Sialylated Oligosaccharide Production via Engineered Bacteria
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Solution Overview
Problem
Current methods are inefficient and costly for producing purified human milk oligosaccharides, particularly sialylated oligosaccharides like 3′-sialyllactose and 6′-sialyllactose, due to limitations in chemical synthesis and the difficulty of purification from natural sources.
Innovation Solution
Genetically modified bacteria are engineered to produce sialylated oligosaccharides using lactose-utilizing sialyltransferase enzymes that create α(2,3) and α(2,6) glycosidic linkages, allowing for the production of oligosaccharides identical to those found in human milk, with enhanced UDP-GlcNAc and CMP-Neu5Ac production and a deficient sialic acid catabolic pathway to increase yields and purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If chemical synthesis methods are used to produce sialylated oligosaccharides, then production cost and complexity increase, but production efficiency and purity decrease
Solution Approach 1:
The patent employs genetically modified bacteria that autonomously produce sialylated oligosaccharides through endogenous metabolic pathways. The bacteria take up lactose and automatically convert it to sialylated oligosaccharides using expressed sialyltransferase enzymes, eliminating the need for complex chemical synthesis procedures and manual purification steps.
Solution Approach 2:
The patent replaces complex chemical synthesis mechanisms with biological enzymatic mechanisms. Instead of using multiple chemical reagents and harsh reaction conditions, the system uses genetically engineered bacteria with specific sialyltransferase enzymes to catalyze the formation of sialylated oligosaccharides under mild physiological conditions.
2Manufacturing precision
If purification methods are applied to obtain purified sialylated oligosaccharides from natural sources, then purity improves, but production cost and time increase
Solution Approach 1:
The patent extracts only the essential functional component (sialyltransferase enzyme activity) from complex natural sources and transfers it into a simplified bacterial system. By expressing specific sialyltransferase genes in genetically modified bacteria, the system produces highly purified sialylated oligosaccharides directly in the culture medium, eliminating the need for extensive purification procedures.
Solution Approach 2:
The patent changes the production parameters from chemical synthesis conditions to biological fermentation conditions. The genetically modified bacteria produce sialylated oligosaccharides under controlled fermentation parameters (temperature, pH, nutrient composition), which naturally favor the accumulation of pure product without requiring complex downstream purification.
3Manufacturing precision
If sialyltransferase enzymes are engineered for specific linkage production, then product specificity improves, but enzyme complexity and development cost increase
Solution Approach 1:
The patent applies local quality by expressing specific sialyltransferase enzyme variants that catalyze formation of particular glycosidic linkages (α(2,3) or α(2,6)). Different bacterial strains are engineered with specific enzyme variants tailored to produce specific sialylated oligosaccharide structures, allowing precise control over product specificity without requiring complex multi-enzyme systems.
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
This approach enables efficient and economical production of sialylated oligosaccharides with reduced side products, improving the safety and cost-effectiveness of obtaining these valuable compounds for therapeutic and nutritional applications.
Implementation Method 1
The enzymes provided herein are able to sialylate lactose, generating either α(2,3) glycosidic linkages, α(2,6) linkages, or mixtures of α(2,3) and α(2,6) linkages to lactose
Data Source
AI summary
Provided herein, inter alia, are methods, bacteria, nucleic acids, and polypeptides for producing sialylated oligosaccharides.