Recombinant Bacteria Ethylene Conversion to Ethanol
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Solution Overview
Problem
Current methods for converting methane to higher olefins and chemicals are energy-intensive, costly, and lack product specificity, making them uneconomical due to the high activation energy required to convert methane into large molecules, and existing biological methods using methanotrophs are difficult to scale up due to culturing challenges and limited genetic modification tools.
Innovation Solution
Engineering recombinant bacteria with elevated ethylene assimilation pathways to convert ethylene, derived from methane, into ethanol and n-butanol, utilizing enzymes such as ethylene hydratase, alkene monooxygenase, and ethylene oxide reductase to enhance production efficiency and specificity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional methods (MTO or FT synthesis) are used to convert methane to higher olefins, then chemical feedstocks can be produced, but the process becomes energy-intensive and costly due to high temperatures required for syngas generation
Solution Approach 1:
The patent replaces the conventional thermal/chemical syngas generation process with a biological system using engineered bacteria. Instead of using high-temperature thermal processes to convert methane to syngas and then to chemicals, the invention uses genetically modified bacteria that can directly assimilate methane or ethylene and convert them to chemical feedstocks through biological metabolic pathways, thereby substituting a mechanical/thermal system with a biological system that operates under milder conditions
Solution Approach 2:
The patent fundamentally changes the operating parameters from high-temperature industrial processes (>600°C for syngas generation) to physiological conditions suitable for bacterial growth and metabolism. By engineering bacteria with novel metabolic pathways, the conversion process occurs at ambient temperatures and pressures, dramatically reducing energy consumption while maintaining product production
2Quantity of substance
If high temperatures and pressures are applied to activate methane, then methane conversion is achieved, but product specificity is lost requiring additional purification steps
Solution Approach 1:
The patent replaces non-specific thermal activation processes with highly specific biological enzymatic systems. Engineered bacteria with tailored metabolic pathways selectively convert methane or ethylene to desired products through controlled biological reactions, providing inherent product specificity that eliminates or reduces the need for complex purification steps
Solution Approach 2:
The patent introduces engineered bacteria as an intermediary system between methane/ethylene and the final chemical feedstocks. These bacteria act as biological catalysts with specific metabolic pathways that guide the conversion process through defined intermediate steps, ensuring high selectivity and product specificity that cannot be achieved through direct thermal processing
3Force
If inorganic catalysts such as palladium are used to reduce activation energy, then methane activation is improved, but the process remains extremely energy intense and lacks product specificity
Solution Approach 1:
The patent replaces inorganic catalyst systems (such as palladium-based catalysts requiring high temperatures) with biological catalyst systems (enzymes within engineered bacteria). These biological catalysts operate under physiological conditions, reducing activation energy through enzymatic mechanisms that function at ambient temperatures, thereby dramatically reducing overall process energy intensity
Solution Approach 2:
The patent changes the operational parameters from extreme conditions (high temperature and pressure required for inorganic catalysis) to mild physiological conditions suitable for biological systems. The engineered bacteria perform catalysis through metabolic pathways that operate at ambient temperatures and pressures, fundamentally changing the energy profile of the process
4Quantity of substance
If methanotrophs are used for ethylene assimilation, then biological conversion is achieved, but large-scale applications are limited due to culturing difficulties and limited genetic modification tools
Solution Approach 1:
The patent uses engineered bacteria (such as E. coli or other model organisms) as an intermediary system that bridges the gap between natural methanotroph capabilities and industrial scalability requirements. These model organisms have well-established genetic tools and culturing protocols, allowing for easy genetic engineering and large-scale fermentation production while maintaining the desired ethylene assimilation function
Solution Approach 2:
The patent employs model bacterial organisms that serve multiple functions: they can be easily cultured at large scale, amenable to genetic modification, capable of ethylene assimilation through engineered pathways, and suitable for industrial fermentation processes. This multi-functionality addresses the scalability limitations of specialized methanotrophs
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
The recombinant bacteria achieve higher production rates of ethanol and n-butanol compared to native bacteria, providing a cost-effective and scalable route for producing chemical feedstocks and fuels, leveraging established genetic tools and industrial applications of recombinant bacteria.
Implementation Method 1
utilizing enzymes such as ethylene hydratase, alkene monooxygenase, and ethylene oxide reductase to enhance production efficiency and specificity
Implementation Method 2
utilizing enzymes such as ethylene hydratase, alkene monooxygenase, and ethylene oxide reductase to enhance production efficiency and specificity
Implementation Method 3
utilizing enzymes such as ethylene hydratase, alkene monooxygenase, and ethylene oxide reductase to enhance production efficiency and specificity
Data Source
AI summary
The present disclosure provides recombinant bacteria with elevated production of ethanol and/or n-butanol from ethylene. Methods for the production of the recombinant bacteria, as well as for use thereof for production of ethanol and/or n-butanol are also provided.