TS23 Alpha-Amylase Variants for Cold Water Starch Cleaning
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Solution Overview
Problem
There is a need for variant alpha-amylases with altered biochemical characteristics that offer improved performance in industrial applications such as starch conversion, ethanol production, laundry, dishwashing, and textile desizing, as existing alpha-amylases do not fully meet the requirements for enhanced cleaning activity, detergent stability, and substrate specificity.
Innovation Solution
Development of variants of the TS-23 alpha-amylase with specific amino acid modifications, including truncation of the C-terminus, deletion of residues R180 and S181, and substitution of residues, which result in increased cleaning activity, detergent stability, and altered substrate specificity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the parent TS-23 alpha-amylase is used, then it has broad pH stability (pH 4.7 to 10.8), but it has limited cleaning activity against starch stains in cold water and moderate detergent stability
Solution Approach 1:
The patent applies parameter changes by modifying the amino acid sequence of the alpha-amylase enzyme through specific mutations (deletion of residues R180 and S181, truncation of C-terminus, and substitution of residue M201). These molecular parameter changes result in the variant enzyme exhibiting enhanced cleaning activity against starch stains in cold water while maintaining detergent stability, directly resolving the contradiction between reliability and productivity.
2Adaptability or versatility
If the parent TS-23 alpha-amylase is used, then it is stable over a broad pH range, but it has temperature optimum at 45°C with reduced activity at lower temperatures
Solution Approach 1:
The patent employs parameter changes by introducing specific amino acid mutations (deletion of R180 and S181, truncation of C-terminus, substitution of M201) that alter the thermal properties of the enzyme. These changes enable the variant alpha-amylase to maintain high activity at lower temperatures while preserving stability across a broad pH range, thereby improving temperature adaptability and low-temperature productivity.
3Productivity
If amino acid modifications are made to increase cleaning activity, then cleaning performance improves, but enzyme stability may be compromised
Solution Approach 1:
The patent applies local quality by making targeted amino acid modifications at specific positions (deletion of R180 and S181, truncation of C-terminus, substitution of M201) rather than random mutations. These localized changes are strategically positioned to enhance cleaning activity while preserving the overall structural stability and functional integrity of the enzyme, thus improving productivity without compromising reliability.
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 variants demonstrate improved cleaning activity against starch stains in cold water and increased detergent stability, enabling more effective starch processing and textile desizing, while maintaining alpha-amylase activity and stability across a broader pH range.
Implementation Method 1
Alpha (a)-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.
Data Source
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AI summary
Described are variants (mutants) of a parent alpha-amylase having alpha-amylase activity and exhibiting altered properties relative to the parent alpha-amylase, and methods of use, thereof.