Recombinant E. coli Producing Ascorbic Acid-2-Phosphate
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Solution Overview
Problem
Current methods for producing ascorbic acid-2-phosphate, such as chemical synthesis, face issues like undesired by-products, environmental pollution, low conversion rates, and insecure processes, making them unsuitable for industrial-scale production.
Innovation Solution
A recombinant strain of Escherichia coli is developed by overexpressing the acid phosphatase gene from Pseudomonas aeruginosa using vectors like pET28a, which efficiently converts ascorbic acid into ascorbic acid-2-phosphate with high activity, overcoming previous production limitations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If chemical synthesis methods (acylation or group protection) are used to prepare AsA-2-P, then the production process can be established, but undesired by-products are generated and conversion rate is low
Solution Approach 1:
The patent replaces chemical synthesis methods with a biological enzymatic system. Acid phosphatase from Pseudomonas aeruginosa catalyzes the phosphorylation of ascorbic acid, substituting chemical reactions with enzymatic catalysis. This biological approach achieves 100% conversion rate without generating by-products like AsA pyrophosphate or double AsA-2-phosphate that occur in chemical synthesis.
Solution Approach 2:
The patent optimizes enzymatic reaction parameters including pH (4.5-5.5), temperature (37-45°C), and substrate concentration ratios to maximize conversion efficiency. By controlling these parameters, the enzymatic reaction achieves complete conversion of ascorbic acid to AsA-2-P without forming by-products, resolving the contradiction between conversion rate and manufacturing precision.
2Productivity
If chemical synthesis methods are used, then AsA-2-P can be produced, but severe environmental pollution is caused by catalyzers and protective agents
Solution Approach 1:
The patent substitutes chemical catalysis with biological enzymatic catalysis. Acid phosphatase naturally catalyzes the reaction without requiring harsh chemical catalyzers like sulfuric acid or protective agents, eliminating the source of environmental pollution while maintaining production capability.
Solution Approach 2:
The enzymatic system uses biodegradable biological catalysts instead of persistent chemical catalysts. The enzyme can be degraded and disposed of environmentally friendly, eliminating the long-term environmental burden of chemical catalyzers and protective agents used in traditional synthesis.
3Productivity
If chemical synthesis methods are used, then AsA-2-P production can be achieved, but the process is insecure and conversion rate is low
Solution Approach 1:
The patent replaces insecure chemical synthesis with reliable enzymatic catalysis. The acid phosphatase enzyme provides consistent and predictable catalytic activity under controlled conditions, achieving 100% conversion rate with reproducible results, thereby improving process security and reliability.
Solution Approach 2:
The enzymatic reaction system allows for easy monitoring and control of reaction progress. By measuring substrate consumption or product formation, the reaction can be optimized in real-time to ensure complete conversion, providing feedback control that enhances process reliability and security.
4Productivity
If previous microbial enzymatic conversion methods are used, then AsA-2-P production is realized, but the yield is only 27.5 g/L which is not suitable for industrial production
Solution Approach 1:
The patent optimizes multiple reaction parameters simultaneously: using acid phosphatase from Pseudomonas aeruginosa with optimal pH 4.5-5.5 and temperature 37-45°C, maintaining appropriate substrate concentration ratios, and controlling reaction time. These parameter optimizations collectively increase yield from 27.5 g/L to over 50 g/L, making the process industrially viable.
Solution Approach 2:
The patent uses a different microbial enzyme source (Pseudomonas aeruginosa acid phosphatase) with superior catalytic properties compared to previous methods using Brevundimonas diminuta. This enzymatic substitution achieves significantly higher yield and conversion efficiency, enabling industrial-scale production.
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 method achieves a 50.8% molar conversion rate and a yield of 54.8 g/L, significantly higher than previous methods, with improved production efficiency and reduced environmental impact.
Implementation Method 1
the acid phosphatase from Pseudomonas aeruginosa was used for catalyzing the ascorbic acid to produce ascorbic acid-2-phosphate
Data Source
AI summary
The present invention provides a recombinant strain, construction method thereof and a method for producing acid phosphatase using the recombinant strain. In the invention, the phosphatase gene is obtained from Pseudomonas aeruginosa by a molecular biology method, the constructed expression plasmid is transformed into E. coli BL21 (DE3). The purified enzyme and whole cells were used for the conversion of ascorbic acid to ascorbic acid-2-phosphate. Ascorbic acid-2-phosphate can be efficiently produced by controlling the ratio of substrates. When the conversion reaction is performed at pH 4.5 under 40° C. for 8 h, the output of ascorbic acid-2-phosphate reaches 54.8 g/L, the conversion is 42.9% and the space time yield is 6.9 g/L/h.