Beta-1,2-Oligoglucan Enzymatic Synthesis With Controlled Polymer Length
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Solution Overview
Problem
Existing methods for producing β-glucans, particularly β-1,2-oligoglucans, face challenges in achieving consistent, reproducible, and cost-effective production due to variations in physicochemical properties and high costs associated with nucleotide-activated donor sugars.
Innovation Solution
A method involving the use of α-D-glucose-1-phosphate (G1P) and beta (β)-glucan-phosphorylase (βGP) to produce 1,2-beta-oligoglucans, with optional inclusion of alpha(α)-glucan-phosphorylase (αGP) and inorganic phosphate, utilizing substrates like maltodextrin, starch, and trehalose, under specific pH conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If commercial β-glucans are produced from cell wall extracts of yeasts, fungi, and plants, then β-glucans can be obtained through extraction processes, but significant variations in physicochemical and functional properties occur including branching pattern, molecular weight distribution, viscosity, and concentration
Solution Approach 1:
The patent replaces mechanical extraction methods with enzymatic synthesis. Instead of extracting β-glucans from biological sources through physical and chemical extraction processes, the invention uses beta-glucan phosphorylase enzymes to catalyze the formation of β-1,2-glucan polymers from glucose-1-phosphate, providing precise control over molecular structure and properties
Solution Approach 2:
The patent employs parameter changes by controlling enzymatic reaction conditions including pH (6.0-7.5), temperature (30-50°C), substrate concentration, and enzyme concentration to produce β-glucans with consistent and reproducible physicochemical properties, eliminating the variability inherent in extraction methods
2Ease of manufacture
If specialized glycosyltransferases are used for the synthesis of β-glucans, then β-glucan production can be achieved, but the high cost of nucleotide-activated donor sugars becomes a serious limitation for commercial exploitation
Solution Approach 1:
The patent substitutes expensive nucleotide-activated donor sugars with inexpensive glucose-1-phosphate as the substrate for β-glucan synthesis. This replacement dramatically reduces material costs while maintaining the ability to produce β-glucans through enzymatic catalysis by beta-glucan phosphorylase
Solution Approach 2:
The patent introduces beta-glucan phosphorylase as an intermediary enzyme that catalyzes the conversion of glucose-1-phosphate to β-1,2-glucan polymers. This enzymatic mediator enables the use of low-cost substrates while achieving controlled synthesis, replacing the need for expensive specialized glycosyltransferases and their required nucleotide donors
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
Produces 1,2-beta-oligoglucans with controlled polydispersity, degree of polymerization, and viscosity, offering a digestible and reproducible composition.
Implementation Method 1
contacting α-D-glucose-1-phosphate (G1P) with a beta (β)-glucan-phosphorylase (βGP) to produce 1,2-beta-oligoglucans
Implementation Method 2
contacting a substrate with an alpha(α)-glucan-phosphorylase (αGP) in the presence of inorganic phosphate to produce the glucose-1-phosphate
Data Source
AI summary
Disclosed herein are compositions and methods for the productions of β-1,2-oligoglucans. Said compositions include glucose-1-phospahte, a prime molecule, and a β-glucan phosphorylase with β-1,2-glucan phosphorylase activity. For example, the βGP with β-1,2-glucan phosphorylase activity may have a sequence at least 70% at least 75%, at least 80%, at least 85%, at least 90%, at least 95%, at least 99%, or 100% identical to at least one of SEQ ID NOs:10, 11, 13, 15, or 16.