Microbial 2′FL Transporter Activity via Growth Conditions
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Solution Overview
Problem
Current methods do not effectively increase the activity of endogenous transporters in microbial cells to enhance the export of 2′ fucosyllactose, a beneficial human milk oligosaccharide.
Innovation Solution
Subjecting microbial cells to specific growth conditions, such as glucose-limited media or media supplemented with ethanol, to increase the activity of endogenous transporters, thereby enhancing the export of 2′ fucosyllactose, and genetically engineering cells to include modifications that increase transporter activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If microbial cells are genetically engineered to produce 2′FL, then 2′FL synthesis capability is improved, but transporter activity remains insufficient for efficient export
Solution Approach 1:
The patent applies parameter changes by modifying growth conditions (glucose-limited media, ethanol supplementation) to alter the activity state of endogenous transporters. This resolves the contradiction by enabling efficient 2′FL export without requiring additional genetic engineering of transporter genes, thus maintaining high productivity while achieving sufficient export capability.
2Productivity
If endogenous transporter activity is increased through growth conditions, then 2′FL export is improved, but process complexity increases
Solution Approach 1:
The patent employs self-service by utilizing the cell's own endogenous transporters rather than introducing heterologous transporter genes. The growth conditions (glucose limitation, ethanol supplementation) naturally activate these existing transporters, simplifying the genetic engineering requirements while achieving improved export productivity.
3Productivity
If glucose-limited media is used to increase transporter activity, then 2′FL export increases, but growth rate decreases
Solution Approach 1:
The patent implements periodic action through a two-stage fermentation process: first allowing cell growth under standard conditions, then switching to glucose-limited conditions with ethanol supplementation to activate transporter activity and maximize 2′FL export. This temporal separation resolves the contradiction between growth rate and export productivity.
Data Source
AI summary
A fermentation broth which includes a microbial cell which has been subjected to a condition under which the activity an endogenous transporter for 2′ fucosyllactose is increased. Also provided are methods for increasing export of 2′ fucosyllactose from a microbial cell, methods for identifying an endogenous yeast transporter of 2′ fucosyllactose, and microbial cells genetically engineered to increase the activity of an endogenous transporter of 2′ fucosyllactose.