Alpha-1,3 Branching Enzyme Variants for Controlled Glucan Structure
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Solution Overview
Problem
Existing alpha-1,3-branching enzymes have limited modularity in activity, hindering the production of glucan products with defined structures for specific applications.
Innovation Solution
Development of alpha-1,3-branching enzymes with modified amino acid sequences, specifically through targeted amino acid substitutions at key positions, to enhance the formation of alpha-1,3 branches in glucan synthesis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If native alpha-1,3-branching enzymes are used, then basic branching activity is provided, but the modularity and control over branching patterns are limited
Solution Approach 1:
The patent applies parameter changes by systematically modifying amino acid residues at specific positions in the enzyme sequence. Multiple substitutions are introduced at key positions (such as positions 734, 735, 737, 740, 772, 773, 778, 779, 780, 846, 852, 855, 858, 859, 1232, 1234) to alter enzyme activity and branching patterns, enabling controlled production of glucan products with defined structures
Solution Approach 2:
The patent implements local quality by making targeted amino acid substitutions at specific positions within the enzyme structure rather than uniform modifications throughout. This allows different regions of the enzyme to have specialized functions, with particular emphasis on modifying active site residues and substrate binding regions to control branching activity while maintaining overall enzyme stability
2Manufacturing precision
If amino acid substitutions are made to enhance branching activity, then structural definition of glucan products is improved, but enzyme stability may be compromised
Solution Approach 1:
The patent systematically varies amino acid substitutions at multiple positions to optimize the balance between branching activity and enzyme stability. By testing different combinations of substitutions at key positions, the invention identifies variants that maintain structural integrity while achieving desired branching patterns in glucan products
Solution Approach 2:
The patent creates a library of enzyme variants with different amino acid substitutions to dynamically explore the relationship between enzyme structure and function. This allows selection of optimal variants for specific applications, balancing branching activity enhancement with maintenance of enzyme stability under various 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 modified enzymes enable the production of glucan products with controlled branching patterns, offering improved structural definition and versatility for various applications.
Implementation Method 1
The modified enzymes enable the production of glucan products with controlled branching patterns
Data Source
AI summary
Disclosed herein are glucosyltransferases with modified amino acid sequences. Such engineered enzymes have modified alpha- 1,3-branching activity. Further disclosed are reactions and methods in which engineered glucosyltransferases can be used to add one or more alpha-1,3 branches to a suitable acceptor such as glucan.