C1 Elongation Enzymes for C7 Building Block Synthesis
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Solution Overview
Problem
There is a need for economically viable methods to produce the C7 building blocks pimelic acid, 7-aminoheptanoic acid, heptamethylenediamine, and 1,7-heptanediol, as existing petrochemical routes are not economically feasible, and biotechnology offers an alternative through biocatalysis, but natural microorganisms do not efficiently produce these compounds, contradicting the optimality principle of maximizing biomass growth.
Innovation Solution
Constructing biochemical pathways using C1 elongation enzymes associated with the Coenzyme B biosynthesis pathway of methanogens, combining non-natural pathways, host microorganisms, attenuation strategies, and cultivation techniques to enzymatically synthesize these compounds from 2-oxoglutarate or 2-oxoadipate, forming a seven-carbon aliphatic backbone and adding terminal functional groups such as carboxyl, amine, or hydroxyl groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If biocatalysis is used to produce C7 building blocks, then economic viability is improved, but natural microorganisms do not efficiently produce these compounds
Solution Approach 1:
The patent segments the C7 building block production pathway into multiple enzymatic steps, each catalyzed by a specific enzyme (e.g., CoA ligase for pimelate activation, transaminase for amino group introduction, reductase for hydroxyl group formation). This segmentation allows optimization of each step independently and enables modular pathway construction in recombinant hosts.
Solution Approach 2:
The patent uses recombinant host cells as intermediaries to express the required enzymatic pathway. The host cell serves as a factory that converts readily available substrates (oxoglutarate or oxadipate) into C7 building blocks through the expressed enzymatic cascade, bridging the gap between natural metabolism and desired product synthesis.
2Productivity
If carbon flux is redirected towards C7 building blocks, then production yield is improved, but biomass growth is reduced due to the optimality principle
Solution Approach 1:
The patent employs preliminary metabolic engineering of the host cell to establish the enzymatic pathway before substrate introduction. The recombinant host is pre-equipped with the necessary enzymes (CoA ligase, dehydratase, hydratase, transaminase, reductase) so that when oxoglutarate or oxadipate is provided, the C7 pathway operates efficiently from the start, maximizing yield while minimizing metabolic burden.
Solution Approach 2:
The patent changes key metabolic parameters by introducing heterologous enzymes with optimized activities. The expressed enzymes have specific kinetic properties that favor C7 building block production over native pathways, effectively altering the metabolic landscape to redirect carbon flux toward the desired products despite the optimality principle.
3Adaptability or versatility
If heterologous pathways are expressed in host organisms, then C7 building block synthesis is achieved, but production performance falls short compared to native producers
Solution Approach 1:
The patent employs a universal set of enzymatic reactions (CoA ligation, dehydration, hydration, transamination, reduction) that can process both oxoglutarate and oxadipate substrates to produce C7 building blocks. This multi-functional pathway design allows flexibility in substrate selection while maintaining high production performance through optimized enzyme expression levels and activities in the recombinant host.
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 C7 building blocks by redirecting carbon flux, overcoming the optimality principle and achieving high yields, as demonstrated by specific enzyme activities and recombinant host capabilities.
Implementation Method 1
Biocatalysis is the use of biological catalysts, such as enzymes, to perform biochemical transformations of organic compounds
Data Source
AI summary
This document describes biochemical pathways for producing pimelic acid, 7-aminoheptanoic acid, 7-hydroxyheptanoic acid, heptamethylenediamine or 1,7-heptanediol by forming one or two terminal functional groups, each comprised of carboxyl, amine or hydroxyl group, in a C7 aliphatic backbone substrate. These pathways, metabolic engineering and cultivation strategies described herein rely on the C1 elongation enzymes or homolog associated with coenzyme B biosynthesis.