Engineered Microorganisms for Fatty Acid Production
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Solution Overview
Problem
Current methods for producing fatty acids from bacteria are not cost-effective due to slow cycle times, excessive glycerol accumulation, and inefficient biosynthesis, limiting the commercial viability of biodiesel production from plant oils.
Innovation Solution
Engineered microorganisms, such as E. coli, are developed to produce tailored fatty acids by introducing specific genetic changes, including thioesterase reduction or inactivation of TCA cycle or glycolysis enzymes, combined with overexpression of acetyl-CoA carboxylase and coenzyme A-acyl carrier protein transacylase, to enhance fatty acid synthesis and secretion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If plant oils are used to derive biodiesel, then fatty acid production is achieved, but slow cycle times and excessive glycerol accumulation occur
Solution Approach 1:
The patent replaces the mechanical extraction process from plant oils with a biological production system using engineered bacteria. The bacteria synthesize fatty acids through metabolic pathways, substituting the need for mechanical oil extraction and transesterification processes, thereby eliminating slow cycle times associated with plant oil processing.
Solution Approach 2:
The patent modifies metabolic parameters by knocking out specific genes (fadD, sucC, fumC) to alter the bacterial metabolism. This changes the parameter of fatty acid synthesis efficiency, enabling continuous production without the cycle time constraints of plant oil processing. The genetic modifications adjust the metabolic flux to favor fatty acid accumulation over glycerol production.
2Productivity
If bacteria are used to produce fatty acids, then production speed is increased, but biosynthesis is tightly regulated limiting large quantity production
Solution Approach 1:
The patent extracts or removes the regulatory constraints from the bacterial biosynthesis system by knocking out specific genes (fadD, sucC, fumC) that normally limit fatty acid production. This takes out the regulatory mechanisms that prevent large-scale production, allowing the bacteria to produce fatty acids at high speeds and in large quantities simultaneously.
Solution Approach 2:
The patent creates a dynamic production system where the bacteria can adjust their metabolism to favor fatty acid synthesis. By removing regulatory constraints, the system becomes dynamically flexible, allowing high production speeds to be maintained while accumulating large quantities of fatty acids without the tight regulation that normally limits production.
3Quantity of substance
If conventional bacterial fatty acid extraction is used, then fatty acids are obtained, but cell lysis is required reducing cost-effectiveness
Solution Approach 1:
The patent enables the bacteria to self-release fatty acids into the culture medium through the expression of thioesterase enzymes. This self-service mechanism eliminates the need for external cell lysis processes, allowing fatty acids to be naturally secreted and collected from the medium, thereby reducing manufacturing costs and improving ease of production.
Solution Approach 2:
The patent introduces thioesterase enzymes as intermediary agents that facilitate the release of fatty acids from the bacteria. These enzymes act as mediators between the bacterial interior and exterior, enabling fatty acids to be transferred to the culture medium without requiring cell lysis, thus simplifying the extraction process and improving cost-effectiveness.
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 engineered microorganisms achieve a significant increase in fatty acid production, allowing for efficient collection and extraction, thereby improving the cost-effectiveness and scalability of fatty acid production.
Implementation Method 1
addition of, for example, a plant acyl-ACP thioesterase
Data Source
AI summary
There is provided a recombinant bacterium comprising at least one overexpressed acyl-ACP thioesterase gene, and wherein at least one gene from the tricarboxylic acid cycle or glycolysis or both is inactivated. There is also provided a method for producing fatty acids, said method comprising culturing bacteria comprising at least one overexpressed acyl-ACP thioesterase gene in a growth medium in a container having walls; allowing said bacteria to secrete fatty acids; and collecting said fatty acids. Acid supplementation is also shown to increase productivity.