Recombinant Pseudomonas plecoglossicida for L-xylose Production
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Solution Overview
Problem
Current methods for producing L-xylose, such as acid hydrolysis, result in environmental pollution, high production costs, and low post-treatment efficiency due to the use of sulfuric acid and the presence of impurities, while chemical synthesis methods are costly and inefficient.
Innovation Solution
A recombinant Pseudomonas plecoglossicida strain is engineered using a double plasmid expression system to express specific genes, allowing it to directly convert glucose into L-xylose, thereby simplifying the production process and reducing environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If acid hydrolysis method is used to produce L-xylose, then L-xylose can be obtained from raw materials, but a large amount of sulfuric acid is consumed and by-products are produced affecting product quality
Solution Approach 1:
The patent replaces the chemical acid hydrolysis system with a biological fermentation system using recombinant Pseudomonas plecoglossicida. The bacterium metabolically converts glucose to L-xylose through engineered enzymatic pathways, eliminating the need for sulfuric acid and its associated harmful by-products while maintaining production efficiency.
Solution Approach 2:
The patent changes the fundamental production parameter from chemical hydrolysis to biological fermentation. By introducing recombinant bacteria with modified metabolic pathways, the process transforms glucose directly into L-xylose through cellular metabolism, fundamentally altering the chemical parameters and eliminating acid consumption.
2Productivity
If acid hydrolysis method is used to produce L-xylose, then L-xylose can be extracted from raw materials, but a large amount of production waste liquid is produced causing environmental pollution
Solution Approach 1:
The patent substitutes the polluting acid hydrolysis process with a clean biological fermentation process. The recombinant bacteria perform the conversion internally and secrete L-xylose into the culture medium, eliminating the generation of large volumes of acidic waste liquid that causes environmental pollution.
Solution Approach 2:
The patent converts the harmful acid hydrolysis process into a beneficial biological process where the bacteria's metabolic activity, which would normally consume energy and resources, is redirected to produce L-xylose as a valuable product without generating harmful waste.
3Productivity
If acid hydrolysis method is used to produce L-xylose, then L-xylose can be obtained from raw materials, but post-treatment efficiency is low and many chemical processes are needed
Solution Approach 1:
The patent performs the conversion action preliminarily within the bacterial cells during fermentation. The recombinant bacteria pre-process the glucose substrate through their metabolic pathways and directly produce L-xylose in the culture medium, eliminating the need for subsequent complex chemical treatment steps required in acid hydrolysis.
Solution Approach 2:
The patent extracts only the essential conversion function from the complex acid hydrolysis process by using genetically engineered bacteria to perform the glucose-to-L-xylose conversion internally, then simply harvesting the product from the culture medium through straightforward filtration and concentration steps.
4Productivity
If chemical synthesis method is used to produce L-xylose, then L-xylose can be produced, but the production cost is high and efficiency is low
Solution Approach 1:
The patent enables the bacterial system to perform the synthesis work itself through its own metabolic machinery. The recombinant Pseudomonas plecoglossicida uses its endogenous enzymes and cofactors to convert glucose to L-xylose autonomously, eliminating the need for expensive chemical reagents, catalysts, and energy-intensive processing required in chemical synthesis.
Solution Approach 2:
The patent changes the production parameters from high-cost chemical synthesis conditions to low-cost biological fermentation conditions. The process operates under mild physiological conditions with inexpensive glucose as substrate, dramatically reducing production costs and improving efficiency compared to chemical 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
The method achieves high product quality with minimal environmental pollution, achieving yields of up to 45.8 g/L of L-xylose and a glucose transformation rate of 57.3%, providing a foundation for green industrial production.
Implementation Method 1
P. plecoglossicida is used as a host, and a double plasmid expression system is utilized to express a 2-ketogluconate dehydrogenase gene, 2,5-diketogluconate reductase gene and a pyruvate decarboxylase gene
Data Source
AI summary
The disclosure discloses recombinant Pseudomonas plecoglossicida for producing L-xylose and application thereof, and belongs to the technical field of bioengineering. According to the disclosure, a synthesized 2-ketogluconate reductase gene and a 2,5-diketogluconate reductase gene derived from Corynebaterium ATCC 31090 and a pyruvate decarboxylase gene derived from Saccharomyces cerevisiae are successfully expressed in a host P. plecoglossicida by a double plasmid system, and an obtained genetically engineered strain is fermented for 56 h in a shake flask, where the yield of L-xylose reaches 16.2 g/L, and the transformation rate reaches 20.3%; the obtained genetically engineered strain is fermented for 48 h and 44 h in 3 L and 15 L fermentors, respectively, where the yields of L-xylose reach 37.6 g/L and 45.8 g/L, respectively, and the glucose transformation rates are 47.0% and 57.3%, respectively. The method has the advantages of low raw material cost, no pollution to the environment, simple operation, and important economic and social benefits.