Protease-Resistant Cellulase Variants for Durable Laundry Performance
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Solution Overview
Problem
Cellulases in detergents are unstable in the presence of proteases, leading to degradation and reduced effectiveness in laundry processes.
Innovation Solution
Development of cellulase variants with increased stability in the presence of proteases, achieving at least 90% sequence identity to specific SEQ IDs and maintaining endoglucanase activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cellulase is used in detergent composition with protease, then detergent cleaning performance is improved, but cellulase stability is reduced due to protease degradation
Solution Approach 1:
The patent applies parameter changes by modifying the amino acid sequence of cellulase through site-directed mutagenesis. Specific residues are mutated to alter the enzyme's structural properties and resistance to proteolytic degradation, while maintaining its catalytic activity and detergent performance benefits
Solution Approach 2:
The patent introduces protease-resistant cellulase variants as an intermediary solution. These modified enzymes act as a bridge between the need for protease inclusion in detergents and the requirement for cellulase stability, allowing both enzymes to coexist without the cellulase being degraded
2Productivity
If cellulase is used in detergent, then textile treatment benefits are achieved, but enzyme degradation occurs in the washing solution
Solution Approach 1:
The patent modifies physical-chemical parameters of the cellulase molecule through amino acid substitutions. These changes enhance the enzyme's structural stability and resistance to degradation in the washing solution environment, while preserving its ability to treat textiles effectively
3Productivity
If protease is added to detergent composition, then stain removal is improved, but other proteins including cellulase are degraded
Solution Approach 1:
The patent converts the harmful proteolytic degradation into a beneficial situation by creating cellulase variants that are resistant to protease attack. The harmful factor (protease activity) is transformed into a selective pressure that has been overcome through enzymatic engineering, allowing both enzymes to function synergistically
Solution Approach 2:
The patent changes the molecular parameters of cellulase through targeted amino acid mutations, making the enzyme less susceptible to protease degradation while maintaining its functional properties and allowing coexistence with protease in the detergent system
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 stabilized cellulase variants enhance the durability and performance of detergents by maintaining enzymatic activity in the presence of proteases, improving color clarification, anti-pilling, and whiteness of textiles.
Implementation Method 1
variants having endoglucanase activity
Implementation Method 2
cellulose degrading enzymes
Data Source
AI summary
Disclosed is variants of a cellulase having improved stability in the presence of a protease, and the use of such variants in laundry.