CE-7 Perhydrolase Variants for Selective Peracid Generation
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Solution Overview
Problem
Current peroxycarboxylic acid-based disinfectants and bleaching agents are unstable in solution and require expensive enzyme catalysts with limited selectivity for perhydrolysis over hydrolysis, which affects their efficacy and cost-effectiveness in applications such as surface disinfection and laundry care.
Innovation Solution
Development of CE-7 perhydrolase variants with improved specific activity and selectivity for perhydrolysis, allowing for the production of peroxycarboxylic acids from carboxylic acid esters using enzyme catalysts that are structurally classified as carbohydrate esterases, which are more efficient and cost-effective.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional enzyme catalysts are used for perhydrolysis, then peroxycarboxylic acid can be produced, but the enzyme cost is high and selectivity for perhydrolysis over hydrolysis is limited
Solution Approach 1:
The patent applies parameter changes by modifying the amino acid sequence of CE-7 perhydrolase variants to improve both selectivity and cost-effectiveness. Specifically, the invention identifies and modifies key residues in the enzyme's active site to enhance perhydrolysis activity while reducing hydrolysis activity, thereby improving the P/H ratio. This molecular-level parameter change resolves the contradiction by achieving higher selectivity without requiring more expensive enzymes.
Solution Approach 2:
The patent creates improved copies of the natural CE-7 perhydrolase enzyme through protein engineering. By copying the basic enzyme structure and then optimizing it through rational design and directed evolution, the invention produces variant enzymes with enhanced performance. These copied and optimized enzyme variants achieve better selectivity and activity than the natural enzyme, resolving the cost-effectiveness issue while maintaining high selectivity.
2Productivity
If peroxycarboxylic acid is prepared by chemical reaction with strong inorganic acid catalyst, then the reaction proceeds efficiently, but the peroxycarboxylic acid is unstable in solution over time
Solution Approach 1:
The patent uses enzyme catalysts as intermediaries to facilitate the perhydrolysis reaction instead of using strong inorganic acids directly. The enzyme acts as a biocatalytic intermediary that enables the reaction to proceed under milder conditions, producing peroxycarboxylic acid in situ. This intermediary approach resolves the stability issue because the enzymatic process allows for controlled generation of the unstable peroxycarboxylic acid immediately before use, rather than requiring its stable storage.
Solution Approach 2:
The patent applies preliminary action by generating the peroxycarboxylic acid in situ right before the disinfection or bleaching application. The enzyme-catalyzed reaction components are prepared separately and then mixed immediately prior to use, ensuring the peroxycarboxylic acid is produced at the moment of application. This timing strategy resolves the stability contradiction by eliminating the storage period where decomposition would occur, while maintaining high reaction efficiency through the enzyme catalyst.
3Quantity of substance
If enzyme catalysts with high perhydrolytic activity are used, then the amount of enzyme required is reduced, but developing such enzymes requires significant research investment
Solution Approach 1:
The patent employs feedback mechanisms in the enzyme development process through directed evolution and high-throughput screening. Researchers create libraries of enzyme variants, screen them for improved perhydrolytic activity and selectivity, and use the results to guide further optimization cycles. This feedback-driven approach systematically reduces the enzyme amount required while managing development complexity through iterative improvement rather than attempting to solve all optimization problems simultaneously.
Solution Approach 2:
The patent segments the enzyme development process into distinct phases: initial identification of CE-7 family enzymes with perhydrolase activity, rational design of specific variants based on structural analysis, directed evolution to enhance activity, and characterization of final variants. This segmentation of the complex development process into manageable stages reduces overall complexity while achieving the goal of reducing enzyme quantity required through progressive optimization.
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 improved CE-7 perhydrolase variants enhance the production of peroxycarboxylic acids, increasing their concentration and stability, thereby improving disinfection and bleaching capabilities while reducing enzyme usage and production costs.
Implementation Method 1
The improved CE-7 perhydrolase variants enhance the production of peroxycarboxylic acids, increasing their concentration and stability
Implementation Method 2
enzymatic perhydrolysis activity are provided
Data Source
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AI summary
Disclosed herein are variants enzymes that are structurally classified as CE-7 enzymes and have perhydrolysis activity. Also disclosed herein is a process for producing peroxycarboxylic acids from carboxylic acid esters using the aforementioned variant enzymes as well as methods and compositions comprising the variant enzymes. Further, disinfectant formulations comprising the peroxycarboxylic acids produced by the processes described herein are provided.