L-amino acid production via evgA gadE ydeO gene expression
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Solution Overview
Problem
Current methods for producing L-amino acids using microorganisms are not efficient, as they do not effectively utilize the expression of genes like evgA, gadE, or ydeO, which are involved in the EvgAS two-component system, limiting the production capacity of L-amino acids such as L-lysine, L-threonine, and L-tryptophan.
Innovation Solution
Modifying microorganisms of the Enterobacteriaceae family to increase the expression of evgA, gadE, or ydeO genes by methods such as increasing gene copy number or modifying expression regulatory sequences, allowing for enhanced production of L-amino acids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional methods using wild-type or auxotrophic strains are used, then the microorganism can produce L-amino acids, but the production efficiency is not sufficient
Solution Approach 1:
The patent changes the expression level parameter of specific genes (evgA, gadE, ydeO) to improve L-amino acid production. By increasing the expression of these genes through genetic modification, the productivity of L-amino acids is significantly enhanced while managing the complexity of genetic modifications through targeted approaches.
2Quantity of substance
If gene copy number is increased to enhance expression, then L-amino acid production increases, but the genetic modification process becomes more complex
Solution Approach 1:
The patent segments the genetic modification approach by targeting specific genes (evgA, gadE, ydeO) individually or in combination, rather than random modifications. This segmented approach allows systematic increase in L-amino acid yield while managing modification complexity through focused, targeted changes.
3Productivity
If expression regulatory sequences are modified to increase gene expression, then production capacity improves, but the precision of genetic control becomes more difficult
Solution Approach 1:
The patent modifies expression regulatory sequences to change the expression level parameter of target genes, thereby improving production capacity. The approach balances enhanced productivity with maintainable genetic control precision through targeted regulatory sequence modifications.
Data Source
AI summary
An L-amino acid is produced by culturing a microorganism of the family Enterobacteriaceae which has the ability to produce an L-amino acid and which has been modified so as to increase the expression of the evgA gene, the gadE gene, and/or the ydeO gene. These genes encode a transcription factor involved in the EvgAS two-component system regulon. The culture takes place in a medium, and the L-amino acid is collected from the medium or cells.