Reverse Beta Oxidation Pathway for Higher-Chain Fuel Synthesis
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Solution Overview
Problem
Current biological methods for producing higher-chain alcohols, fatty acid methyl esters, and hydrocarbons are inefficient and costly, and existing pathways require carbon-chain elongation, making them incompatible with existing fuel infrastructure and storage systems.
Innovation Solution
A functional reversal of the beta-oxidation cycle in microorganisms like Escherichia coli, using coenzyme-A thioester intermediates and acetyl-CoA for direct acyl-chain elongation, combined with endogenous dehydrogenases and thioesterases to synthesize alcohols, carboxylic acids, and alkenes, allowing for efficient production of higher-chain fuels and chemicals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If traditional carbon-chain elongation pathways are used to produce higher-chain fuels, then longer chain molecules can be synthesized, but the process becomes less efficient and more costly
Solution Approach 1:
The patent applies reverse beta-oxidation, which inverts the natural beta-oxidation pathway. Instead of breaking down fatty acids as nature does, the engineered pathway uses the same enzymes in reverse to build longer carbon chains from acetyl-CoA and propionyl-CoA, achieving efficient higher-chain fuel production
2Quantity of substance
If ethanol is produced as a renewable fuel, then biofuel production can be achieved, but the fuel suffers from high hygroscopicity, high vapor pressure and low energy density making it incompatible with current fuel infrastructure
Solution Approach 1:
The patent changes the chemical parameters of the produced fuel by generating higher-chain alcohols (C≥4) instead of ethanol. These longer-chain molecules have reduced hygroscopicity, reduced volatility, and higher energy density, making them compatible with existing fuel storage, distribution and usage infrastructure
3Length of moving object
If non-native genes are introduced to drive synthesis of longer chain molecules, then carbon chain elongation can be achieved, but the complexity of the system increases and efficiency decreases
Solution Approach 1:
The patent employs endogenous enzymes that already exist in the organism to perform the synthesis function. By repurposing native beta-oxidation enzymes to operate in reverse, the system avoids the complexity of introducing and maintaining non-native genes while achieving efficient longer chain molecule 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 production of higher-chain linear alcohols and fatty acids with improved efficiency and compatibility with existing fuel infrastructure, demonstrating superior carbon and energy efficiency compared to traditional methods.
Implementation Method 1
a functional reversal of the beta-oxidation cycle in microorganisms like Escherichia coli, using coenzyme-A thioester intermediates and acetyl-CoA for direct acyl-chain elongation
Implementation Method 2
combined with endogenous dehydrogenases and thioesterases to synthesize alcohols, carboxylic acids, and alkenes
Implementation Method 3
alcohol-forming coenzyme-A thioester reductases (which make alcohols)
Data Source
AI summary
The invention relates to recombinant microorganisms that have been engineered to produce various chemicals using genes that have been repurposed to create a reverse beta oxidation pathway. Generally speaking, the beta oxidation cycle is expressed and driven in reverse by modifying various regulation points for as many cycles as needed, and then the CoA thioester intermediates are converted to useful products by the action of termination enzymes.