Metabolically Engineered Cells for Oligosaccharide Mixture Production
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Solution Overview
Problem
Current methods for producing oligosaccharide mixtures are inefficient and costly, often resulting in the synthesis of a single oligosaccharide due to challenges in stereospecificity and regioselectivity of glycosyltransferases, and require laborious chemical synthesis or purification from natural sources.
Innovation Solution
A metabolically engineered cell expressing at least three glycosyltransferases capable of synthesizing nucleotide-sugars is cultivated under specific conditions to produce a mixture of at least four different neutral non-fucosylated oligosaccharides, with the option to separate and purify one or more of these oligosaccharides from the cultivation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If chemical synthesis methods are used to produce oligosaccharides, then oligosaccharides can be produced, but the process becomes laborious and time-consuming with difficulty in scaling up
Solution Approach 1:
The patent replaces chemical synthesis methods with a biological system (metabolically engineered cells) that naturally performs oligosaccharide synthesis through enzymatic pathways. This substitution eliminates the need for complex chemical reaction steps, purification protocols, and specialized equipment while dramatically improving production efficiency and scalability.
Solution Approach 2:
The metabolically engineered cells are designed to autonomously synthesize oligosaccharides using their own metabolic machinery. The cells express multiple glycosyltransferases and nucleotide-sugar synthesizing enzymes, allowing them to self-assemble the required enzymatic pathways and produce oligosaccharide mixtures without external intervention beyond substrate provision.
2Quantity of substance
If purification from natural sources is used to obtain oligosaccharides, then oligosaccharides can be obtained, but the availability is limited and the process is inefficient
Solution Approach 1:
The patent fundamentally changes the production parameter from extraction/purification of natural sources to de novo synthesis in engineered cells. This parameter change enables unlimited production scalability while maintaining high efficiency, as the cells can continuously produce oligosaccharides as long as they are provided with basic substrates like lactose and glucose.
3Manufacturing precision
If single glycosyltransferase approaches are used, then stereospecificity and regioselectivity are achieved, but only a single oligosaccharide is produced instead of a mixture
Solution Approach 1:
The patent creates a universal production system where a single metabolically engineered cell strain simultaneously performs multiple functions: it expresses multiple different glycosyltransferases (at least three) along with nucleotide-sugar synthesizing enzymes, enabling the production of diverse oligosaccharide mixtures (at least four different neutral non-fucosylated oligosaccharides) from common substrates.
Solution Approach 2:
The patent merges multiple enzymatic pathways within a single cell system. Different glycosyltransferases with distinct specificities are co-expressed along with nucleotide-sugar synthesizing enzymes, creating an integrated system that produces a mixture of oligosaccharides rather than requiring separate purification steps for individual compounds.
4Productivity
If cell-based production systems are used, then enzymatic advantages are achieved, but tight control of spatiotemporal availability of nucleotide-sugar donors is required
Solution Approach 1:
The metabolically engineered cells are equipped with endogenous nucleotide-sugar synthesizing enzymes that autonomously produce the required nucleotide-sugar donors within the cell. This self-service capability eliminates the need for external addition and precise temporal control of multiple substrates, as the cell's metabolic machinery automatically supplies the necessary activated sugar donors for glycosyltransferase activity.
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 method enables the efficient and cost-effective production of a diverse oligosaccharide mixture, overcoming the limitations of existing technologies by achieving the synthesis of multiple neutral non-fucosylated oligosaccharides in a single cell, thereby enhancing scalability and reducing production time.
Implementation Method 1
Glycosyltransferases catalyze the transfer of a sugar moiety from an activated nucleotide-sugar donor onto saccharide or non-saccharide acceptors
Implementation Method 2
the cell is capable to synthesize (a) nucleotide-sugar(s) that is/are donor(s) for said glycosyltransferases
Data Source
AI summary
The present invention is in the technical field of synthetic biology and metabolic engineering. More particularly, the present invention is in the technical field of fermentation of metabolically engineered cells. The present invention describes a metabolically engineered cell for production of a mixture of at least three different neutral non-fucosylated oligosaccharides. Furthermore, the present invention provides a method for the production of a mixture of at least three different neutral non-fucosylated oligosaccharides by a cell as well as the purification of at least one of said oligosaccharides from the cultivation.