Microorganism Gene Expression Control for Metabolite Accumulation
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Solution Overview
Problem
Current methods for producing useful compounds like organic acids or amino acids using microorganisms often require the addition of intermediate metabolites to the medium, increasing production costs and complicating the optimization of production conditions.
Innovation Solution
A method involving the deletion of specific genes in microorganisms like Corynebacterium glutamicum to reduce the activity of enzymes converting intermediate metabolites into final products, allowing for regulation of gene expression using different promoters and repressors to enhance the accumulation of target compounds without adding intermediate metabolites to the medium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If auxotrophic mutation or recombinant DNA technology is used to delete enzyme activity for converting intermediate metabolite into final product, then productivity of target compound is improved, but production cost increases due to necessary addition of intermediate metabolite or final product to medium
Solution Approach 1:
The invention changes the regulatory parameter of gene expression by replacing the native promoter with an inducible promoter (lac promoter). This allows control of enzyme X activity through inducer addition, enabling the cell to produce the target compound without requiring external supplementation of intermediate metabolites or final products, thus resolving the contradiction between productivity improvement and cost increase
2Productivity
If multiple types of auxotrophy are developed to prevent intermediate metabolite from entering branched pathways, then productivity of target compound is improved, but medium complexity increases due to addition of multiple compounds
Solution Approach 1:
The invention changes the regulatory mechanism from multiple auxotrophic mutations to a single inducible promoter system. By controlling the transcription of gene x through the lac promoter and repressor, the system achieves pathway control without developing multiple auxotrophies, thereby simplifying the medium composition while maintaining high productivity
3Productivity
If mutation is introduced to decrease enzyme activity for converting intermediate metabolite into final product, then amount of target compound produced is increased, but ease of operation decreases due to difficulty in determining optimal conditions
Solution Approach 1:
The invention introduces dynamic control of enzyme activity through an inducible promoter system. The enzyme activity can be adjusted in real-time by controlling the concentration of inducer, allowing easy optimization of production conditions without being constrained by fixed mutation effects. This makes the system highly operable and adaptable to different production requirements
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 efficient production of compounds like protocatechuic acid and 3-dehydroshikimic acid without adding aromatic amino acids, significantly increasing yields and reducing production costs by controlling gene expression and enzyme activity.
Implementation Method 1
transcription of the gene x encoding a protein of Enzyme X is regulated by a promoter and wherein the transcription is repressed with the aid of a repressor
Data Source
AI summary
It is an object of the present invention to provide a bacterial strain that can decrease the amount of an intermediate Compound P converted into Metabolite M and efficiently accumulate Compound P in a medium that is not supplemented with Metabolite M or the final product generated from Metabolite M. The present invention provides a prokaryotic organism having all features (a) to (d) as defined in the specification so as to accumulate Compound P by regulating expression level of Enzyme X that converts Compound P as an intermediate metabolite into Metabolite M in a biosynthetic pathway in which Metabolite M indispensable for the growth is produced from a carbon source.