Methanotrophs for 1,4-BDO Production from Methane
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Solution Overview
Problem
Current methods for producing 1,4-butanediol (1,4-BDO) rely on petrochemical precursors, and there is no natural microbial production pathway, making it challenging to develop efficient fermentation methods using cheap carbon sources like methane.
Innovation Solution
Genetically modified microorganisms, such as methanotrophs, are engineered to convert methane into 1,4-BDO by introducing specific heterologous genes like pyruvate dehydrogenase, citrate synthase, and aldehyde dehydrogenase, enabling the microorganisms to produce 1,4-BDO through modified metabolic pathways.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If petrochemical precursors are used to produce 1,4-BDO, then production reliability is ensured, but dependence on fossil fuels increases and production costs rise
Solution Approach 1:
The patent changes the fundamental parameter of carbon source from petrochemical precursors to biological C1 feedstocks (methane, methanol, formate). This parameter change enables the use of renewable resources while maintaining production reliability through engineered microbial pathways that can consistently convert these feedstocks into 1,4-BDO.
Solution Approach 2:
The patent replaces the chemical synthesis mechanism (petrochemical processing) with a biological mechanism (microbial fermentation). By substituting the mechanical/chemical system with a biological system, the process becomes more sustainable and less dependent on fossil fuels while maintaining production capability.
2Ease of manufacture
If natural microbial production pathways are sought, then production costs decrease, but no natural pathway exists for 1,4-BDO production
Solution Approach 1:
The patent segments the metabolic pathway into distinct functional modules, assigning specific enzymes to specific steps in the conversion of C1 feedstocks to 1,4-BDO. This segmentation allows for systematic engineering and optimization of each step, enabling the construction of a functional pathway where none naturally existed.
Solution Approach 2:
The patent merges multiple metabolic pathways and enzyme systems into a unified biological factory. By combining heterologous genes encoding different enzymes (e.g., pyruvate dehydrogenase, citrate synthase, aconitate hydratase, isocitrate dehydrogenase) within a single microorganism, the system achieves the complete conversion of C1 feedstocks to 1,4-BDO.
3Ease of manufacture
If C1 carbon feedstock is used, then production cost decreases and renewable resource utilization increases, but conversion to multicarbon products is challenging
Solution Approach 1:
The patent introduces intermediary metabolites and enzyme systems to facilitate the conversion of C1 feedstocks to multicarbon products. Intermediaries such as pyruvate, acetyl-CoA, citrate, and various intermediates in the TCA cycle serve as bridges, enabling the stepwise construction of 1,4-BDO from simple C1 molecules.
Solution Approach 2:
The patent performs preliminary actions by pre-engineering the microbial cell with all necessary enzymatic components and metabolic pathways before actual production begins. This includes introducing heterologous genes, optimizing promoter strengths, and ensuring proper metabolic flux distribution, thereby preparing the system for efficient C1 to 1,4-BDO conversion.
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 allows for the economical production of 1,4-BDO from methane, overcoming the limitations of petrochemical dependence and natural production absence, achieving high yields and potentially reducing production costs.
Implementation Method 1
The genetically modified microorganism can comprise one or more heterologous genes. The one or more heterologous genes can be one or more of pyruvate dehydrogenase (aceEF), citrate synthase (gltA), aconitate hydratase 1 (acnA), or isocitrate dehydrogenase (icdA)... capable of converting a C1 carbon source to a multicarbon product
Implementation Method 2
There has been great interest in generating fuels and chemicals by microbial fermentation in order to curb the use of fossil fuels
Data Source
AI summary
Genetically modified microorganisms that have the ability to convert carbon substrates into chemical products such as 1,4-BDO are disclosed. For example, genetically modified methanotrophs that are capable of generating 1,4-BDO at high titers from a methane source are disclosed. Methods of making these genetically modified microorganisms and methods of using them are also disclosed.