C7 Building Block Synthesis via Enzymatic Carbon Chain Elongation
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Solution Overview
Problem
There is a need for sustainable and economically viable methods to produce the C7 building blocks pimelic acid, 7-hydroxyheptanoate, 7-aminoheptanoate, heptamethylenediamine, and 1,7-heptanediol, as existing petrochemical routes are not economically feasible, and wild-type microorganisms do not naturally overproduce these compounds.
Innovation Solution
The development of biochemical pathways using isolated enzymes or recombinant host cells to synthesize these C7 building blocks by constructing pathways for carbon chain elongation and forming terminal functional groups, such as carboxyl, amine, or hydroxyl groups, through enzymes associated with cyclohexane carboxylate biosynthesis or 2-aminoadipate lysine biosynthesis, allowing for the production of pimelic acid, 7-hydroxyheptanoic acid, 7-aminoheptanoic acid, and heptamethylenediamine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If petrochemical routes are used to produce C7 building blocks, then production can occur, but the method is not economically viable and unsustainable
Solution Approach 1:
The patent replaces petrochemical synthesis routes with biocatalytic pathways using enzymes and recombinant host cells. This substitution transitions from traditional chemical manufacturing to biological manufacturing, achieving economic viability through sustainable means while maintaining production capability for C7 building blocks including pimelic acid, 7-aminoheptanoic acid, and other nylon precursors
Solution Approach 2:
The patent modifies metabolic parameters in host microorganisms by introducing heterologous pathways and optimizing enzyme expression. This enables the biological system to produce C7 building blocks at economically viable levels by changing the metabolic state from natural low production to engineered high production
2Productivity
If wild-type microorganisms are used, then natural metabolism occurs, but they do not naturally overproduce or excrete C7 building blocks
Solution Approach 1:
The patent divides the C7 building block production pathway into discrete enzymatic steps and introduces them as separate heterologous genes into host microorganisms. This segmentation allows for modular optimization of each pathway component (such as beta-oxidation enzymes, thiolases, and dehydrogenases) to achieve high productivity while managing the complexity through systematic genetic engineering
Solution Approach 2:
The patent uses universal biocatalytic pathways that can be applied across multiple host organisms (bacteria, yeast, fungi) to produce the same C7 building blocks. This multi-functionality allows the engineered pathways to operate in different biological systems, achieving high productivity through standardized metabolic engineering approaches
3Productivity
If carbon flux is directed towards C7 building blocks, then production increases, but this contradicts the optimality principle as microorganisms prioritize biomass growth
Solution Approach 1:
The patent dynamically balances carbon flux between biomass production and C7 building block synthesis by regulating enzyme expression levels and pathway activity. This dynamic control allows the system to maintain reliable biomass growth while simultaneously directing sufficient carbon flux toward product formation, resolving the contradiction between productivity and biological reliability
Solution Approach 2:
The patent introduces intermediary metabolic pathways that channel carbon flux from central metabolism toward C7 building block production without completely diverting resources from biomass growth. These intermediary pathways (such as modified beta-oxidation pathways) act as mediators that enable product synthesis while maintaining the cellular functions necessary for reliable growth
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 enables efficient production of C7 building blocks by directing carbon flux and using non-natural pathways, feedstocks, and host microorganisms to overcome the limitations of the optimality principle, achieving high yields and overcoming the lack of natural production in wild-type microorganisms.
Implementation Method 1
enzymatically synthesizing a seven carbon chain aliphatic backbone using enzymes associated with cyclohexane carboxylate biosynthesis or the 2-aminoadipate lysine biosynthesis pathway
Implementation Method 2
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 pimelic acid, 7-aminoheptanoic acid, 7-hydroxyheptanoic acid, heptamethylenediamine or 1,7-heptanediol by forming two terminal functional groups, 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 carbon chain elongation enzymes or homologs thereof associated with the cyclohexane carboxylate biosynthesis from Syntrophus aciditrophicus or 2-aminoadipate lysine biosynthesis.