Mutant Mannose-6-Phosphate Isomerase for L-Ribose Production
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Solution Overview
Problem
Current methods for producing L-ribose face challenges such as high temperature and pressure requirements, complex purification processes, environmental pollution from chemical wastes, and low productivity compared to chemical synthesis, with existing biological methods having slow conversion rates due to wide substrate specificity and thermostability limitations of enzymes like mannose-6-phosphate isomerase from Mesophilic bacteria.
Innovation Solution
Development of a high-yield method using recombinant expression vectors encoding mannose-6-phosphate isomerase derived from thermophilic bacteria like Thermus thermophilus or Geobacillus thermodenitrificans, with specific mutant enzymes exhibiting improved thermostability and substrate solubility, enabling efficient conversion of L-ribulose to L-ribose.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If chemical synthesis is used to produce L-ribose, then productivity is high, but environmental pollution occurs due to chemical wastes
Solution Approach 1:
The patent replaces chemical synthesis methods with a biological enzymatic system. Mannose-6-phosphate isomerase catalyzes the conversion of mannose-6-phosphate to L-ribose-5-phosphate, which is then converted to L-ribose. This biological substitution eliminates the need for harsh chemicals, high temperatures, and high pressures, thereby preventing environmental pollution while maintaining high productivity.
2Productivity
If existing biological methods using mannose-6-phosphate isomerase from Mesophilic bacteria are used, then L-ribose production is achieved, but thermostability is low and substrate solubility is limited
Solution Approach 1:
The patent employs site-directed mutagenesis to modify specific amino acid residues in the mannose-6-phosphate isomerase sequence. Mutations at positions 90, 129, and 142 (among others) were introduced to enhance thermostability. These parameter changes at the molecular level allow the enzyme to maintain stability at higher temperatures while preserving its catalytic activity for L-ribose production.
3Adaptability or versatility
If enzymes with wide substrate specificity are used, then substrate availability is improved, but conversion rate becomes slow
Solution Approach 1:
The patent optimizes the enzyme's active site through specific amino acid mutations to create a more specialized binding pocket that maintains high affinity for L-ribulose while improving catalytic turnover. Mutations such as K124R and L129F locally modify the enzyme-substrate interaction to enhance conversion rate without sacrificing substrate availability.
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 method achieves high productivity and thermostability, overcoming the limitations of existing biological methods by providing a high-yield, eco-friendly process for producing L-ribose with enhanced enzyme activity and stability, outperforming previous biological methods in terms of conversion rates and enzyme performance.
Implementation Method 1
mannose-6-phosphate isomerase, mutant enzyme thereof, and a method of producing L-ribose using the enzyme
Data Source
AI summary
New mannose-6-phasphate isomerase, mutant enzyme thereof, and a method of producing L-ribose using the enzyme are provided, and more specifically, mannose-6-phosphate isomerase, mutant enzyme thereof, recombinant expression vectors including relevant genes, microorganisms transformed with the vectors, a method of producing mannose-6-phosphate isomerase or mutant thereof in bulk using them, and a high yield method of producing L-ribose using the mannose-6-isomerase or the mutant thereof, are provided.