Recombinant Microbial Cells for Ester Biosynthesis
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Solution Overview
Problem
Current fermentation approaches for producing alcohols and organic acids face challenges such as toxicity to cells, high purification costs due to energy-intensive distillation, and environmental impact from salt disposal, limiting their commercial viability as biofuels.
Innovation Solution
Development of a recombinant microbial cell platform that biosynthesizes esters from acyl-CoA and alcohols, offering a more efficient and cost-effective method for producing biofuels by utilizing engineered pathways for ester production, which are less toxic and easier to recover than alcohols and organic acids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fermentation approaches are used to produce alcohols and organic acids, then biofuel production is achieved, but cell toxicity increases and purification costs rise due to energy-intensive distillation
Solution Approach 1:
The patent changes the chemical parameters of the fermentation process by directing metabolism toward ester production instead of traditional alcohol/organic acid fermentation. This involves modifying cellular pathways to accumulate esters like isobutyrate and isoamyl acetate, which have different toxicological properties and physical characteristics that enable simpler recovery processes
Solution Approach 2:
The patent converts the harmful effect of fermentation byproducts into a beneficial outcome by producing esters that are less toxic to cells and easier to recover. The esters accumulate to high concentrations without the same toxic effects that limit traditional biofuel production, and their recovery avoids energy-intensive distillation
2Productivity
If fermentation approaches are used to produce alcohols and organic acids, then biofuel production is achieved, but purification costs increase due to energy-intensive distillation
Solution Approach 1:
The patent changes the physical-chemical parameters of the product by producing esters instead of alcohols/organic acids. Esters have different solubility and volatility characteristics that enable simpler separation processes, avoiding the need for energy-intensive distillation while maintaining high productivity
Solution Approach 2:
The patent replaces the mechanical/thermal separation system (distillation) with a simpler recovery process for esters. The esters can be recovered through less energy-intensive methods due to their different physical properties, substituting the traditional distillation infrastructure with simpler separation techniques
3Productivity
If traditional biofuel candidates like ethanol and butanol are produced, then fuel production is achieved, but recovery processes become complex and costly
Solution Approach 1:
The patent changes the chemical identity of the fuel product from traditional alcohols to esters, which have different recovery characteristics. The ester molecules accumulate to comparable or exceeding concentrations of traditional biofuels but can be recovered through simpler processes due to their unique solubility and phase behavior properties
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 ester platform enables higher theoretical yields and simpler recovery processes, reducing costs and environmental impact, with esters like isobutyrate and isoamyl acetate accumulating to concentrations comparable to or exceeding those of traditional biofuel candidates like ethanol and butanol.
Implementation Method 1
The recombinant cell can exhibit an increase in conversion of an organic acid to an acyl-CoA compared to a wild-type control, an increase in conversion of ketoacids to an acyl-CoA compared to a wild-type control, an increase in conversion of an aldehyde to an organic acid compared to a wild-type control, an increase in conversion of an aldehyde to an alcohol compared to a wild-type control, or an increase in combining an acyl-CoA with an alcohol to form an ester compared to a wild-type control
Data Source
AI summary
This disclosure describes engineered biosynthetic pathways, recombinant cells, and methods relating to biosynthesis of esters. The recombinant cells may be modified to exhibit increased biosynthesis of an ester compared to a wild-type control. The recombinant cell may be incubated in medium that includes a carbon source under conditions effective for the recombinant cell to produce an ester. This disclosure also describes a method that generally includes introducing into a host cell a heterologous polynucleotide encoding at least one polypeptide that catalyzes a step in converting a carbon source to an ester, wherein the at least one polynucleotide is operably linked to a promoter so that the modified host cell catalyzes conversion of the carbon source to an ester.