Fructose-4-Epimerase Variant for Stable Fructose-to-Tagatose Conversion
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Solution Overview
Problem
Existing methods for producing tagatose face challenges due to unstable raw material supply and high production costs, necessitating a more efficient and stable process using generalized sugars like fructose.
Innovation Solution
A fructose-4-epimerase variant with specific amino acid substitutions at positions 97, 124, 367, and 390 is developed, along with a method to convert fructose into tagatose using this variant, a polynucleotide encoding it, and a vector for expression in microorganisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If galactose is used as a raw material for tagatose production, then tagatose can be produced through isomerase reaction, but the production cost increases and raw material supply becomes unstable
Solution Approach 1:
The patent changes the chemical parameters of the substrate by developing a fructose-4-epimerase enzyme that can efficiently convert fructose (a generalized sugar) into tagatose, replacing the conventional galactose-based isomerase reaction pathway. This parameter change in substrate type resolves the contradiction by enabling stable, low-cost production from abundant fructose sources.
2Productivity
If conventional fructose-4-epimerase is used for tagatose production, then the process is simple, but the conversion activity and enzyme stability are insufficient
Solution Approach 1:
The patent applies local quality modification by introducing specific amino acid substitutions at key positions (97, 124, 367, and 390) of the fructose-4-epimerase protein structure. These localized changes at specific sites enhance both the conversion activity and thermal stability of the enzyme without altering the overall catalytic mechanism, thereby resolving the contradiction between productivity and reliability.
3Productivity
If amino acid substitutions are introduced at positions 97, 124, 367, and 390 of fructose-4-epimerase, then conversion activity and stability improve, but the protein structure becomes more complex
Solution Approach 1:
The patent employs parameter changes by systematically modifying amino acid residues at four specific positions (97, 124, 367, and 390) to optimize enzyme performance. These targeted substitutions enhance tagatose production capacity while maintaining a relatively simple protein structure, as the modifications are confined to specific sites rather than requiring comprehensive structural redesign.
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 variant exhibits improved conversion activity and stability, enabling efficient production of tagatose from fructose, enhancing economic efficiency and stability.
Implementation Method 1
a fructose-4-epimerase variant with specific amino acid substitutions at positions 97, 124, 367, and 390 is developed, along with a method to convert fructose into tagatose using this variant
Data Source
AI summary
The present application relates to a fructose-4-epimerase variant exhibiting tagatose conversion activity and a method for preparing tagatose using the same.