Recombinant Bacterium Producing Anthranilic Acid Without Tryptophan
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Solution Overview
Problem
Current methods for producing anthranilic acid are unsustainable and costly due to the need for high temperature and pressure conditions and generate toxic by-products, and using tryptophan auxotroph strains increases production costs significantly.
Innovation Solution
A recombinant bacterium is genetically modified to imbalance anthranilate phosphoribosyltransferase and anthranilate synthase activities in favor of synthase activity, allowing it to grow in a tryptophan-free medium and accumulate anthranilic acid without requiring tryptophan supplementation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If tryptophan auxotroph strains are used to accumulate anthranilic acid, then anthranilic acid production is improved, but production costs increase dramatically due to the need for tryptophan supplementation
Solution Approach 1:
The invention changes the enzymatic activity parameters by separately expressing TrpG and TrpD polypeptides with optimized expression levels. This creates an imbalance in favor of anthranilate synthase activity, allowing anthranilic acid accumulation while maintaining bacterial growth capability without tryptophan supplementation, thus resolving the contradiction between productivity and manufacturing cost
Solution Approach 2:
The invention segments the bifunctional TrpGD protein into separate TrpG and TrpD polypeptides that are expressed independently. This segmentation allows separate optimization of each enzyme's expression level, enabling the desired imbalance in enzymatic activities while maintaining the ability to grow without tryptophan, thereby reducing production costs while maintaining productivity
2Device complexity
If chemical synthesis methods are used to produce anthranilic acid, then production process is simplified, but environmental harm increases due to toxic by-products and unsustainable conditions
Solution Approach 1:
The invention replaces the mechanical/chemical synthesis system with a biological system using recombinant bacteria. This substitution eliminates the need for high temperature and pressure conditions and avoids toxic by-products, while the genetic engineering approach keeps the production process relatively simple, thus resolving the contradiction between process simplicity and environmental harm
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
This approach enables the production of anthranilic acid in a sustainable and cost-effective manner by eliminating the need for tryptophan supplementation, reducing production costs and environmental impact.
Implementation Method 1
the recombinant bacterium has been genetically modified to induce an imbalance between anthranilate phosphoribosyltransferase activity and anthranilate synthase activity in favor of anthranilate synthase activity
Data Source
AI summary
The present invention relates to a recombinant bacterium genetically modified to produce anthranilic acid and being able to grow in a culture medium lacking tryptophan. It also relates to a method for producing anthranilic acid using said recombinant bacterium.