Glucose Oxidase Mutants for Shorter Electron Transfer Pathways
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Solution Overview
Problem
Current glucose oxidases in electrochemical sensors suffer from low electron transfer efficiency due to elongated electron transport pathways and structural inconsistencies during immobilization, leading to diminished performance.
Innovation Solution
A glucose oxidase mutant with specific mutations (G108K, G419K or G108D, G419D) is engineered to achieve a uniform structural orientation, reducing electron mediator distance and enhancing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional immobilization methods (adsorption, covalent binding, cross-linking, embedding) are used for glucose oxidase, then the enzyme can be stabilized and immobilized, but the electron transfer efficiency remains low due to elongated electron transport pathways
Solution Approach 1:
The patent applies parameter changes by introducing specific point mutations (G108K, G419K, G108D, G419D) into the glucose oxidase enzyme sequence. These mutations alter the enzyme's structural parameters to optimize electron transfer pathways while maintaining stability, directly addressing the contradiction between stability and electron transfer efficiency.
Solution Approach 2:
The patent applies local quality by making specific targeted mutations at particular positions (108 and 419) in the enzyme sequence rather than global changes. This localized modification approach allows optimization of electron transfer pathways in specific regions while preserving the overall enzyme structure and stability.
2Reliability
If glucose oxidase is immobilized using conventional methods, then the enzyme can be retained on the sensor, but the electron transport pathway becomes elongated reducing transfer efficiency
Solution Approach 1:
The patent uses parameter changes through specific amino acid mutations to alter the spatial arrangement and electronic properties of the enzyme, thereby optimizing the electron transport pathway length and efficiency while maintaining proper enzyme retention on the sensor.
Solution Approach 2:
The patent applies dimensionality change by optimizing the three-dimensional structure and spatial arrangement of the enzyme through mutations, creating more efficient electron transfer pathways in multiple spatial dimensions simultaneously.
3Productivity
If structural modifications are made to improve electron transfer, then efficiency may enhance, but enzyme activity could be compromised
Solution Approach 1:
The patent applies local quality by introducing mutations only at specific positions (108 and 419) that are known to affect electron transfer, while leaving the rest of the enzyme structure intact. This localized approach allows efficiency enhancement without compromising overall enzyme activity.
Solution Approach 2:
The patent uses parameter changes through targeted point mutations to optimize electron transfer properties while maintaining the enzyme's catalytic function. The specific mutations (G108K, G419K, G108D, G419D) are designed to improve electron transfer efficiency while preserving essential enzyme activity.
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 mutant glucose oxidase exhibits improved electron transfer efficiency and minimal activity loss, benefiting its use in biosensors.
Implementation Method 1
Glucose oxidase (GOx) is a well-characterized aerobic dehydrogenase that utilizes molecular oxygen as an electron acceptor under aerobic conditions to catalyze the conversion of β-D-glucose to D-gluconolactone and hydrogen peroxide
Implementation Method 2
the currently employed glucose oxidases suffer from low electron transfer efficiency, prompting substantial efforts by researchers to enhance such efficiency
Data Source
AI summary
The present application provides a glucose oxidase mutant, the glucose oxidase mutant has at least one of the following mutations compared to wild-type glucose oxidase: G108K, G419K; or the glucose oxidase mutant has at least one of the following mutations compared to wild-type glucose oxidase: G108D, G419D; the amino acid sequence of the wild-type glucose oxidase is set forth in SEQ ID NO:1.