Mutant OPAA Enzyme Catalytic Efficiency on EA1356
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Solution Overview
Problem
Current enzymes, such as wild-type organophosphorus acid anhydrolases, have limited catalytic efficiency in degrading the toxic chemical nerve agent EA1356, making them marginally useful for decontamination and medical countermeasures.
Innovation Solution
A mutant organophosphorus acid anhydrolase enzyme with specific amino acid substitutions at positions 212, 342, and 215 (Y212F/V342L/I215H) is developed, significantly enhancing its catalytic efficiency in degrading EA1356, achieving approximately four times the activity of the wild-type enzyme.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wild-type organophosphorus acid anhydrolase enzyme is used, then the enzyme can catalyze hydrolysis of organophosphorus compounds, but the catalytic efficiency on EA1356 is limited and marginally useful for decontamination
Solution Approach 1:
The patent applies parameter changes by introducing specific amino acid substitutions (Y212F, V342L, I215H) at defined positions in the enzyme sequence. These mutations alter the enzyme's catalytic parameters, specifically increasing its efficiency toward EA1356 substrate. The changes in amino acid sequence lead to improved binding affinity and catalytic rate, transforming the enzyme from marginally useful to highly effective for decontamination applications.
2Productivity
If native OPAA enzyme is used, then it has catalytic activity against various organophosphorus chemical nerve agents, but greater catalytic efficiencies are desirable and not achieved
Solution Approach 1:
The patent applies local quality by making targeted mutations at specific positions (212, 342, and 215) in the enzyme sequence rather than altering the entire enzyme structure. These localized changes at specific residues create a optimized active site for EA1356 while preserving the enzyme's ability to handle other organophosphorus compounds. This approach enhances catalytic efficiency for the target substrate without completely redesigning the enzyme's functional profile.
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 enzyme demonstrates the highest reported catalytic efficiency for EA1356 degradation, enabling effective in vivo treatment and environmental decontamination of EA1356.
Implementation Method 1
a class of enzymes known as organophosphorus acid ('OPA') anhydrolases ('OPAA') (EC 3.1.8.2) can catalyze the hydrolysis of a variety of OP compounds
Implementation Method 2
The mutant OPAA enzyme increases the catalytic efficiency in the degradation of EA1356 by approximately four times that of the wild-type enzyme
Data Source
AI summary
The invention comprises isolated, mutant, non-wild-type organophosphorus acid anhydrolase (OPAA) enzymes having three site mutations, methods of production, and methods of use to effectively degrade organophosphorus compound EA1356 (2-methylcyclohexyl methylphosphonofluoridate) with greater catalytic efficiency than the wild-type OPAA enzyme.