Mutant Thioesterase Enzymes for Tailored Fatty Acid Derivatives
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Solution Overview
Problem
Current methods for producing biodiesel and industrial chemicals from vegetable oil feedstocks are inefficient, geographically restricted, and require extensive energy and resources, with existing technologies failing to produce tailored fatty acid derivatives with specific properties for optimal applications.
Innovation Solution
Development of mutant and naturally-occurring thioesterase enzymes that convert C10, C12, or C14 acyl-ACP substrates into fatty acid derivatives with enhanced activity, allowing for microbial fermentation to produce tailored fatty esters and industrial chemicals without the need for ester synthase, enabling tailored product profiles for specific applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transesterification of triacylglycerides from vegetable oil feedstocks is used to produce biodiesel, then fatty esters can be produced as biodiesel, but the process requires extensive energy and resources, produces undesirable byproducts requiring purification, and is geographically and seasonally restricted
Solution Approach 1:
The patent replaces the chemical transesterification process with a biological pathway using recombinant microorganisms and thioesterase enzymes to synthesize fatty acid derivatives directly from acetyl-CoA, eliminating the need for energy-intensive purification steps and byproduct removal
Solution Approach 2:
The patent extracts and utilizes only the essential fatty acid synthesis pathway components (thioesterase enzymes, acetyl-CoA) while discarding the unnecessary transesterification step, glycerin byproduct, and purification processes from the conventional biodiesel production method
2Productivity
If vegetable oil feedstocks are used for biodiesel production, then fatty esters can be produced, but the yield is limited (e.g., 1300 L/hectare for rapeseed) and requires extensive acreage for cultivation
Solution Approach 1:
The patent substitutes agricultural cultivation with microbial fermentation technology, allowing fatty acid derivative production from non-food biomass sources without requiring extensive land use for crop cultivation
Solution Approach 2:
The patent changes the feedstock parameter from vegetable oils (limited yield, high land use) to alternative biomass sources (higher yield potential, lower land use), thereby increasing productivity per unit area
3Productivity
If conventional thioesterase enzymes are used in recombinant cells, then fatty acid derivatives can be produced, but the enzymes lack substrate specificity and produce mixtures of products with undefined properties
Solution Approach 1:
The patent applies local quality by creating thioesterase enzyme variants with specific catalytic properties tailored to produce particular fatty acid derivatives (e.g., C10, C12, C14 chains) with defined carbon lengths and saturation levels, rather than producing a mixture of products
Solution Approach 2:
The patent changes the enzymatic parameters (substrate specificity, product distribution) through enzyme engineering to control the carbon chain length, branching, and saturation of fatty acid derivatives, enabling precise control over product specifications
4Productivity
If ester synthase is required for fatty acid ester production in recombinant cells, then fatty acid esters can be synthesized, but the process complexity increases and additional enzymes are needed
Solution Approach 1:
The patent removes the ester synthase enzyme from the required enzyme set, demonstrating that thioesterase enzymes alone can catalyze the formation of fatty acid esters from acetyl-CoA and alcohol substrates, thereby simplifying the overall enzymatic system
Solution Approach 2:
The patent shows that thioesterase enzymes perform multiple functions including both thioester bond formation and ester synthesis, eliminating the need for separate dedicated ester synthase enzymes and reducing system complexity
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 novel thioesterase enzymes improve the efficiency and cost-effectiveness of fatty acid derivative production, enabling the creation of biodiesel and industrial chemicals with tailored properties, such as improved fuel characteristics and reduced energy consumption, while reducing geographical and seasonal limitations.
Implementation Method 1
catalytic properties of the thioesterase enzyme(s) towards the hydrolysis of acyl-CoA and/or acyl-acyl carrier protein (acyl-ACP) substrates
Implementation Method 2
microbial fermentation to produce tailored fatty esters and industrial chemicals
Data Source
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AI summary
The present invention relates to novel mutant thioesterase enzymes and naturally-occurring equivalents thereof, compositions made from such enzymes and uses of thioesterase enzymes. In particular, the present invention provides mutant thioesterase enzymes that have altered properties, for example, altered substrate specificity, altered activity, altered selectivity, and/or altered proportional yields in the product mixtures. The present invention also provides polynucleotides encoding such mutant thioesterase enzymes, and vectors and host cells comprising such polynucleotides. The invention further provides for novel uses of thioesterases in the production of various fatty acid derivatives, which are useful as, or as components of, industrial chemicals and fuels.