Variant Subtilisin Compositions for Oxidative and Thermal Stability
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Solution Overview
Problem
Existing serine proteases, particularly subtilisins, face challenges in maintaining activity and stability under adverse environmental conditions such as oxidative agents, chelating agents, extreme temperatures, and pH variations, limiting their effectiveness in various applications including laundry cleaning.
Innovation Solution
Development of variant subtilisins with specific amino acid substitutions at defined positions, enhancing their stability and activity under diverse conditions, including encapsulation to protect and control enzyme availability during cleaning processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing subtilisin proteases are used under adverse environmental conditions (oxidative agents, chelating agents, extreme temperatures, pH variations), then cleaning effectiveness is maintained, but enzyme stability and activity are compromised
Solution Approach 1:
The patent applies parameter changes by modifying specific amino acid residues at defined positions in the subtilisin sequence (e.g., positions 40, 61, 62, 97, 124, 126, 128, 144, 162, 217, 275) to enhance enzyme stability. These sequence variations create protease variants with improved resistance to oxidative agents, chelating agents, extreme temperatures, and pH variations while maintaining cleaning effectiveness.
Solution Approach 2:
The patent creates composite enzyme systems by combining subtilisin variants with stabilizing agents and other components in cleaning compositions. This composite approach provides synergistic protection against adverse environmental conditions, where the variant subtilisin provides base stability and the additional components enhance resistance to specific stressors like oxidation and chelation.
2Reliability
If variant subtilisins with multiple amino acid substitutions are developed, then oxidative, thermal, and chelator stability are enhanced, but enzyme complexity increases
Solution Approach 1:
The patent applies local quality by making targeted amino acid substitutions at specific positions (40, 61, 62, 97, 124, 126, 128, 144, 162, 217, 275) rather than throughout the entire enzyme sequence. Each substitution is strategically placed to address specific stability issues (oxidation resistance, thermal stability, chelator resistance) while minimizing overall sequence complexity and maintaining catalytic function.
3Reliability
If encapsulation is used to protect and control enzyme availability, then enzyme stability is improved, but formulation complexity increases
Solution Approach 1:
The patent applies the nested doll principle by encapsulating the variant subtilisin within protective matrices or carriers in the cleaning composition. The enzyme is nested within stabilizing structures that control its release and availability during washing, providing protection against adverse conditions while maintaining simplicity in the overall formulation approach.
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 variant subtilisins exhibit improved stability and performance in laundry cleaning applications, demonstrating enhanced oxidative, thermal, and chelator stability, and maintain effectiveness across varying detergent concentrations, temperatures, and pH levels.
Implementation Method 1
Serine proteases are a subgroup of carbonyl hydrolases comprising a diverse class of enzymes having a wide range of specificities and biological functions. Much research has been conducted on the subtilisins, due largely to their usefulness in cleaning and feed applications.
Data Source
AI summary
The present invention provides variant subtilisins and compositions comprising at least one variant subtilisin set forth herein, as well as methods for using these variants and compositions. In some embodiments, the present invention provides variant subtilisins suitable for laundry cleaning applications.