Microbial α-Hydromuconic Acid Production via Metabolic Pathway
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Solution Overview
Problem
There is no effective method for producing α-hydromuconic acid using a metabolic pathway in microorganisms, as previous attempts lacked direct evidence and were hindered by the unknown nature of the enzyme 3-hydroxyadipate dehydratase, and reported productivity was very low.
Innovation Solution
Identifying and culturing specific microorganisms such as Escherichia, Pseudomonas, Bacillus, and others that naturally produce α-hydromuconic acid, using a medium with suitable carbon sources and inducers like ferulic acid to activate the metabolic pathway for efficient production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If 3-hydroxyadipic acid is dehydrated by enzymatic reaction using 3-hydroxyadipate dehydratase, then α-hydromuconic acid can be produced, but the enzyme is not well known and no direct evidence for the dehydration reaction has been found
Solution Approach 1:
The patent uses 3-hydroxyadipic acid as an intermediary substance to establish the metabolic pathway. By demonstrating that 3-hydroxyadipic acid is produced from succinic and acetyl CoA, and then dehydrated to form α-hydromuconic acid, the patent provides indirect evidence for enzyme activity without requiring direct detection of the dehydratase enzyme itself.
Solution Approach 2:
The patent performs preliminary identification of the metabolic pathway components before attempting to produce α-hydromuconic acid. By first establishing that 3-hydroxyadipic acid accumulates as an intermediate and can be converted to the target product, the patent creates a reliable foundation for subsequent production efforts.
2Adaptability or versatility
If a non-naturally occurring microorganism is used to produce α-hydromuconic acid through metabolic pathway, then production is theoretically possible, but no direct evidence confirms actual production capability
Solution Approach 1:
The patent uses 3-hydroxyadipic acid as a marker intermediate to confirm that the metabolic pathway is functional in the microorganism. By detecting the presence and conversion of this intermediary compound, the patent provides reliable evidence that α-hydromuconic acid production is actually occurring, rather than just theorizing based on pathway reconstruction.
3Productivity
If α-hydromuconic acid is produced by naturally occurring microorganism degradation of adipic acid, then production occurs, but productivity is very low at 0.86 mg/L over 17 days
Solution Approach 1:
Instead of allowing microorganisms to degrade adipic acid to produce α-hydromuconic acid (the natural but slow pathway), the patent inverts the approach by having microorganisms synthesize α-hydromuconic acid through a constructed metabolic pathway using succinic and acetyl CoA as starting materials. This reverses the metabolic flow to achieve much higher productivity.
Solution Approach 2:
The patent performs preliminary engineering of the metabolic pathway by introducing or overexpressing specific enzymes (such as 3-hydroxyadipate dehydratase) before production. This preparatory action ensures that when substrate is provided, the pathway is already optimized for rapid conversion, achieving high productivity within 20-48 hours rather than 17 days.
4Ease of manufacture
If metabolic pathway engineering is attempted without confirmed enzyme knowledge, then production method development is hindered, but extensive research time and resources are required
Solution Approach 1:
The patent uses 3-hydroxyadipic acid as a detectable intermediary that serves as a proxy for confirming pathway functionality. By monitoring this intermediate compound rather than requiring detailed knowledge of each enzyme's properties, the patent accelerates method development while maintaining scientific rigor.
Solution Approach 2:
The patent allows the metabolic pathway to serve itself by using the natural accumulation and conversion of 3-hydroxyadipic acid as an built-in indicator of pathway activity. This self-monitoring approach eliminates the need for extensive external characterization of enzyme activities, reducing research time and resources.
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 method enables the production of α-hydromuconic acid using a metabolic pathway in microorganisms, achieving productivity levels of at least 1.0 mg/L within 20-48 hours, with specific microorganisms like Cupriavidus metallidurans and Pseudomonas putida demonstrating high yields.
Implementation Method 1
a microorganism having a capacity to produce α-hydromuconic acid... culturing at least one type of microorganism having a capacity to produce α-hydromuconic acid
Data Source
AI summary
A method of producing α-hydromuconic acid using a metabolic pathway of a microorganism is disclosed. The method of producing α-hydromuconic acid includes the step of culturing at least one type of microorganism having a capacity to produce α-hydromuconic acid, selected from the group consisting of microorganisms belonging to the genus Escherichia, microorganisms belonging to the genus Pseudomonas, microorganisms belonging to the genus Hafnia, microorganisms belonging to the genus Bacillus, microorganisms belonging to the genus Cupriavidus, microorganisms belonging to the genus Acinetobacter, microorganisms belonging to the genus Alcaligenes, microorganisms belonging to the genus Delftia, and microorganisms belonging to the genus Shimwellia.