Combinatorial Alpha-Amylase Variants for Low-pH and Detergent Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing α-amylases do not effectively combine desirable qualities such as increased low pH stability and starch liquefaction activity, and there is a need for robust engineered α-amylases with improved detergent stability and cleaning performance.
Innovation Solution
Development of recombinant variant α-amylases with specific mutations at key amino acid residues, such as R375Y, S360A, N126Y, F153W, T180H, E187P, and optional deletions at R178, G179, T180, and G181, enhancing stability and activity under varying conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple mutations are combined in α-amylase to improve starch liquefaction activity, then enzymatic activity increases, but protein stability decreases
Solution Approach 1:
The patent applies parameter changes by systematically varying amino acid residues at specific positions (R375, S360, N126, F153, T180, E187, I203) to optimize the balance between enzymatic activity and protein stability. By changing the chemical and physical parameters of the protein structure at these key positions, the invention achieves enhanced low pH stability while maintaining high starch liquefaction activity.
2Stability of the object's composition
If mutations are introduced to enhance low pH stability, then pH stability improves, but starch liquefaction activity may be compromised
Solution Approach 1:
The patent merges multiple beneficial mutations (R375Y/S360A, N126Y, F153W, T180H, E187P, I203Y) into a single engineered α-amylase protein. This combination allows the enzyme to simultaneously achieve enhanced low pH stability and high starch liquefaction activity, as each mutation contributes specific functional properties that work synergistically together.
3Stability of the object's composition
If engineered mutations are applied to improve detergent stability, then detergent stability increases, but cleaning performance may be reduced
Solution Approach 1:
The patent applies parameter changes by modifying specific amino acid residues (R375, S360, N126, F153, T180, E187, I203) to enhance the enzyme's stability in detergent formulations. These mutations improve the protein's resistance to denaturation and aggregation in harsh detergent conditions while preserving its catalytic activity for starch degradation, thereby maintaining cleaning performance.
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 α-amylases exhibit improved low pH stability, starch liquefaction activity, and detergent stability, effectively hydrolyzing starch components for stain removal and enhancing cleaning performance.
Implementation Method 1
α-amylases hydrolyze starch, glycogen, and related polysaccharides by cleaving internal a-1,4-glucosidic bonds
Data Source
AI summary
Disclosed are compositions and methods relating to variant alpha-amylases. The variant alpha-amylases are useful, for example, for starch liquefaction and saccharification, for cleaning starchy stains in laundry, dishwashing, and other applications, for textile processing (e.g., desizing), in animal feed for improving digestibility, and for baking and brewing.