Alpha-Amylase Variants Balancing Activity, Stability, and Ca2+ Dependency
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Solution Overview
Problem
Current alpha-amylases used in industrial processes lack improved specific activity, tailored substrate specificity, enhanced thermal and pH stability, and reduced Ca2+ dependency, which are essential for efficient starch conversion and cleaning applications.
Innovation Solution
Development of novel alpha-amylolytic variants with specific mutations in the amino acid sequence of parental alpha-amylases, such as Spezyme Xtra or AmyS-like enzymes, to alter properties like specific activity, substrate specificity, thermal stability, pH stability, and Ca2+ dependency, resulting in improved performance in starch processing and cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If mutations are introduced into parental alpha-amylase to improve specific activity and substrate specificity, then enzyme performance in starch conversion is improved, but thermal stability and pH stability may be compromised
Solution Approach 1:
The patent applies parameter changes by systematically mutating specific amino acid residues at defined positions in the alpha-amylase sequence to optimize enzyme performance. Multiple mutations are combined in various configurations to achieve desired balances between activity and stability parameters
Solution Approach 2:
The patent creates composite enzyme variants by combining multiple mutations within a single protein sequence. These composite variants integrate beneficial properties from different mutation sites to achieve improved overall performance that balances activity and stability
2Stability of the object's composition
If mutations are introduced to enhance thermal stability and pH stability, then enzyme durability in industrial processes is improved, but specific activity and substrate specificity may be reduced
Solution Approach 1:
The patent uses parameter changes by mutating amino acid residues at positions known to influence pH stability while monitoring the impact on catalytic activity. The systematic approach allows optimization of pH tolerance without completely sacrificing activity
3Productivity
If Ca2+ dependency is reduced through mutations, then enzyme performance in detergent applications is improved, but substrate binding and cleavage efficiency may be affected
Solution Approach 1:
The patent applies parameter changes by mutating residues in the calcium binding region to reduce dependency on Ca2+ ions. This allows the enzyme to maintain stability and activity in detergent formulations where calcium levels may vary, while preserving essential substrate binding capabilities
4Adaptability or versatility
If amino acid sequence is altered to achieve tailored substrate specificity, then efficiency in specific applications is improved, but overall enzyme stability and robustness may be compromised
Solution Approach 1:
The patent applies local quality by introducing mutations at specific localized positions in the enzyme sequence that are predicted to influence substrate specificity. These localized changes allow tailoring of substrate preference while minimizing disruption to the overall structural integrity and stability of the enzyme
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 mutated alpha-amylase variants exhibit enhanced specific activity, improved stability, and reduced Ca2+ dependency, leading to improved performance in starch conversion, ethanol production, laundry washing, and other industrial applications.
Implementation Method 1
Alpha (α)-amylases (α-1,4-glucan-4-glucanohydrolases, E.C. 3.2.1.1) constitute a group of enzymes, which catalyze the hydrolysis of starch and other linear and branched 1,4-glucosidic oligo- and polysaccharides
Data Source
AI summary
Described are variants of a parent α-amylase that exhibits an alteration in at least one of the following properties relative to said parent α-amylase: specific activity, substrate specificity, substrate binding, substrate cleavage, thermal stability, pH-dependent activity, pH-dependent stability, oxidative stability, Ca2+ dependency, pI, and wash performance. The variants are suitable for starch conversion, ethanol production, laundry washing, dish washing, hard surface cleaning, textile desizing, and/or sweetener production.