Bacterial Oligosaccharide Export via Engineered Transporters
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for producing oligosaccharides, such as chemical synthesis and biocatalysis, are not suitable for industrial-scale production at reasonable costs, and existing fermentative processes face challenges in efficiently exporting oligosaccharides from bacterial cells into the culture medium, leading to osmotic stress and increased production costs.
Innovation Solution
Genetically engineered gram-negative bacterial cells expressing saccharide transporters and porins are used to facilitate the intracellular synthesis and export of oligosaccharides from the cytoplasm into the culture medium, reducing osmotic stress and process complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If oligosaccharides are produced by chemical synthesis, then oligosaccharides can be manufactured, but the production cost is high and it is not suitable for industrial scale
Solution Approach 1:
The patent replaces chemical synthesis methods with biocatalytic methods using genetically engineered bacteria. The bacterial cells naturally catalyze the formation of oligosaccharides through enzymatic reactions, eliminating the need for complex chemical synthesis steps including protective group introduction and removal, thereby reducing production costs while maintaining manufacturability
Solution Approach 2:
The patent utilizes the bacterial cell's own metabolic pathways and enzymatic systems to produce oligosaccharides. By engineering the bacteria to express specific glycosyltransferases and transporters, the system uses the organism's natural biochemical machinery to synthesize and export oligosaccharides, eliminating external chemical reagents and complex processing steps
2Ease of manufacture
If oligosaccharides are produced by biocatalysis in vitro, then oligosaccharides can be manufactured, but the production cost is high and it is not suitable for industrial scale
Solution Approach 1:
The patent replaces in vitro biocatalysis with in vivo production using whole bacterial cells. The engineered bacteria perform catalysis within their natural cellular environment, eliminating the need for external enzyme addition, buffer systems, and complex in vitro reaction conditions, thereby reducing production costs while maintaining manufacturability
Solution Approach 2:
The patent utilizes the bacterial cell's own metabolic pathways and enzymatic systems to produce oligosaccharides. By engineering the bacteria to express specific glycosyltransferases and transporters, the system uses the organism's natural biochemical machinery to synthesize and export oligosaccharides, eliminating external enzyme additions and complex in vitro processing
3Ease of manufacture
If oligosaccharides are recovered from culture medium, then process steps are reduced and costs are lowered, but oligosaccharides must be exported from bacterial cells which causes osmotic stress
Solution Approach 1:
The patent introduces membrane transport proteins as intermediaries to facilitate oligosaccharide export. These transporters (such as ABC transporters or MFS transporters) act as mediators between the intracellular synthesis site and the extracellular medium, enabling controlled export that minimizes osmotic stress while allowing recovery from culture medium
Solution Approach 2:
The patent modifies the export kinetics and transport capacity parameters by expressing transporters at optimized levels. This controls the rate and extent of oligosaccharide export, preventing sudden large-scale accumulation in the external medium that would cause osmotic stress, while still enabling sufficient export for cost-effective recovery
4Productivity
If oligosaccharides are accumulated intracellularly, then productivity may increase, but osmotic stress affects bacterial cell health and productivity
Solution Approach 1:
The patent introduces membrane transport proteins as intermediaries to facilitate oligosaccharide export. These transporters (such as ABC transporters or MFS transporters) act as mediators between the intracellular synthesis site and the extracellular medium, enabling controlled export that minimizes osmotic stress while allowing recovery from culture medium
Solution Approach 2:
The patent establishes continuous export of oligosaccharides during the fermentation process through constitutive or inducible expression of transporters. This continuous removal prevents intracellular accumulation that would cause osmotic stress, maintaining bacterial cell health and sustained productivity throughout the cultivation period
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 enhances the translocation of oligosaccharides into the culture medium, improving productivity and reducing production costs by minimizing the need for intracellular accumulation and subsequent osmotic stress, thus making oligosaccharides more viable for industrial-scale production.
Implementation Method 1
possesses a saccharide transporter in its inner membrane and/or a porin in its outer membrane for the translocation of the oligosaccharide of interest from the cells' cytoplasm into the culture medium
Data Source
AI summary
Disclosed are genetically-engineered gram-negative bacterial cells for the production of an oligosaccharide of interest, wherein the bacterial cell possesses a saccharide transporter and/or a porin being expressed from a recombinant gene or a deregulated endogenous gene, thereby facilitating the translocation of the oligosaccharide of interest from the cell's cytoplasm into the cell's environment. Also disclosed are methods for producing an oligosaccharide of interest which used said genetically-engineered gram-negative bacterial cells.