Methylbutanol Biofuel Production via Recombinant Microorganisms
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Solution Overview
Problem
Current oxygenate fuels like ethanol have lower energy density and absorb water, making them costly to transport and distribute, whereas methylbutanol has higher energy content and does not absorb water, allowing for efficient pipeline distribution but lacks effective biological production methods.
Innovation Solution
Development of recombinant microorganisms that encode specific polypeptides to catalyze metabolic pathways for producing methylbutanol and derivatives, utilizing enzymes from various sources like Pichia and Saccharomyces to convert carbon sources into 2-methylbutanol, enabling biological production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If ethanol is used as a biofuel, then it can be produced through fermentation, but it has lower energy density and absorbs water, increasing transportation costs
Solution Approach 1:
The patent changes the chemical composition parameters by engineering metabolic pathways to produce methylbutanol (C5H12O) instead of ethanol (C2H5OH). This molecular structure change results in higher energy density (approximately 36.8 MJ/L for methylbutanol vs. 21.1 MJ/L for ethanol) while maintaining biofuel properties. The recombinant microorganisms achieve this through modified enzymatic pathways that convert carbon sources into methylbutanol, resolving the contradiction between energy content and production feasibility.
2Ease of operation
If ethanol is transported separately by rail or trucks to blending terminals, then it can be distributed, but transportation costs increase
Solution Approach 1:
The patent changes the hygroscopicity parameter of the biofuel by producing methylbutanol instead of ethanol. Methylbutanol has lower water affinity and does not absorb water from the environment or pipelines, enabling it to be transported through existing petroleum infrastructure without special precautions. This parameter change allows direct pipeline blending with gasoline and diesel, eliminating the need for separate transportation to blending terminals and reducing distribution costs.
3Productivity
If methylbutanol is produced biologically, then it can be a renewable fuel, but effective biological production methods were lacking
Solution Approach 1:
The patent segments the complex metabolic pathway into discrete enzymatic steps, each catalyzed by a specific recombinant enzyme. The metabolic pathway is divided into: (1) glycolysis to pyruvate, (2) pyruvate to acetyl-CoA, (3) acetyl-CoA to acetoacetyl-CoA, (4) acetoacetyl-CoA to HMG-CoA, and (5) HMG-CoA to methylbutanol. This segmentation allows for targeted enzyme engineering and optimization of each step, achieving high productivity through systematic pathway construction in recombinant microorganisms.
Solution Approach 2:
The patent uses recombinant enzymes as intermediaries to facilitate the conversion of carbon sources to methylbutanol. Specific enzymes such as threonine synthase, homoserine dehydrogenase, and methylbutanol synthase act as biological mediators that catalyze each transformation step. These engineered enzymes serve as intermediaries between the carbon source and the final fuel product, enabling efficient biological production that was previously unachievable.
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 biological production of methylbutanol and derivatives using recombinant microorganisms addresses the distribution challenges of existing fuels by providing a high-energy content fuel that can be efficiently transported and blended with gasoline and diesel, reducing environmental contamination risks.
Implementation Method 1
Some oxygenate fuels produced by fermentation, like ethanol
Implementation Method 2
at least three polypeptides that catalyze a substrate to product conversion selected from the group consisting of: malate to pyruvate, pyruvate to oxaloacetic acid, oxaloacetic acid to L-aspartate
Data Source
AI summary
This invention describes genes, metabolic pathways, microbial strains and methods to produce methylbutanol and other compounds of interest from renewable feedstocks.