V219A Mutant Enzyme Expands Substrate Range in Glucose Production
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Solution Overview
Problem
Existing oligosaccharide debranching enzymes cannot effectively catalyze both linear maltooligosaccharides and isomaltooligosaccharides in glucose mother liquor, limiting the conversion of these substrates into glucose.
Innovation Solution
A mutant oligosaccharide debranching enzyme, V219A, is developed by mutating valine at position 219 to alanine, expanding its substrate range to include linear maltooligosaccharides and isomaltooligosaccharides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If wild-type oligosaccharide debranching enzyme is used, then it can catalyze isomaltooligosaccharides, but it cannot effectively catalyze linear maltooligosaccharides
Solution Approach 1:
The patent applies parameter changes by mutating the amino acid sequence of the oligosaccharide debranching enzyme, specifically changing valine at position 219 to alanine (V219A). This parameter change in the enzyme's primary structure expands its substrate recognition capability, enabling it to effectively catalyze both linear maltooligosaccharides and isomaltooligosaccharides, thereby resolving the contradiction between substrate range and catalytic efficiency.
2Productivity
If multiple enzymes are used to catalyze different oligosaccharides, then complete conversion can be achieved, but the process complexity increases
Solution Approach 1:
The patent implements universality by engineering a single oligosaccharide debranching enzyme mutant (V219A) that performs multiple catalytic functions. This mutant enzyme can simultaneously catalyze both linear maltooligosaccharides and isomaltooligosaccharides, replacing the need for multiple different enzymes. This multi-functional enzyme simplifies the enzyme system while maintaining high glucose conversion rates, thus resolving the contradiction between productivity and device complexity.
3Ease of manufacture
If glucose mother liquor is not further processed, then production cost is low, but economic benefit is reduced due to low-value sales
Solution Approach 1:
The patent converts the previously problematic glucose mother liquor (which contained unwanted oligosaccharides and was difficult to sell) into a valuable resource. By using the V219A mutant enzyme to catalyze the conversion of residual maltooligosaccharides and isomaltooligosaccharides in the mother liquor into additional glucose, the process transforms a waste stream into a source of additional high-value product, thereby resolving the contradiction between ease of manufacture and productivity in terms of economic value.
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 mutant enzyme V219A achieves glucose yields of up to 99.21% from primary mother liquor, 98.89% from secondary mother liquor, and 97.97% from tail liquor, significantly improving glucose production compared to wild-type enzymes.
Implementation Method 1
A mutant oligosaccharide debranching enzyme, V219A, is developed by mutating valine at position 219 to alanine, expanding its substrate range to include linear maltooligosaccharides and isomaltooligosaccharides
Implementation Method 2
The mutant enzyme V219A achieves glucose yields of up to 99.21% from primary mother liquor, 98.89% from secondary mother liquor, and 97.97% from tail liquor
Data Source
AI summary
The invention provides an oligosaccharide debranching enzyme mutant and use thereof in a glucose mother liquor. The mutant is obtained by mutating valine at position 219 in SEQ ID NO: 1 into alanine. According to oligosaccharide debranching enzyme mutant V219A, a primary mother liquor, a secondary mother liquor, or a tail liquid after chromatographic separation is used as a substrate, the percentage contents of glucose in the products are 99.21% (primary mother liquor), 98.89% (secondary mother liquor) and 97.97% (tail liquid after chromatographic separation) respectively, which are 2.86%, 8.64%, and 28.67% higher than that of glucose obtained with the wild-type oligosaccharide debranching enzyme. Therefore, the mutant V219A obviously improves the percentage content of glucose in the glucose mother liquor, and the scope of application of the mother liquor can be expanded by the high product purity and substrate conversion rate, so the mutant V219A has higher industrial application value.