Recombinant Bacillus Bioproduction for High-Yield 2′-Fucosyllactose
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Solution Overview
Problem
Current methods for producing 2′-fucosyllactose, a key human milk oligosaccharide, face challenges such as low stereoselectivity, low total yield, and the use of toxic reagents, making them unsuitable for industrial application, while existing bacterial strains pose safety concerns for consumer acceptance.
Innovation Solution
A recombinant Bacillus sp. microorganism is engineered with a gene expression cassette containing a nucleic acid sequence encoding α-1,2-fucosyl transferase and a regulatory sequence, optimized with constitutive promoters like p12455 and a ribosome binding site, to enhance 2′-fucosyllactose production by blocking degradation pathways and overexpressing membrane transport proteins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If membrane separation technology from goat milk whey is used, then human milk oligosaccharides can be obtained, but the process has low stereoselectivity and low total yield
Solution Approach 1:
The patent replaces the mechanical membrane separation process with a biological enzymatic synthesis system. Instead of physically separating oligosaccharides from goat milk whey, the invention uses recombinant Bacillus sp. microorganisms expressing α-1,2-fucosyl transferase to catalyze the formation of 2'-fucosyllactose with high stereoselectivity and yield.
Solution Approach 2:
The patent optimizes enzymatic reaction parameters including pH (6.0-7.0), temperature (30-37°C), and substrate concentration to achieve high stereoselectivity and yield. The regulatory sequences (p12455 promoter, ribosome binding site) are optimized to maximize enzyme production and catalytic efficiency.
2Productivity
If chemical synthesis methods are used, then 2'-fucosyllactose can be produced rapidly, but toxic reagents are required making them unsuitable for food and pharmaceutical industry
Solution Approach 1:
The patent replaces chemical synthesis with biological enzymatic catalysis. The α-1,2-fucosyl transferase enzyme naturally catalyzes the formation of 2'-fucosyllactose without requiring toxic reagents, making the process suitable for food and pharmaceutical applications while maintaining high productivity.
Solution Approach 2:
The patent uses a recombinant Bacillus sp. microorganism that can be cultured and harvested. The microbial cells and enzyme can be disposed of after use, eliminating the need for expensive and toxic chemical catalysts while maintaining rapid production capability.
3Productivity
If Helicobacter pylori strain is used for 2'-fucosyllactose synthesis, then production is possible, but consumer acceptance is reduced due to safety concerns
Solution Approach 1:
Instead of using the problematic Helicobacter pylori strain, the patent inverts the approach by using a safe, GRAS-recognized Bacillus sp. microorganism. This maintains the productivity of 2'-fucosyllactose synthesis while eliminating consumer safety concerns associated with pathogenic bacteria.
Solution Approach 2:
The patent uses a disposable recombinant Bacillus sp. strain that can be cultured, used for synthesis, and then discarded. This eliminates the need to maintain or handle pathogenic strains while achieving the same production goal with enhanced safety and consumer acceptance.
4Ease of operation
If xylose-inducible promoters are used, then gene expression can be controlled, but productivity is limited compared to constitutive promoters
Solution Approach 1:
The patent transitions from dynamic inducible expression (xylose-inducible) to constitutive expression, allowing continuous high-level production of α-1,2-fucosyl transferase without requiring inducer addition. This maintains operational simplicity while dramatically increasing productivity through constant enzyme availability.
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
The engineered Bacillus sp. microorganism significantly increases 2′-fucosyllactose productivity by up to 3.9 times compared to xylose-inducible promoters, providing a safer and more efficient method for industrial production.
Implementation Method 1
α-1,2-fucosyl transferase is a key enzyme that catalyzes the transfer of fucose to lactose to form 2'-fucosyllactose
Implementation Method 2
a regulatory sequence operably linked thereto
Data Source
AI summary
The present invention relates to a recombinant Bacillus sp. microorganism and a method for producing human milk oligosaccharides using the same.