Microorganism Fermenting CO2 to 2-Phenylethanol
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Solution Overview
Problem
Current methods for producing 2-phenylethanol rely on natural sources or chemical synthesis, which are inefficient and dependent on fossil carbon, failing to adequately address the need for sustainable production methods.
Innovation Solution
A microorganism is engineered to produce 2-phenylethanol by expressing heterologous enzymes that convert phenylpyruvate to phenylacetaldehyde and phenylacetaldehyde to 2-phenylethanol, using substrates like CO, CO2, and H2 through gas fermentation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If 2-phenylethanol is produced from natural sources or chemical synthesis, then production is achieved, but dependence on fossil carbon and natural sources remains and sustainability is compromised
Solution Approach 1:
The patent changes the fundamental parameter of carbon source from fossil-based to biologically fixed gaseous carbon (CO2, CO). By engineering microorganisms to utilize gaseous substrates through the Wood-Ljungdahl pathway, the system transforms the carbon source parameter to achieve both productivity and sustainability goals simultaneously
Solution Approach 2:
The engineered microorganisms perform self-service by autonomously converting gaseous carbon substrates into 2-phenylethanol through metabolic pathways. The system uses naturally occurring biological processes (Wood-Ljungdahl pathway, shikimate pathway) that have been genetically optimized, eliminating dependence on external fossil carbon inputs while maintaining high production efficiency
2Adaptability or versatility
If heterologous enzymes are introduced to enable de novo biosynthesis of 2-phenylethanol from gaseous substrates, then sustainability is improved, but device complexity increases
Solution Approach 1:
The patent employs universal metabolic pathways that serve multiple functions: the Wood-Ljungdahl pathway not only fixes carbon but also generates acetyl-CoA for the shikimate pathway; the shikimate pathway produces both aromatic amino acids and phenylpyruvate intermediates. This multi-functionality reduces the need for separate dedicated systems, thereby managing complexity while achieving sustainability
Solution Approach 2:
The patent uses phenylpyruvate as a key intermediary metabolite that connects the shikimate pathway to the final 2-phenylethanol production pathway. This intermediary allows the system to leverage existing metabolic networks rather than creating entirely new pathways, thus reducing overall system complexity while enabling the desired sustainable production
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 de novo biosynthesis of 2-phenylethanol, reducing dependence on natural and petrochemical processes, and has the potential to significantly displace fossil carbon use in chemical production.
Implementation Method 1
a Wood-Ljungdahl microorganism... a Wood-Ljungdahl pathway that converts CO, CO2, and/or H2 to acetyl-CoA
Implementation Method 2
a heterologous enzyme that converts phenylpyruvate to phenylacetaldehyde... the heterologous enzyme that converts phenylpyruvate to phenylacetaldehyde is decarboxylase
Implementation Method 3
a heterologous enzyme that converts phenylacetaldehyde to 2-phenylethanol... the heterologous enzyme that converts phenylacetaldehyde to 2-phenylethanol is phenylacetaldehyde reductase
Implementation Method 4
Gas fermentation technology can utilize a wide range of feedstocks... to produce ethanol, jet fuel, and a variety of other products
Data Source
AI summary
Disclosed herein are improved methods for production of 2-phenylethanol by microbial fermentation of substrates comprising carbon monoxide and/or carbon dioxide and further disclosed are genetically modified microorganisms for use in such methods that alleviate dependence on natural and petrochemical processes.