Isoprene Synthase Engineering in Methanogens for CO2 Valorization
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Solution Overview
Problem
Current carbon capture and utilization strategies are inadequate in converting CO2 into value-added products like biofuels, particularly in wastewater management, where CO2 accumulation inhibits methane production in anaerobic digesters.
Innovation Solution
Engineering microbial strains, such as Methanosarcina acetivorans, with plasmids expressing isoprene synthase to co-produce methane and isoprene, utilizing CO2 from energy facilities and wastewater, thereby enhancing methane production and wastewater treatment efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If CO2 is removed from emissions to minimize emissions, then environmental impact is reduced, but value-added product production is insufficient
Solution Approach 1:
The patent converts harmful CO2 emissions into valuable isoprene and methane products by engineering methanogens to express isoprene synthase. The microorganisms utilize CO2 from emissions streams as a carbon source for isoprene production, transforming a waste product into a valuable biochemical feedstock while simultaneously reducing greenhouse gas emissions.
Solution Approach 2:
Methanogens serve as biological intermediaries that convert CO2 into isoprene and methane. These engineered microorganisms act as a bridge between CO2 emissions and value-added products, facilitating the transformation through metabolic pathways that incorporate CO2 into isoprene synthase-catalyzed reactions.
2Quantity of substance
If CO2 accumulates in anaerobic digesters, then carbon availability increases, but methane production is inhibited
Solution Approach 1:
The patent introduces dynamic metabolic flexibility into methanogens by engineering them to express isoprene synthase. This allows the microorganisms to dynamically switch carbon flux between methane production and isoprene synthesis based on CO2 availability, optimizing both carbon utilization and product formation in response to changing environmental conditions.
Solution Approach 2:
The patent changes the metabolic parameters of methanogens by introducing foreign isoprene synthase genes and optimizing expression levels. This parameter change enables the microorganisms to utilize CO2 for isoprene production while maintaining methane synthesis, effectively decoupling the inhibitory effect of CO2 accumulation from methane production.
3Productivity
If engineered methanogens are introduced to augment wild methanogens, then isoprene production increases, but system complexity increases
Solution Approach 1:
The patent creates universal engineered methanogens that perform multiple functions: they maintain their native methane production capability while simultaneously producing isoprene through the introduced isoprene synthase pathway. This multi-functionality allows a single microbial strain to address both methane energy production and isoprene biochemical feedstock generation without requiring separate biological systems.
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 engineered strains achieve significant isoprene production, reducing methane production by directing carbon towards isoprene, improving wastewater treatment efficiency and biofuel yield, with potential economic benefits in various industries.
Implementation Method 1
preparing a vector comprising a nucleic acid encoding isoprene synthase; introducing the vector into a host cell; and culturing the host cell including the vector
Implementation Method 2
Methanosarcinales methanogens are the most metabolically diverse methanogens and can grow efficiently on most methanogenic substrates and/or methane gas (CH4)
Data Source
AI summary
Plasmid vectors and use of plasmid vectors in methods for producing methane and isoprene using Archaea are disclosed. Particularly, plasmid vectors that express isoprene synthase (ispS) are prepared and inserted into methanogens, such as Methanosarcina acetivorans, to allow for co-production of methane and isoprene. In one embodiment, the methods of the present disclosure can be used for wastewater management.