Mature Polypeptide Sequences for Scalable Lacto-N-Tetraose Synthesis
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Solution Overview
Problem
Current methods for producing human milk oligosaccharides (HMOs) face challenges such as high production costs, low yields, and environmental and safety risks, limiting their industrial-scale application in food products.
Innovation Solution
A mature polypeptide sequence with enhanced catalytic activity, derived from Aspergillus sp., Kluyveromyces sp., Bacillus sp., or Bifidobacterium sp., is modified at specific positions to optimize the synthesis of lacto-N-tetraose (LNT) using genetically engineered host cells, leveraging enzymatic reactions for efficient and scalable production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If chemical synthesis methods are used to produce HMOs, then structurally defined oligosaccharides can be produced, but the process becomes labor-intensive, has low yields, and presents food safety risks due to heavy metal usage
Solution Approach 1:
The patent replaces chemical synthesis methods with enzymatic biosynthesis methods. Specifically, it uses genetically modified microbial cells (E. coli, B. subtilis, K. lactis, A. oryzae) that express enzyme systems to catalyze the formation of HMOs from simple sugar precursors. This substitution eliminates heavy metal usage, reduces labor intensity, and improves yield while maintaining structural precision through enzymatic specificity.
Solution Approach 2:
The patent modifies the biosynthetic pathway parameters by introducing specific enzyme modifications and metabolic pathway adjustments in the host microorganisms. It optimizes conditions such as carbon source composition, temperature, pH, and aeration to enhance HMO production yield and efficiency, transforming the biosynthetic process into an industrial-scale operation.
2Manufacturing precision
If extraction methods are used to obtain HMOs from breast milk, then pure HMOs can be obtained, but the supply is limited and the process is not scalable for industrial production
Solution Approach 1:
The patent replaces physical extraction methods with microbial biosynthesis methods. Instead of extracting HMOs from limited breast milk supplies using complex extraction and purification procedures, the invention uses genetically engineered microorganisms to produce HMOs de novo from simple sugars, enabling unlimited scalable production while maintaining high purity through controlled fermentation processes.
Solution Approach 2:
The patent creates synthetic biological systems that copy the biosynthetic capabilities of human milk production. By introducing the necessary enzymatic pathways into microbial cells, the system replicates the biological function of HMO synthesis, allowing for large-scale production that mirrors natural production but operates at industrial capacity.
3Ease of manufacture
If existing enzymatic methods are used to synthesize LNT, then production costs can be reduced, but the catalytic activity is insufficient for large-scale industrial production
Solution Approach 1:
The patent applies local quality optimization by introducing specific amino acid mutations at critical positions in the enzyme molecules (e.g., positions 236, 460, 572, 608). These localized changes enhance the catalytic activity of specific enzymes in the biosynthetic pathway while maintaining the overall cost-effectiveness of the fermentation process. The mutations are strategically placed to improve substrate binding, transition state stabilization, or product release steps.
Solution Approach 2:
The patent optimizes enzymatic parameters by modifying enzyme expression levels, substrate concentrations, co-factor availability, and reaction conditions. It uses metabolic engineering to adjust flux through the biosynthetic pathway, ensuring that rate-limiting steps are optimized for maximum catalytic activity while maintaining economical production costs through efficient resource utilization.
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 modified polypeptide sequences exhibit high catalytic activity and thermal stability, enabling environmentally friendly and cost-effective large-scale production of LNT, suitable for dairy products, baked goods, and beverages.
Implementation Method 1
The present invention provides mature polypeptide sequences with high catalytic activity for synthesizing lacto-N-tetraose (LNT)... use the mature polypeptide as a catalyst to synthesize LNT
Implementation Method 2
the modified polypeptide sequences exhibit high catalytic activity... enabling environmentally friendly and cost-effective large-scale production of LNT
Implementation Method 3
The biological method is favored for its mild reaction conditions, easy product separation, short production cycle, high efficiency, environmental friendliness, low cost... LNT, which is produced via microbial fermentation
Data Source
AI summary
A mature polypeptide sequence the amino acid sequence of which has at least 60%, or at least 70%, or at least 75%, or at least 80%, or at least 85%, or at least 90%, or at least 95%, or at least 97%, or at least 98%, or at least 99%, or 100% sequence identity to at least one of the sequences selected from SEQ ID NO: 1, SEQ ID NO: 2, SEQ ID NO: 3, SEQ ID NO: 4, SEQ ID NO: 5, SEQ ID NO: 6, SEQ ID NO: 7, SEQ ID NO: 8, SEQ ID NO: 9, and SEQ ID NO: 10. The mature polypeptide sequence has a relatively high capability to catalyze synthesis of lactose-N-tetrasaccharide.