Oxidation Stable Alpha-Amylase Variants in Bleaching Detergents
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Solution Overview
Problem
Existing alpha-amylase variants used in detergents, particularly dishwashing detergents, are unstable in the presence of bleaching agents, leading to reduced activity and performance.
Innovation Solution
Development of an alpha-amylase variant with a M202L substitution, maintaining at least 80% sequence identity to a parent alpha-amylase, which provides oxidation stability and improved wash performance by incorporating a M202L substitution and potential deletions in specific positions, such as R181, G182, D183, and G184, while maintaining alpha-amylase activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If alpha-amylase is used in detergents containing bleaching agents, then stain removal performance is improved, but enzyme stability is reduced due to oxidation
Solution Approach 1:
The patent applies parameter changes by substituting amino acid residues at specific positions (197, 202, and combinations with 183-184 deletions) in the alpha-amylase protein sequence. These molecular-level parameter changes modify the enzyme's chemical structure to resist oxidation from bleaching agents while preserving catalytic activity for starch hydrolysis and stain removal.
Solution Approach 2:
The invention creates composite functional properties by combining multiple mutations (deletions at 183-184 with substitutions at 197 and/or 202) to achieve both oxidation stability and enzymatic activity. The composite mutation pattern produces an enzyme that simultaneously exhibits bleaching resistance and stain removal capability.
2Reliability
If methionine at position 197 is substituted with leucine to stabilize against oxidation, then oxidation stability is improved, but alpha-amylase activity is reduced
Solution Approach 1:
The patent refines the parameter change approach by combining the M197L substitution with deletions at positions 183-184 and/or M202 substitution. This composite parameter change compensates for the activity loss caused by M197L alone, restoring catalytic function while maintaining oxidation stability.
Solution Approach 2:
The multi-mutation variant achieves multiple functions simultaneously: the deletions and substitutions work together to provide both oxidation resistance (stability function) and maintained enzymatic activity (catalytic function), making the enzyme universally effective in bleaching-containing detergent formulations.
3Reliability
If amino acid deletions and substitutions are introduced to improve oxidation stability, then stability in bleaching systems is improved, but sequence identity to parent enzyme decreases
Solution Approach 1:
The patent applies targeted parameter changes by modifying only specific critical positions (183-184 deletions, 197 and 202 substitutions) rather than extensive random mutations. This focused approach achieves oxidation stability while minimizing overall sequence divergence from the parent enzyme, maintaining 80-95% identity.
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 exhibits enhanced stability and wash performance in detergents containing bleaching systems, ensuring effective stain removal without compromising enzyme activity.
Implementation Method 1
Alpha-amylases (alpha-1,4-glucan-4-glucanohydrolases, E.C. 3.2.1.1) constitute a group of enzymes, which catalyses hydrolysis of starch and other linear and branched 1,4-gluosidic oligo- and polysaccharides.
Implementation Method 2
Some detergents, in particular dishwashing detergents, comprise bleaching systems, bleach activators, and bleach catalysts which are all very destabilizing for the alpha-amylases due to oxidation of the molecules. Therefore, it is important to find alpha-amylase variants, which are stable, have high wash performance, stain removal effect and/or activity in detergents comprising various bleaching agents.
Data Source
AI summary
The present invention relates to oxidation stable alpha-amylase variants. The present invention also relates to polynucleotides encoding the variants; nucleic acid constructs, vectors, and host cells comprising the polynucleotides; and methods of using the variants.