Mutated Pullulanase Enzyme Design for Substrate Affinity
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Solution Overview
Problem
Current methods for using pullulanase enzymes to hydrolyze α-1,6-glycosidic linkages are limited by the need for labor-intensive processes to modify enzyme properties, such as substrate specificity and activity, which can result in suboptimal product yields and inefficient enzyme usage.
Innovation Solution
A method for designing mutated pullulanase enzymes by identifying and modifying specific amino acids, such as Phe476, to enhance substrate affinity and specificity, utilizing X-ray analysis and three-dimensional structure comparisons to guide mutations, thereby improving enzyme performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional methods are used to modify pullulanase properties, then labor-intensive processes are required, but productivity is reduced
Solution Approach 1:
The patent changes the amino acid sequence parameters of pullulanase by introducing specific mutations (such as F476S, F476G, F476A substitutions) to modify enzyme properties including substrate specificity and activity. This systematic parameter change approach replaces labor-intensive trial-and-error methods with targeted molecular modifications based on structural analysis.
2Productivity
If enzyme concentration is increased to improve product yield, then reaction efficiency increases, but enzyme cost and process complexity increase
Solution Approach 1:
The patent modifies the enzyme's catalytic parameters through amino acid substitutions, specifically targeting residues involved in substrate binding and catalysis. These parameter changes enhance the enzyme's specific activity and substrate affinity, allowing reduced enzyme concentrations to achieve the same productivity, thereby lowering costs and simplifying the process.
3Adaptability or versatility
If substrate specificity is broadened to increase applications, then enzyme versatility improves, but manufacturing precision of specific products decreases
Solution Approach 1:
The patent applies local quality changes by introducing site-specific amino acid mutations in key regions of the enzyme (such as the substrate binding pocket around residue 476) while maintaining the overall enzyme structure. This allows selective enhancement of activity toward specific substrates like pullulan or amylopectin, achieving both improved versatility and maintained manufacturing precision for target products.
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 method allows for the creation of enzymes with improved activity and substrate specificity, reducing the amount of enzyme required and expanding its applications, leading to increased product yields and novel uses.
Implementation Method 1
making good use of an X-ray analysis technology for a crystalline structure
Implementation Method 2
Pullulanase (EC 3.2.1.41) is an enzyme hydrolyzing an α-1,6 linkage of, for example, amylopectin in starch
Data Source
AI summary
A method for making a mutated pullulanase enzyme that hydrolyzes an α-1,6-glycosidic linkage is provided. The method includes obtaining the amino acid sequence of a pullulanase enzyme having an amino acid sequence that is at least 95% identical to the amino acid sequence set forth in SEQ ID NO: 13; identifying an amino acid to be mutated in the pullulanase enzyme of step (1), wherein the amino acid to be mutated corresponds to the amino acid at position Phe476 of SEQ ID NO: 2; constructing a mutated amino acid sequence by substituting the amino acid to be mutated with another amino acid or deleting the amino acid to be mutated, thereby making a mutated pullulanase enzyme having the mutated amino acid sequence that has increased affinity for pullulan and that hydrolyzes an α-1,6-glycosidic linkage.