ImpE Protein Variants Enhance IMP Export Yield
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Solution Overview
Problem
Current methods for producing 5'-inosine monophosphate (IMP) through microbial fermentation face challenges in achieving high yields due to inefficient export of IMP by microorganisms, which is attributed to the limitations of existing enzymes in terms of activity, stability, and substrate specificity.
Innovation Solution
Development of a protein variant, specifically ImpE1 and ImpE2, derived from Corynebacterium species, which enhances the export of IMP by modifying key amino acids, thereby improving the microorganism's ability to produce IMP at higher concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional enzymes are used for IMP production, then the production process is established, but the export activity and yield of IMP are insufficient
Solution Approach 1:
The patent applies parameter changes by modifying the amino acid sequence of the ImpE protein to create variants with improved properties. Specifically, the invention identifies and modifies key amino acid residues in the ImpE protein sequence to enhance IMP export activity, thereby increasing overall IMP yield while maintaining enzyme stability and function.
2Manufacturing precision
If enzyme modification is attempted through rational design, then specific improvements can be targeted, but insufficient structural information prevents effective application
Solution Approach 1:
The patent overcomes the lack of structural information by using a combination of bioinformatic analysis and systematic amino acid substitution approaches. The invention identifies conserved regions and key residues through sequence comparison and applies targeted mutations based on functional predictions, achieving precise enzyme modification without requiring detailed three-dimensional structural data.
3Productivity
If directed evolution is used to improve enzyme activity, then a library of modified enzymes can be screened, but the process is time-consuming and resource-intensive
Solution Approach 1:
The patent significantly reduces the time and resources required for enzyme improvement by replacing extensive directed evolution screening with a rational design approach based on amino acid sequence analysis. The invention identifies specific amino acid positions for modification and tests a focused set of mutations, achieving improved IMP export activity in fewer experimental cycles compared to traditional directed evolution methods.
Data Source
AI summary
The present disclosure relates to a novel polypeptide having an activity of exporting 5′-inosine monophosphate, a microorganism comprising the same, a method for preparing 5′-inosine monophosphate using the same, and a method for increasing export of 5′-inosine monophosphate.