Alpha-Amylase Variants Balancing Activity, Stability, and Calcium Dependency
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Solution Overview
Problem
Current alpha-amylases used in industrial processes lack increased specific activity, tailored substrate specificity, improved thermal and oxidative stability, and reduced calcium 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 parent alpha-amylases, such as Spezyme Xtra or AmyS, to alter properties like specific activity, substrate specificity, thermal stability, and calcium dependency, resulting in improved performance in starch liquefaction, saccharification, and cleaning processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If mutations are introduced into parent alpha-amylase to improve specific activity and substrate specificity, then enzyme performance in starch conversion is improved, but thermal stability and oxidative stability may be compromised
Solution Approach 1:
The patent applies parameter changes by systematically modifying amino acid residues at specific positions (e.g., positions 6, 13, 14, 15, 16, 18, 20, 21, 25, 27, 29, 36, 39, 50, 52, 53, 54, 67, 71, 73, 75, 77, 80, 81, 83, 85, 90, 92, 107, 111, 113, 114, 120, 121, 126, 128, 131, 133, 137, 138, 139, 141, 143, 147, 149, 150, 151, 152, 155, 160, 165, 168, 172, 173, 177, 188, 191, 192, 193, 196, 200, 201, 202, 213, 216, 217, 220, 221, 227, 232, 235, 237, 238, 240, 246, 249, 250, 252, 253, 254, 255, 257, 258, 268, 272, 274, 275, 279, 283, 285, 293, 294, 297, 300, 301, 306, 309, 312, 313, 317, 318, 319, 320, 338, 339, 340, 343, 345, 363, 366, 369, 370, 375, 379, 381, 385, 386, 391, 392, 393, 394, 400, 402, 403, 404, 406, 407, 410, 413, 414, 416, 419, 422, 427, 433, 436, 439, 442, 445, 447, 448, 450, 452, 455, 463, 465, 469, 471, 473, 476) to optimize the balance between catalytic activity and structural stability. Multiple amino acid substitutions are combined to achieve synergistic effects that simultaneously improve specific activity while maintaining or enhancing thermal and oxidative stability.
2Productivity
If mutations are introduced to reduce calcium dependency, then enzyme performance in cleaning applications is improved, but thermal stability and oxidative stability may be compromised
Solution Approach 1:
The patent applies parameter changes by introducing specific amino acid substitutions that reduce calcium dependency while maintaining stability. Mutations at positions involved in calcium binding (e.g., positions 6, 13, 14, 15, 16, 18, 20, 21, 25, 27, 29, 36, 39, 50, 52, 53, 54, 67, 71, 73, 75, 77, 80, 81, 83, 85, 90, 92, 107, 111, 113, 114, 120, 121, 126, 128, 131, 133, 137, 138, 139, 141, 143, 147, 149, 150, 151, 152, 155, 160, 165, 168, 172, 173, 177, 188, 191, 192, 193, 196, 200, 201, 202, 213, 216, 217, 220, 221, 227, 232, 235, 237, 238, 240, 246, 249, 250, 252, 253, 254, 255, 257, 258, 268, 272, 274, 275, 279, 283, 285, 293, 294, 297, 300, 301, 306, 309, 312, 313, 317, 318, 319, 320, 338, 339, 340, 343, 345, 363, 366, 369, 370, 375, 379, 381, 385, 386, 391, 392, 393, 394, 400, 402, 403, 404, 406, 407, 410, 413, 414, 416, 419, 422, 427, 433, 436, 439, 442, 445, 447, 448, 450, 452, 455, 463, 465, 469, 471, 473, 476) are designed to reduce calcium dependency while compensating for potential stability losses through additional stabilizing mutations elsewhere in the protein structure.
3Productivity
If multiple mutations are combined to achieve improved properties, then overall enzyme performance is enhanced, but the complexity of enzyme production and characterization increases
Solution Approach 1:
The patent applies segmentation by dividing the enzyme optimization into distinct modular components: specific activity enhancement mutations, thermal stability mutations, oxidative stability mutations, and calcium dependency reduction mutations. Each module can be independently designed, introduced, and characterized, allowing systematic optimization without overwhelming complexity. The modular approach enables stepwise improvement and facilitates enzyme production through standardized protocols.
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 thermal and oxidative stability, and reduced calcium dependency, leading to more efficient starch conversion and cleaning performance, particularly in laundry and dish washing 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
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AI summary
Described are variants of a parent alpha-amylase that exhibits an alteration in at least one of the following properties relative to said parent alpha-amylase: specific activity, substrate specificity, substrate binding, substrate cleavage, thermal stability, pH-dependent activity, pH-dependent stability, oxidative stability, calcium 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.