Engineered Corynebacterium Strains for High-Yield Allulose Production
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Solution Overview
Problem
Current methods for producing D-allulose, D-allose, and allitol are inefficient, with high production costs and low conversion rates, particularly due to the need for chemical synthesis and bioconversion processes that require multiple steps and expensive raw materials.
Innovation Solution
The development of engineered strains of bacteria, such as Corynebacterium glutamicum, that are genetically modified to enhance specific enzyme activities. These strains are used for fermentation to produce D-allulose and its derivatives, optimizing enzyme expression and activity to improve yield and reduce production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If chemical synthesis method is used to produce D-allulose, then product purity can be achieved, but production cost increases and productivity decreases due to multiple protection and deprotection steps
Solution Approach 1:
The patent replaces the complex chemical synthesis mechanism with a biological fermentation mechanism. Engineered microorganisms naturally catalyze the conversion of fructose to allulose through metabolic pathways, eliminating the need for multiple chemical protection and deprotection steps while maintaining product purity and significantly improving production efficiency
Solution Approach 2:
The engineered microorganisms perform self-catalysis through their endogenous metabolic systems. The bacteria naturally convert fructose to allulose through their metabolic enzymes without requiring external chemical catalysts or multiple processing steps, achieving both high purity and high efficiency
2Ease of manufacture
If bioconversion method using fructose and D-allulose 3-epimerase is used, then production cost is reduced, but conversion rate decreases and product separation becomes difficult
Solution Approach 1:
The patent changes the biochemical parameters of the microorganism by engineering enhanced expression of allulose 3-epimerase and optimizing metabolic flux through multiple gene modifications. This increases the enzymatic activity and conversion rate from the previously reported maximum of 32% to over 99%, while maintaining the cost advantages of biological production
Solution Approach 2:
The engineered metabolic pathway incorporates feedback mechanisms where the microorganism continuously converts fructose to allulose as long as substrate is available, with the pathway regulated to prevent accumulation of intermediate compounds and maximize final product yield, achieving near-complete conversion
3Quantity of substance
If allulose is used as substrate to produce allose through aldose-ketose isomerization, then allose can be obtained, but production cost increases due to high cost of allulose substrate
Solution Approach 1:
The patent performs preliminary action by engineering the microorganism to simultaneously produce both allulose and allose through a coupled metabolic pathway. The system first converts fructose to allulose, then automatically isomerizes allulose to allose within the same cellular system, eliminating the need to purchase expensive allulose as a separate substrate
Solution Approach 2:
The patent merges two separate production processes (allulose production and allose production) into a single integrated fermentation system. The engineered microorganism contains both the allulose 3-epimerase pathway and the aldose-ketose isomerization pathway, allowing simultaneous production of both products from a single substrate feed
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 engineered strains significantly increase the yield of D-allulose and its derivatives, achieving conversion rates of up to 99% and reducing production costs by simplifying the production process and eliminating the need for expensive raw materials.
Implementation Method 1
engineered strains of bacteria, such as Corynebacterium glutamicum, that are genetically modified to enhance specific enzyme activities. These strains are used for fermentation to produce D-allulose and its derivatives
Data Source
AI summary
Recombinant strains are obtained for the production of allulose, allose, and allitol by regulating intracellular glucose metabolism, reducing the enzyme activity of fructose 6-phosphate kinase, and enhancing the enzyme activities of glucokinase and glucose-6-phosphate isomerase, allulose 6-phosphate 3-epimerase, allulose 6-phosphate phosphatase, fructose permease and fructokinase, and optionally enhancing the enzyme activities of ribose 5-phosphate isomerase, allose 6-phosphate phosphatase, ribitol dehydrogenase, glycerol permease, glycerol dehydrogenase, and dihydroxyacetone kinase. A method for producing allulose and allose is an extracellular multienzyme cascade method. Multienzyme cascade catalysis and fermentation are coupled to improve the conversion rate of starch sugar or sucrose to the synthesized allulose.