Glucose Oxidase Mutants for Uniform Electrode Orientation
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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 glucose oxidase is used in electrochemical sensors, then the sensor can detect glucose, but the electron transfer efficiency is low due to elongated electron transport pathways
Solution Approach 1:
The patent applies parameter changes by mutating specific amino acid residues (Gly108 and Gly419) to Lys or Asp, which alters the local charge distribution and structural parameters of glucose oxidase. This enables the enzyme to adopt a uniform orientation with the heme group closer to the electrode surface, shortening the electron transport pathway and improving electron transfer efficiency
Solution Approach 2:
The patent applies local quality by introducing charged amino acids (Lys or Asp) at specific local positions (residues 108 and 419) near the heme group. This creates localized charge interactions that orient the enzyme uniformly on the electrode surface, improving electron transfer without requiring changes to the entire enzyme structure or immobilization methodology
2Reliability
If conventional glucose oxidase is immobilized using adsorption, covalent binding, cross-linking, or embedding methods, then the enzyme can be fixed on the electrode, but structural inconsistencies occur leading to low electron transfer efficiency
Solution Approach 1:
The patent changes the biochemical parameters of glucose oxidase by introducing point mutations at residues 108 and 419. These mutations create consistent charge patterns that drive uniform orientation during immobilization, eliminating structural inconsistencies regardless of the immobilization method used (adsorption, covalent binding, cross-linking, or embedding)
Solution Approach 2:
The patent applies self-service by engineering the glucose oxidase mutant to possess intrinsic properties (charged residues at specific positions) that automatically guide uniform orientation and stable attachment to the electrode surface. The enzyme self-organizes in a consistent configuration without requiring precise control of external immobilization conditions, reducing structural variability
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, enabling higher sensitivity and current levels in biosensors with minimal activity loss.
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
catalyze the conversion of β-D-glucose to D-gluconolactone and hydrogen peroxide
Implementation Method 3
the currently employed glucose oxidases suffer from low electron transfer efficiency, prompting substantial efforts by researchers to enhance such efficiency
Data Source
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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.