APS Regeneration Cycle for Lower-Cost Sulfonation Synthesis
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Solution Overview
Problem
The complex preparation process and high cost of PAPS restrict industrial sulfonic acid substance production, and PNP byproducts are toxic, making it unsuitable for food and medicine production.
Innovation Solution
A method for regenerating adenosine-5′-phosphosulfate (APS) using AMP, ADP, or ATP as substrates with sulfotransferase, polyphosphate kinase, and ATP sulfurylase, forming a closed-loop cyclic catalytic reaction system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If PAPS is used as the active sulfonate donor, then sulfonation reactions can proceed, but the preparation process becomes complex and costs increase
Solution Approach 1:
The invention extracts the essential function of PAPS (sulfonate donation) and transfers it to APS, removing the complex two-step activation system (ATPS + APSK) and retaining only the ATP sulfurylase step. This extraction simplifies the synthesis pathway while preserving the core sulfonation capability.
Solution Approach 2:
Instead of following the conventional PAPS synthesis route (ATP → APS → PAPS), the invention inverts the approach by directly using ATP to generate APS through ATP sulfurylase, bypassing the intermediate APS kinase step entirely. This inversion fundamentally simplifies the pathway.
2Reliability
If PAPS regeneration cycle uses phenol sulfotransferase, then PAPS can be regenerated, but toxic PNP byproduct is generated
Solution Approach 1:
The invention converts the potentially harmful PNP byproduct pathway into a beneficial route by using pyrophosphatase to hydrolyze PPi into harmless phosphate. This transforms a toxic waste problem into an environmentally friendly regeneration process suitable for food and pharmaceutical applications.
Solution Approach 2:
The invention introduces pyrophosphatase as an intermediary enzyme that mediates the conversion of PPi to phosphate, creating a safe intermediate step that eliminates toxicity. This intermediary enzyme bridges the gap between sulfonation reaction and safe waste disposal.
3Productivity
If PAPS is used for industrial production, then sulfonation can be achieved, but production cost increases
Solution Approach 1:
The invention replaces expensive PAPS with a more economical APS system that uses readily available ATP and inorganic phosphate as substrates. The simplified pathway reduces material costs and eliminates the need for expensive enzyme combinations, making industrial production more economically viable.
4Device complexity
If APS is used as sulfonate donor, then reaction steps are reduced, but regeneration system must be constructed
Solution Approach 1:
The invention makes ATP serve multiple functions: it acts as both the energy source for sulfurylase and the phosphate donor for regenerating APS from AMP. This multi-functionality of ATP simplifies the regeneration system by eliminating the need for separate expensive substrates or complex enzyme systems.
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
Simplifies sulfonation modification synthesis, reduces costs, and improves efficiency by utilizing APS as a universal sulfonate donor, achieving high yields of sulfonation products like heparin and chondroitin sulfate.
Implementation Method 1
ATP sulfurylase (ATPS, EC 2.7.7.4)
Implementation Method 2
catalyzing ATP and sulfate ions by an ATP sulfurylase (ATPS, EC 2.7.7.4), and pyrophosphate (PPi) as a byproduct is generated
Implementation Method 3
a pyrophosphatase also participates in the method
Implementation Method 4
pyrophosphatase also participates in the method
Implementation Method 5
polyphosphate kinase, and an ATP sulfurylase
Implementation Method 6
AMP, ADP, or ATP as substrates with sulfotransferase, polyphosphate kinase
Data Source
AI summary
Disclosed is a method for constructing a synthesis and regeneration system based on APS as an active sulfonate donor, belonging to the technical field of biology. The present disclosure provides a new purpose of APS as an active sulfonate donor, and greatly improves the synthesis efficiency of the APS by screening different ATP sulfurylases and adding a pyrophosphatase into a reaction system to eliminate pyrophosphate as a byproduct. Further, the construction of a sulfonation modification system is realized by constructing an APS circulation regeneration system. Compared with a PAPS regeneration system, the APS circulation regeneration system has the advantages of short path and high efficiency, the sulfonation modification efficiency is significantly improved, and the synthesis cost is successfully reduced.