Recombinant Plasmid for Lignin-Derived Muconic Acid Production
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Solution Overview
Problem
Current methods fail to effectively utilize large amounts of low molecular aromatic substances derived from lignin, other than vanillin, for industrial applications, leading to lignin being burned as a substitute for heavy oil without being fully utilized.
Innovation Solution
A recombinant plasmid containing genes for vanillate demethylase, benzaldehyde dehydrogenase, and protocatechuate 3,4-dioxygenase enzymes is used to transform bacteria, enabling a multistage enzyme reaction for the fermentative production of 3-carboxy-cis,cis-muconic acid and 3-carboxymuconolactone from vanillin, vanillic acid, and protocatechuic acid, allowing for high-yield and cost-effective production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If chemical decomposition methods are used to produce low molecular aromatic substances from lignin, then vanillin can be produced as a perfume material, but large amounts of other low molecular aromatic substances remain unused and must be burned as fuel
Solution Approach 1:
The patent applies universality by developing a fermentation system that can process multiple low molecular aromatic substances (vanillin, vanillic acid, protocatechuic acid, syringaldehyde, syringic acid) through a single engineered metabolic pathway. The recombinant microorganisms express a suite of enzymes (demethylase, dehydrogenase, dioxygenase, lyase) that collectively convert diverse substrates into valuable intermediates for functional plastics, transforming waste materials into useful chemical feedstocks and eliminating the need to burn them as fuel.
Solution Approach 2:
The patent employs parameter changes by modifying the metabolic parameters of microorganisms through genetic engineering. Specific genes are introduced and regulated to alter the biochemical transformation parameters, enabling the conversion of aromatic substances from a dead-end combustion process into a productive fermentation pathway that generates high-value chemical intermediates with controlled yield and selectivity.
2Productivity
If multiple enzymes are used for multistage fermentation process, then conversion efficiency improves, but process complexity increases
Solution Approach 1:
The patent applies merging by consolidating multiple enzyme functions into a single recombinant microorganism system. Instead of performing separate chemical reactions in different reactors with multiple purification steps, the engineered microbe internally integrates demethylase, dehydrogenase, dioxygenase, and lyase activities, allowing the multistage conversion to occur in a single bioreactor through the organism's metabolic pathway, thereby simplifying the overall process architecture.
Solution Approach 2:
The patent implements self-service by enabling the recombinant microorganism to autonomously perform the multistage enzymatic conversions. The engineered microbe expresses all necessary enzymes and self-regulates the metabolic flux through its cellular machinery, eliminating the need for external addition of multiple enzymes or complex process control systems, thus reducing operational complexity while maintaining high conversion efficiency.
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 the efficient conversion of vanillin, vanillic acid, and protocatechuic acid into 3-carboxy-cis,cis-muconic acid and 3-carboxymuconolactone, providing a valuable intermediate for functional plastics and chemical products, thereby effectively utilizing lignin-derived compounds.
Implementation Method 1
genes coding for enzymes participating in a multistage reaction process for fermentative production of 3-carboxy-cis,cis-muconic acid and/or 3-carboxymuconolactone from vanillin, vanillic acid, protocatechuic acid or combinations thereof
Implementation Method 2
fermentative production of 3-carboxy-cis,cis-muconic acid and/or 3-carboxymuconolactone
Data Source
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AI summary
There is provided a process for industrial production of simple 3-carboxy-cis,cis-muconic acid and/or 3-carboxymuconolactone from low molecular mixtures derived from plant components such as vanillin, vanillic acid and protocatechuic acid, via a multistage enzyme reaction. A recombinant plasmid containing a vanillate demethylase gene (vanAB genes), benzaldehyde dehydrogenase gene (ligV gene) and protocatechuate 3,4-dioxygenase gene (pcaHG genes); transformants incorporating the plasmid; and a process for production of 3-carboxy-cis,cis-muconic acid and/or 3-carboxymuconolactone characterized by culturing the transformants in the presence of vanillin, vanillic acid, protocatechuic acid or a mixture of two or more thereof.