Recombinant E. coli for Enhanced Alanine Fermentation Yield
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Solution Overview
Problem
The demand for efficient production of alanine in the chemical industry is increasing, but existing methods for fermentative production in E. coli require improvements in yield and productivity.
Innovation Solution
A recombinant microorganism of the Escherichia coli family with specific modifications, including reduced or repressed activity of the brnQ gene and increased or enhanced activity of the argP, gcvA, and lpxD genes, is developed to enhance alanine production, which can also be adapted for producing other metabolites like pyruvate, succinate, aspartate, malate, lactate, valine, and leucine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional E. coli strains are used for alanine production, then the production process is simple and well-established, but the yield and productivity are insufficient to meet increasing industrial demand
Solution Approach 1:
The patent applies parameter changes by modifying specific gene expressions (brnQ, argP, gcvA, gcvB, lpxD) in the E. coli microorganism to optimize alanine production. By adjusting the activity levels of these genes, the microorganism achieves higher productivity while maintaining a relatively simple genetic modification approach that can be implemented in existing industrial fermentation processes.
2Productivity
If multiple genes are modified to improve alanine production, then productivity increases, but the complexity of genetic modification increases
Solution Approach 1:
The patent segments the genetic modification into specific, identifiable gene regions (brnQ, argP, gcvA, gcvB, lpxD), allowing for targeted modifications rather than comprehensive genome editing. This segmentation enables systematic optimization of each gene's contribution to alanine production while maintaining manageability in the overall genetic engineering process.
Solution Approach 2:
The modified E. coli strain serves multiple functions: it produces alanine at enhanced rates, maintains metabolic flexibility, and can be adapted for producing other metabolites. The gene modifications create a universal strain that can fulfill various industrial requirements without requiring separate specialized strains for different products.
3Adaptability or versatility
If E. coli is used for alanine production, then the process is efficient and widely accepted, but there is limited adaptability for producing other metabolites
Solution Approach 1:
The patent creates a universal E. coli strain through comprehensive gene modifications that enable the microorganism to produce not only alanine but also other metabolites such as pyruvate, succinate, aspartate, malate, lactate, valine, and leucine. The modified genes work synergistically to provide metabolic flexibility while maintaining the reliability of E. coli as an industrial workhorse.
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 modified microorganism achieves higher yields and productivity of alanine and related metabolites, improving industrial production efficiency and adaptability for various amino acid derivatives.
Implementation Method 1
a method for producing pyruvate, succinate, aspartate, malate, lactate, valine, leucine and/or alanine and to the use of the recombinant nucleic acid molecule or the recombinant microorganism for the fermentative production of pyruvate, succinate, aspartate, malate, lactate, valine, leucine and/or alanine
Data Source
AI summary
The present invention relates to a recombinant nucleic acid molecule, a recombinant microorganism, to a method for producing alanine and to the use of the recombinant nucleic acid molecule or the recombinant microorganism for the fermentative production of alanine.