Trehalose Phosphorylase Mutations for Thermal Stability
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Solution Overview
Problem
Existing trehalose phosphorylases suffer from rapid loss of enzyme activity at moderate temperatures, limiting their industrial application, and current stabilization methods like PEG addition or immobilization are insufficient for high-temperature processes, increasing costs and complicating downstream processing.
Innovation Solution
A trehalose phosphorylase with specific amino acid substitutions, such as at positions 383, 649, and others, exhibits enhanced thermal stability, maintaining residual activity and half-life at 52°C without additional stabilizing agents, allowing for efficient conversion of glucose and alpha-D-glucose 1-phosphate to trehalose.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wild type trehalose phosphorylase is used, then the enzyme can catalyze the conversion of glucose and aG1P to trehalose, but the enzyme activity is rapidly lost at moderate temperatures (25-40°C)
Solution Approach 1:
The patent applies parameter changes by modifying the amino acid sequence of trehalose phosphorylase through site-directed mutagenesis. Specific amino acid residues were changed (e.g., K512A, R507A, E481A, Q487A mutations) to alter the enzyme's thermal stability parameters, resulting in variants that maintain activity at temperatures where the wild type rapidly loses function.
Solution Approach 2:
The patent applies local quality by making targeted local modifications to specific regions of the enzyme molecule. Rather than changing the entire enzyme structure, specific amino acid positions were modified to introduce local structural changes that enhance overall thermal stability while preserving catalytic function.
2Reliability
If PEG or other stabilizing agents are added to improve enzyme stability, then the enzyme maintains activity longer, but the process complexity and downstream processing difficulty increase
Solution Approach 1:
The patent applies self-service by engineering the enzyme to possess inherent thermal stability through amino acid modifications. The modified trehalose phosphorylase variants self-stabilize without requiring external stabilizing agents like PEG, glycerol, or immobilization on carriers, thereby simplifying the overall biocatalytic process.
Solution Approach 2:
The patent applies taking out by removing the need for external stabilizing agents and immobilization matrices. By incorporating stability directly into the enzyme structure through mutation, the patent extracts the stabilization function from separate components (PEG, carriers) and integrates it into the enzyme itself.
3Reliability
If immobilization is used to stabilize the enzyme, then the enzyme shows improved thermal stability, but the production costs increase and downstream processing is complicated
Solution Approach 1:
The modified trehalose phosphorylase variants provide self-stabilization through their engineered amino acid sequences, eliminating the need for immobilization on expensive carrier materials. This self-service approach to stability reduces material costs and simplifies process design.
Solution Approach 2:
The patent creates enzyme variants that are inherently stable and can be used in soluble form without expensive immobilization carriers. The modified enzymes represent a cost-effective alternative to immobilized systems, providing prolonged activity without the need for expensive reusable carriers or complex immobilization procedures.
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 modified trehalose phosphorylase maintains 30-100% residual activity and a half-life of 3-9 days at 45°C, enabling stable industrial production of trehalose without the need for immobilization or stabilizing agents, thus improving process efficiency and reducing costs.
Implementation Method 1
trehalose phosphorylases are enzymes which catalyze the addition of a phosphate group from an inorganic phosphate to an acceptor molecule
Implementation Method 2
catalyzing phosphorolytic cleavage of trehalose with net retention of the anomeric configuration using inorganic phosphate as a glucosyl acceptor into glucose and alpha-D-glucose 1-phosphate
Data Source
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AI summary
The present invention is related to a trehalose phosphorylase comprising an amino acid sequence, wherein the amino acid sequence of the trehalose phosphorylase is at least 80% identical to and/or at least 80% homologous to an amino acid sequence of SEQ ID NO:1, wherein the amino acid sequence of the trehalose phosphorylase comprises an amino acid substitution at one or more amino acid positions, wherein the one or more amino acid positions is/are selected from the group consisting of amino acid positions of SEQ ID NO: 1 712, 383, 10, 114, 118, 192, 197, 220, 225, 304, 306, 318, 323, 339, 349, 357, 459, 476, 481, 484, 487, 488, 506, 511, 526, 530, 532, 533, 537, 550, 556, 564, 590, 649, 667, 703 and 705.