Variant Alkaline Protease Stability and Activity
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Solution Overview
Problem
Current alkaline proteases used in industrial applications lack stability and activity at high temperatures and varying pH levels, and are not effective in both soft and hard water environments, with limited shelf life and susceptibility to oxidizing and chelating agents.
Innovation Solution
Development of variant alkaline proteases with specific amino acid substitutions at positions 18, 21, 24, 53, 58, 91, 130, 234, and 246, which exhibit improved thermostability, pH stability, and activity, maintaining at least 96% identity to parent enzymes, and are more resistant to oxidizing and chelating agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current alkaline proteases are used in industrial applications, then they can perform basic cleaning functions, but they lack stability and activity at high temperatures and varying pH levels
Solution Approach 1:
The patent applies parameter changes by modifying amino acid residues at specific positions (18, 21, 24, 53, 58, 91, 130, 234, 246) in the alkaline protease sequence. These sequence modifications alter the enzyme's physical and chemical parameters, resulting in improved thermostability, pH stability, and resistance to oxidizing and chelating agents while maintaining catalytic activity.
2Adaptability or versatility
If current alkaline proteases are used in hard water environments, then they can function in diverse water conditions, but their effectiveness is reduced due to susceptibility to chelating agents
Solution Approach 1:
The patent modifies the enzyme sequence at specific positions to change its chemical properties, enhancing resistance to chelating agents present in hard water. This allows the enzyme to maintain adaptability across different water conditions while improving reliability against specific inhibitors.
3Duration of action of stationary object
If current alkaline proteases are used for storage, then they can be kept at room temperature, but their shelf life is limited due to degradation
Solution Approach 1:
The patent introduces amino acid substitutions that modify the enzyme's structural stability and resistance to degradation. These sequence changes enhance the enzyme's ability to withstand storage conditions, extending shelf life at room temperature while maintaining reliability against degradation factors.
4Productivity
If current alkaline proteases are used in detergent formulations, then they can provide cleaning activity, but their performance is compromised by susceptibility to oxidizing agents
Solution Approach 1:
The patent modifies the enzyme sequence to change its chemical resistance properties. The amino acid substitutions at specific positions protect the enzyme from oxidizing agents commonly found in detergent formulations, allowing it to maintain cleaning activity while improving reliability in harsh chemical environments.
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 alkaline proteases demonstrate enhanced thermostability, pH stability, and activity, offering improved performance in detergent applications and other industrial uses, including leather processing and food processing, with extended shelf life and broader substrate specificity.
Implementation Method 1
Alkaline protease is an enzyme capable of hydrolyzing a broad range of peptide bonds found in both native proteins and synthetic substrates
Data Source
AI summary
The invention is directed to novel alkaline proteases.