Mutant OPAA Enzymes for Cyclosarin Degradation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current enzymes, such as wild-type organophosphorus acid anhydrolases, have limited catalytic activity against the highly toxic chemical nerve agent GF (cyclohexyl methylphosphonofluoridate), 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 and 342, such as Y212F and V342Y, significantly enhances catalytic efficiency for GF degradation, offering a more effective decontamination and treatment option.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If wild-type OPAA enzyme is used, then the enzyme can degrade various OP compounds, but the catalytic activity against GF is limited
Solution Approach 1:
The patent applies local quality by making specific amino acid substitutions at positions 212 and 342 in the OPAA enzyme sequence. These localized changes at specific sites modify the enzyme's properties to enhance GF degradation activity while preserving its ability to degrade other OP compounds, thus resolving the contradiction between versatility and productivity.
Solution Approach 2:
The patent employs parameter changes by substituting amino acids at positions 212 and 342 with specific residues (such as Y212F, V342Y, or other combinations from the specified groups). These parameter changes in the enzyme's primary structure result in improved catalytic efficiency against GF while maintaining broad substrate specificity.
2Productivity
If amino acid substitutions are made at positions 212 and 342, then catalytic efficiency on GF increases 10-fold, but enzyme structure complexity increases
Solution Approach 1:
The patent resolves this contradiction by applying local quality - making changes only at two specific positions (212 and 342) in the enzyme sequence rather than throughout the entire structure. This localized modification approach achieves 10-fold improvement in GF catalytic efficiency while minimizing increases in overall enzyme complexity.
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 approximately 10 times greater catalytic efficiency on GF compared to wild-type enzymes, providing a superior solution for detoxification and decontamination of surfaces and biological systems.
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 catalytic efficiency of this mutant on GF is approximately 10 times greater that than of the wild-type enzyme
Data Source
AI summary
The invention comprises isolated, mutant, non-wild-type organophosphorus acid anhydrolase (OPAA) enzymes having two site mutations, methods of production, and methods of use to effectively degrade cylcosarin (GF) (cyclohexyl methylphosphonofluoridate) with greater catalytic efficiency than the wild-type OPAA.