups in the backbone
Data Source
AI summary
This document describes biochemical pathways for producing adipic acid, 6-aminohexanoic acid, 6-hydroxhexanoic acid, hexamethylenediamine, caprolactam, or 1,6-hexanediol by forming one or two terminal functional groups, comprised of carboxyl, amine or hydroxyl group, in a C6 aliphatic backbone substrate. These pathways, metabolic engineering and cultivation strategies described herein rely on the enzymes or homologs accepting methyl ester shielded dicarboxylic acid substrates.