Modified NCgl2522 Polypeptide for Ornithine Export Efficiency
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Solution Overview
Problem
Current methods for producing putrescine and arginine, important industrial chemicals, rely on non-renewable petrochemicals and involve high temperature and pressure processes, while existing proteins for exporting these compounds have limited yield and efficiency.
Innovation Solution
A novel polypeptide with enhanced ability to export ornithine-based products, specifically putrescine and arginine, is introduced by modifying the NCgl2522 protein, where the glycine residue at position 77 is substituted with other amino acids, improving export efficiency when expressed in putrescine- or arginine-producing strains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional chemical production methods are used for putrescine and arginine, then production capacity is achieved, but reliance on non-renewable petrochemicals and high temperature/pressure processes increases
Solution Approach 1:
The patent changes the production parameters from conventional chemical methods (high temperature, pressure, petrochemical raw materials) to biological fermentation conditions (ambient temperature and pressure, renewable carbon sources), enabling sustainable production of putrescine and arginine
Solution Approach 2:
The patent replaces mechanical/chemical production systems with biological systems using microorganisms that convert renewable carbon sources into target products through metabolic pathways, eliminating the need for expensive catalyst systems and extreme process conditions
2Productivity
If existing export proteins are used to export putrescine and arginine, then some export function is achieved, but yield and efficiency are limited
Solution Approach 1:
The patent modifies the amino acid sequence of the export protein by changing parameters such as charge distribution, hydrophobicity, and structural conformation to enhance its transport activity and efficiency
Solution Approach 2:
The patent introduces specific amino acid residues at particular positions in the protein sequence to create localized functional regions that enhance substrate binding and transport efficiency, while maintaining overall protein structure
Data Source
AI summary
The present disclosure relates to a novel polypeptide having an ability to export an ornithine-based product, and a method for producing an ornithine-based product using the same.