Photosynthetic Microorganisms with Exogenous Thioesterases for Fatty Acid Yield
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Solution Overview
Problem
Current methods for producing biofuels from phototrophic organisms, such as algae and cyanobacteria, are limited in efficiency and yield, particularly in generating free fatty acids and derivatives, which are crucial for lipid extraction and biodiesel production.
Innovation Solution
Engineered photosynthetic microorganisms expressing a recombinant prokaryotic acyl-ACP thioesterase gene, which enhances the production of free fatty acids and derivatives by up to 50 mg per liter, with specific chain lengths and derivatives like wax esters, fatty alcohols, and alkanes, through genetic modification and expression of specific thioesterase enzymes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional lipid extraction methods are used from phototrophic organisms, then biodiesel production can proceed, but the yield and efficiency of free fatty acid production is limited
Solution Approach 1:
The patent modifies the biochemical parameters of the phototrophic organism by introducing exogenous thioesterase genes (tesA, tesB, or tesC from E. coli) to alter the fatty acid metabolism pathway. This genetic modification changes the enzyme activity parameters, specifically enhancing acyl-ACP thioesterase activity to increase free fatty acid release from the fatty acid synthase complex, thereby improving production yield without fundamentally changing the manufacturing process
Solution Approach 2:
The patent introduces copies of bacterial thioesterase genes into the phototrophic organism's genome or plasmids. These exogenous gene copies encode enzymes that replicate the function of E. coli thioesterases, enabling the host organism to produce higher levels of free fatty acids. The copied genetic material is integrated into the host's biological system to achieve enhanced productivity
2Productivity
If genetic modification is applied to enhance free fatty acid production, then productivity increases by up to 50 mg per liter, but the device complexity increases due to recombinant nucleic acid introduction
Solution Approach 1:
The patent employs universal plasmid vectors (such as pUC19, pBR322, or pET series) that can accommodate multiple thioesterase genes and function across different phototrophic host strains. These plasmids contain universal elements including origin of replication, antibiotic resistance markers, and multiple cloning sites, allowing the same vector system to be used for introducing tesA, tesB, or tesC genes into various cyanobacterial or algal strains, thereby reducing the need for strain-specific genetic engineering approaches
Solution Approach 2:
The patent utilizes transient expression systems where plasmids are introduced into phototrophic cells without permanent integration into the genome. These plasmid-based expression systems can be easily removed or degraded after serving their purpose of enhancing free fatty acid production, avoiding the long-term complexity of stable genomic integration while achieving the desired productivity boost during the expression period
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
Significantly increases the yield of free fatty acids and derivatives in engineered microorganisms, optimizing chain lengths and types for biodiesel production, thereby improving biofuel efficiency and productivity.
Implementation Method 1
Engineered photosynthetic microorganisms expressing a recombinant prokaryotic acyl-ACP thioesterase gene, which enhances the production of free fatty acids and derivatives
Implementation Method 2
The acyl-ACP thioesterase enzyme catalyzes the hydrolysis of acyl-ACP thioester bonds to release free fatty acids
Implementation Method 3
Photosynthetic life forms capture light energy and subsequently convert it into the free energy of organic compounds based on fixed CO2, using water as the ultimate electron donor
Data Source
AI summary
The described invention provides genetically engineered photosynthetic microorganisms expressing prokaryotic acyl-ACP thioesterases and methods of using the genetically engineered photosynthetic microorganisms for producing free fatty acids and/or fatty acid derivatives.