Engineered Microorganisms for Butadiene Biosynthesis
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Solution Overview
Problem
Current methods for producing butadiene rely on fossil-based sources and involve energy-intensive dehydration steps, leading to environmental waste and high costs, while direct fermentative production from renewable feedstocks is not yet feasible.
Innovation Solution
Development of non-naturally occurring microbial organisms engineered with exogenous nucleic acids encoding butadiene or crotyl alcohol pathway enzymes to produce butadiene or crotyl alcohol through biosynthetic pathways, utilizing renewable feedstocks and eliminating the need for dehydration steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If butadiene is produced through traditional steam cracking of petroleum feedstocks, then butadiene can be manufactured at current scale, but the process consumes large amounts of energy and generates harmful waste emissions
Solution Approach 1:
The patent replaces the thermal cracking process (mechanical/thermal system) with a biological fermentation system. Microorganisms are engineered to directly produce butadiene or crotyl alcohol precursors through metabolic pathways, eliminating the need for high-temperature steam cracking and subsequent dehydration steps, thereby significantly reducing energy consumption while maintaining production capability
Solution Approach 2:
The invention changes the fundamental production parameters from petrochemical processing (high temperature, catalyst-based dehydration) to biological fermentation (mild conditions, enzyme-catalyzed pathways). By modifying the metabolic parameters of microorganisms through genetic engineering, butadiene can be produced directly from renewable feedstocks without energy-intensive processing steps
2Ease of manufacture
If butadiene is produced through fermentation followed by dehydration, then butadiene can be produced from renewable feedstocks, but additional processing steps are required that increase complexity and cost
Solution Approach 1:
The patent merges the production of butadiene precursors and the dehydration function into a single biological system. By engineering microorganisms to express both the metabolic pathways for precursor synthesis and the enzymatic dehydration capability, the process combines multiple steps into one integrated fermentation process, reducing overall process complexity
Solution Approach 2:
The engineered microorganisms perform self-service by autonomously carrying out the dehydration reaction within the cell. The expressed enzymes (such as crotonase or other dehydratases) automatically convert diol precursors to butadiene under fermentation conditions, eliminating the need for separate external dehydration processing steps
3Loss of substance
If butadiene is produced through fermentation followed by separation and purification, then butadiene can be obtained in high purity, but the additional processing steps increase cost and energy consumption
Solution Approach 1:
The patent utilizes the phase transition property of butadiene (boiling point -4.4°C) to simplify separation. Since butadiene is a gas at fermentation temperature while other fermentation components remain in liquid or solid phase, butadiene can be continuously removed from the fermenter by pressure reduction or inert gas sparging, achieving separation without energy-intensive distillation and minimizing material loss
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 sustainable production of butadiene from renewable sources, reducing energy consumption, waste, and environmental impact, while improving cost efficiency and scalability.
Implementation Method 1
One possible way to produce butadiene renewably involves fermentation of sugars or other feedstocks to produce diols
Implementation Method 2
non-naturally occurring microbial organisms containing butadiene or crotyl alcohol pathways comprising at least one exogenous nucleic acid encoding a butadiene or crotyl alcohol pathway enzyme
Data Source
AI summary
The invention provides non-naturally occurring microbial organisms having a butadiene or crotyl alcohol pathway. The invention additionally provides methods of using such organisms to produce butadiene or crotyl alcohol.