Corynebacterium PAPS Synthesis for Stable Sulfated Polysaccharides
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Solution Overview
Problem
Conventional methods for producing PAPS and sulfated polysaccharides, such as heparin and chondroitin sulfate, are costly due to the use of expensive raw materials like ATP and AMP, and require complex enzyme purification steps, making them unsuitable for industrial-scale production. Additionally, PAPS is unstable and prone to degradation by enzymes present in bacterial cells, complicating large-scale production.
Innovation Solution
A method utilizing recombinant DNA techniques to enhance ATP sulfurylase and APS kinase activities in Corynebacterium bacteria, combined with membrane permeability treatments, allows for PAPS production and sulfated polysaccharide synthesis using inexpensive materials like glucose and adenine, without enzyme purification, by incorporating transformants expressing sulfation enzymes into bacterial cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional methods use purified enzymes and expensive raw materials (ATP, AMP) for PAPS production, then product purity and activity are improved, but production cost increases and manufacturing complexity increases
Solution Approach 1:
The patent extracts and removes the problematic components (endogenous PAPS-degrading enzymes) from the bacterial system by creating mutant strains with deleted or inactivated cysQ and cysK genes, while retaining the beneficial metabolic pathways for PAPS production through introduction of exogenous ATP sulfurylase and APS kinase genes
Solution Approach 2:
The patent creates a multi-functional bacterial system that simultaneously performs ATP production, PAPS synthesis, and sulfated polysaccharide production. The Corynebacterium ammoniagenes strain serves multiple purposes: it produces ATP from inexpensive substrates, synthesizes PAPS through introduced enzymes, and supports sulfation reactions through its metabolic activities
2Productivity
If conventional methods use expensive raw materials like ATP and AMP, then PAPS production efficiency is improved, but production cost increases
Solution Approach 1:
The patent fundamentally changes the substrate parameters from expensive purified nucleotides (ATP, AMP) to inexpensive raw materials (glucose, adenine, sulfur compounds). The introduced enzyme system (ATP sulfurylase and APS kinase) enables efficient conversion of these simple substrates into PAPS, maintaining high productivity while dramatically reducing material costs
Solution Approach 2:
The bacterial system serves itself by producing ATP endogenously from inexpensive substrates through its metabolic pathways. The introduced ATP sulfurylase and APS kinase enzymes utilize this self-produced ATP along with sulfur sources to synthesize PAPS, eliminating the need for external ATP or AMP supplementation
3Ease of manufacture
If bacterial cells are used for PAPS production, then production cost decreases, but PAPS stability deteriorates due to endogenous degradation enzymes
Solution Approach 1:
The patent applies preliminary anti-action by deleting or inactivating the cysQ and cysK genes in Corynebacterium ammoniagenes before introducing the PAPS production pathway. This preemptive removal of degradation enzymes prevents PAPS breakdown, ensuring product stability while maintaining the cost advantages of using living bacterial cells
Solution Approach 2:
The patent converts the potentially harmful effect of endogenous PAPS degradation into a benefit by creating mutant strains where the degradation pathway is eliminated. The same bacterial system that originally posed a stability problem now becomes a stable, cost-effective production platform due to the selective removal of degradation enzymes
4Manufacturing precision
If enzyme purification steps are required, then product purity is improved, but manufacturing complexity and time increase
Solution Approach 1:
The patent merges the enzyme production and product synthesis steps by introducing the ATP sulfurylase and APS kinase genes directly into the bacterial genome. The bacteria themselves become the bioreactor that produces PAPS in situ, eliminating the need for separate enzyme extraction, purification, and application steps required in conventional methods
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 enables cost-effective and stable production of sulfated polysaccharides by leveraging metabolic activities of bacteria, eliminating the need for complex enzyme modifications and expensive raw materials, thus facilitating industrial-scale production.
Implementation Method 1
a method of using an ATP sulfurylase derived from purified yeast, an APS kinase derived from blue mold, and a pyrophosphatase derived from Escherichia coli
Implementation Method 2
an APS kinase derived from blue mold
Implementation Method 3
a pyrophosphatase derived from Escherichia coli
Implementation Method 4
a method for producing a sulfated polysaccharide using the bacterium of the genus Corynebacterium and a microorganism belonging to prokaryotes expressing various sulfation enzymes
Data Source
AI summary
The invention provides a method for producing a sulfated polysaccharide by generating a sulfated polysaccharide by incorporating, in a reaction solution in the presence of ATP or an ATP source, a sulfate ion source, and N-sulfoheparosan, a transformant (a) of a bacterium of the genus Corynebacterium, comprising at least a gene encoding an ATP sulfurylase and a gene encoding an APS kinase, and at least one selected from a transformant (b) of a microorganism belonging to prokaryotes, comprising at least a gene encoding a C5-epimerase, a transformant (c) of a microorganism belonging to prokaryotes, comprising at least a gene encoding a 2-O-sulfotransferase, a transformant (d) of a microorganism belonging to prokaryotes, comprising at least a gene encoding a 6-O-sulfotransferase, and a transformant (e) of a microorganism belonging to prokaryotes, comprising at least a gene encoding a 3-O-sulfotransferase.