Biosynthesizing 5 and 7-Carbon Monomers via Enzymatic Pathways
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Solution Overview
Problem
There is a lack of economically viable petrochemical routes for producing monomers for Nylon 7 and Nylon 7,7, necessitating the development of sustainable biocatalytic methods to synthesize pimelic acid, 7-hydroxyheptanoic acid, 7-aminoheptanoic acid, heptamethylenediamine, and 1,7-heptanediol.
Innovation Solution
The use of β-ketothiolase and other enzymes to biosynthesize 5 and 7 carbon monomers through biochemical pathways, converting 3-oxo-7-hydroxyheptanoyl-CoA to 7-hydroxyheptanoate, and subsequently to pimelic acid, 7-aminoheptanoic acid, heptamethylenediamine, or 1,7-heptanediol, utilizing host microorganisms with exogenous nucleic acids encoding specific enzymes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If biocatalytic methods are used to produce monomers for Nylon 7 and Nylon 7,7, then sustainability and economic viability are improved, but production complexity increases due to the need for multiple enzymatic steps and host microorganism engineering
Solution Approach 1:
The production process is divided into distinct enzymatic steps, each catalyzed by a specific enzyme (β-ketothiolase, 3-hydroxyacyl-CoA dehydrogenase, 3-oxoacyl-CoA reductase, enoyl-CoA hydratase, trans-2-enoyl-CoA reductase, thioesterase). This segmentation allows each step to be optimized independently and facilitates modular process design, making the complex biocatalytic pathway more manageable and economically viable.
Solution Approach 2:
Host microorganisms are engineered to express multiple exogenous enzymes that perform different functions in the biosynthetic pathway. The host cell serves as a universal platform that can produce various monomers (7-hydroxyheptanoic acid, pimelic acid, 7-aminoheptanoic acid, heptamethylenediamine, 1,7-heptanediol) through coordinated expression of multiple enzymes, reducing the need for separate production systems.
2Adaptability or versatility
If multiple enzymes are used in the biosynthetic pathway, then product diversity (pimelic acid, 7-aminoheptanoic acid, heptamethylenediamine, 1,7-heptanediol) is improved, but process complexity and purification difficulty increase
Solution Approach 1:
The biosynthetic pathway is designed to produce intermediates in a predetermined sequence, with each enzyme acting on its specific substrate to generate the next intermediate. This preliminary organization of the pathway ensures that all necessary enzymes and cofactors are in place before final product formation, facilitating easier separation and purification of target monomers from intermediates.
Solution Approach 2:
Common intermediates such as 3-oxo-7-hydroxyheptanoyl-CoA serve as mediators that connect different branch pathways leading to diverse final products. By controlling the activity of downstream enzymes (thioesterase, transaminase, reductase), the same intermediate can be directed toward different monomer products, simplifying the overall process architecture while maintaining product diversity.
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 provides an economically viable and sustainable method for producing these monomers, enhancing the efficiency and sustainability of Nylon production by leveraging biocatalysis and microbial engineering.
Implementation Method 1
enzymatically converting 5-hydroxypentanoyl-CoA to 3-oxo-7-hydroxyheptanoyl-CoA using a β-ketothiolase
Implementation Method 2
converting 3-oxo-7-hydroxyheptanoyl-CoA to 7-hydroxyheptanoic acid using one or more of an isolated 3-hydroxyacyl-CoA dehydrogenase
Implementation Method 3
converting 3-oxo-7-hydroxyheptanoyl-CoA to 7-hydroxyheptanoic acid using one or more of an isolated 3-oxoacyl-CoA reductase
Implementation Method 4
converting 3-oxo-7-hydroxyheptanoyl-CoA to 7-hydroxyheptanoic acid using one or more of an isolated enoyl-CoA hydratase
Implementation Method 5
converting 3-oxo-7-hydroxyheptanoyl-CoA to 7-hydroxyheptanoic acid using one or more of a trans-2-enoyl-CoA reductase
Implementation Method 6
converting 3-oxo-7-hydroxyheptanoyl-CoA to 7-hydroxyheptanoic acid using one or more of a thioesterase
Data Source
AI summary
This document describes biochemical pathways for biosynthesizing a 3-oxo-7-hydroxyheptanoyl-CoA intermediate using a β-ketothiolase, and enzymatically converting 3-oxo-7-hydroxyheptanoyl-CoA to 7-hydroxyheptanoic acid. —7-hydroxyheptanoic acid can be further enzymatically converted to pimelic acid, 7-aminoheptanoic acid, heptamethylenediamine or 1,7-heptanediol. This document also describes recombinant hosts producing 7-hydroxyheptanoic acid as well as pimelic acid, 7-aminoheptanoic acid, heptamethylenediamine and 1,7-heptanediol.