Engineered Glucosyltransferases for Higher Alpha-Glucan, Lower Leucrose
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Solution Overview
Problem
Existing glucosyltransferase enzymes have suboptimal yields of alpha-glucan production and high leucrose production, limiting their effectiveness in polysaccharide synthesis applications.
Innovation Solution
Engineered glucosyltransferases with modified amino acid sequences at specific positions, such as Leu-373, Leu-428, Ala-472, Ala-510, Leu-513, Met-529, Phe-607, Asn-613, Gln-616, Ser-631, Gly-633, Phe-634, Thr-635, or Phe-951, enhance alpha-glucan yield and reduce leucrose yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing glucosyltransferase enzymes are used, then polysaccharide synthesis can be performed, but the alpha-glucan yield is suboptimal and leucrose production is high
Solution Approach 1:
The patent applies parameter changes by modifying specific amino acid residues in the glucosyltransferase enzyme sequence. Multiple amino acid substitutions are introduced at positions including 373, 428, 472, 510, 513, 529, 607, 613, 616, 631, 633, 634, 635, and 951. These parameter changes in the enzyme's primary structure directly improve catalytic efficiency for alpha-glucan production while reducing unwanted leucrose byproduct formation.
Solution Approach 2:
The patent implements local quality by making targeted amino acid substitutions at specific positions within the enzyme sequence rather than uniform modifications. Each substitution is strategically placed at residues that influence substrate binding, catalysis, or product release. This localized modification approach optimizes specific functional regions of the enzyme to enhance alpha-glucan yield while minimizing leucrose production.
2Productivity
If glucosyltransferase enzymes are used for polysaccharide synthesis, then production can proceed, but the efficiency and effectiveness are limited by suboptimal yields
Solution Approach 1:
The patent employs parameter changes through systematic amino acid substitutions that optimize the enzyme's catalytic parameters. The modified enzyme exhibits improved turnover number and substrate affinity, leading to higher and more consistent polysaccharide production. The specific residue modifications enhance the enzyme's ability to maintain stable activity under varying reaction conditions.
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 engineered enzymes achieve higher alpha-glucan yields and lower leucrose yields, improving the efficiency and effectiveness of polysaccharide production.
Implementation Method 1
the non-native glucosyltransferase synthesizes alpha-glucan comprising 1,3-linkages and/or 1,6-linkages
Data Source
AI summary
Disclosed herein are glucosyltransferases with modified amino acid sequences. Such engineered enzymes exhibit improved alpha-glucan product yields and/or lower leucrose yields, for example. Further disclosed are reactions and methods in which engineered glucosyltransferases are used to produce alpha-glucan.