Alpha-Amylase Variants With Targeted Mutations for Stability and Activity
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Solution Overview
Problem
There is a need for alpha-amylases with altered biochemical characteristics to improve performance in industrial applications such as starch conversion, ethanol production, laundry, dishwashing, pulp and paper production, and sweetener production, as existing alpha-amylases may not offer optimal stability and activity in these contexts.
Innovation Solution
Development of alpha-amylase variants with specific amino acid substitutions at defined positions in the amino acid sequence, leading to enhanced stability and activity, including variants with substitutions at positions such as 7, 29, 53, 60, 72, 87, 108, 116, 126, 128, 129, 130, 131, 134, 136, 138, 142, 156, 161, 165, 178, 182, 185, 192, 195, 197, 202, 210, 214, 217, 234, 246, 269, 303, 310, 337, 340, 374, and 401, which result in improved performance indices for stability and activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If wild-type alpha-amylase is used, then the enzyme is stable and active under normal conditions, but it does not provide optimal performance in diverse industrial applications with varying pH, temperature, and substrate conditions
Solution Approach 1:
The patent applies parameter changes by systematically modifying specific amino acid residues at defined positions (e.g., positions 7, 29, 53, 60, 72, 87, 108, 116, 126, 128, 129, 130, 131, 134, 136, 138, 142, 156, 161, 165, 178, 182, 185, 192, 195, 197, 202, 210, 214, 217, 234, 246, 269, 303, 310, 337, 340, 374, and 401) in the alpha-amylase protein sequence. These parameter changes in amino acid composition result in variants with improved performance indices greater than 1.0 for both stability and activity, enabling the enzyme to adapt to diverse industrial conditions including varying pH levels, temperatures, and substrate types while maintaining reliable and consistent performance.
2Productivity
If alpha-amylase variants with improved activity are developed, then catalytic efficiency increases, but protein stability and durability may be compromised
Solution Approach 1:
The patent applies local quality by making targeted modifications at specific positions in the protein sequence rather than random mutations. Each position (7, 29, 53, 60, 72, 87, 108, 116, 126, 128, 129, 130, 131, 134, 136, 138, 142, 156, 161, 165, 178, 182, 185, 192, 195, 197, 202, 210, 214, 217, 234, 246, 269, 303, 310, 337, 340, 374, and 401) was selected based on its functional importance, allowing the variant to achieve improved catalytic activity while preserving overall protein stability and structural integrity.
Solution Approach 2:
The patent creates composite enzyme variants by combining multiple amino acid substitutions at different positions to achieve synergistic effects. The composite nature of these variants, with multiple specific residues modified simultaneously, allows the enzyme to achieve performance indices greater than 1.0 for both activity and stability, indicating that the combined effects of multiple mutations produce enhanced catalytic efficiency while maintaining protein durability.
3Adaptability or versatility
If existing alpha-amylase is used in industrial processes, then the process is simple and cost-effective, but the enzyme may not maintain optimal activity under extreme pH, temperature, or high substrate concentration conditions
Solution Approach 1:
The patent applies parameter changes by modifying specific amino acid residues at defined positions to enhance the enzyme's adaptability to extreme conditions. The systematic approach of changing parameters at specific locations (positions 7, 29, 53, 60, 72, 87, 108, 116, 126, 128, 129, 130, 131, 134, 136, 138, 142, 156, 161, 165, 178, 182, 185, 192, 195, 197, 202, 210, 214, 217, 234, 246, 269, 303, 310, 337, 340, 374, and 401) enables the variant to maintain optimal activity under extreme pH, temperature, and substrate concentration conditions while following a structured development methodology.
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 alpha-amylase variants demonstrate improved cleaning performance, detergent stability, thermostability, and protein expression, achieving performance indices greater than 1.0 for activity and stability, thereby enhancing their effectiveness in various industrial applications.
Implementation Method 1
Alpha (α)-Amylases (α-1,4-glucan-4-glucanohydrolases, E.C. 3.2.1.1) are a group of enzymes that hydrolyze starch, glycogen, and related polysaccharides by cleaving internal α-1,4-glucosidic bonds at random
Implementation Method 2
hydrolyze starch, glycogen, and related polysaccharides by cleaving internal α-1,4-glucosidic bonds
Data Source
AI summary
Described are compositions and methods relating to variant alpha-amylases having altered biochemical properties and advantageous performance characteristics as compared to a reference alpha-amylase. The variants are suitable for use in various industrial applications such as starch conversion, ethanol production, laundry, dishwashing, pulp and paper production, textile desizing, and/or sweetener production.