Fructose-4-Epimerase Variant for Stable Tagatose Production
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Solution Overview
Problem
The stable supply of lactose, a key raw material for tagatose production, is economically unstable due to fluctuations in global market demand and supply, necessitating a new method for producing tagatose using common saccharides like sucrose or fructose.
Innovation Solution
A fructose-4-epimerase variant with specific amino acid substitutions is developed, enabling efficient conversion of fructose into tagatose, which is then used to produce tagatose on an industrial scale, utilizing a microorganism expressing this variant or the variant enzyme.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lactose is used as a raw material for tagatose production, then tagatose can be produced through chemical or biological methods, but the production cost becomes unstable due to fluctuations in global lactose market supply and demand
Solution Approach 1:
The patent changes the substrate parameter from lactose to fructose, which is a common and stable raw material. The fructose-4-epimerase enzyme catalyzes the epimerization of fructose at the C4 position to produce tagatose, eliminating dependence on the unstable lactose market while maintaining efficient tagatose production
Solution Approach 2:
The patent extracts the core enzymatic function (fructose-4-epimerase activity) from the lactose-based production system and applies it directly to fructose substrate. This separates the enzyme catalyst from the unstable raw material supply chain, allowing tagatose production to proceed with stable, common saccharides
2Productivity
If conventional fructose-4-epimerase is used for tagatose production, then the conversion process can proceed, but the enzyme shows limited thermal stability and conversion activity
Solution Approach 1:
The patent applies local quality modification by introducing specific amino acid substitutions at key positions (Phe136, Phe320, Ser414) of the fructose-4-epimerase molecule. These localized changes enhance the enzyme's thermal stability and catalytic activity without altering the overall enzyme structure or function
Solution Approach 2:
The patent creates a composite enzyme structure by combining multiple amino acid substitutions (F136F, F320F, S414E) into a single optimized enzyme variant. This composite modification results in synergistic improvements in both thermal stability and conversion activity, enabling efficient industrial tagatose production
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 allows for the economical production of tagatose with improved characteristics, providing a stable and cost-effective alternative to traditional methods by utilizing fructose as a common saccharide substrate.
Implementation Method 1
a fructose-4-epimerase variant having improved conversion activity or stability, and a method of preparing tagatose using the same
Implementation Method 2
fructose-4-epimerase activity; converts fructose, which is a common saccharide, into tagatose
Data Source
AI summary
Provided are a fructose-4-epimerase variant having tagatose conversion activity, and a method of preparing tagatose using the same.