Novel Psicose Epimerase for High-Temperature Fructose Conversion
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Solution Overview
Problem
Current methods for producing D-psicose, a low-calorie sweetener, face challenges such as high production costs and low efficiency due to enzyme instability and reaction rate issues at high temperatures and alkaline pH conditions, making them unsuitable for industrialization.
Innovation Solution
A novel D-psicose 3-epimerase derived from Flavonifractor plautii with optimal activity at neutral to weak acid pH and high temperatures, allowing for efficient conversion of fructose to D-psicose, is developed, along with a method for producing this enzyme using recombinant strains and specific DNA sequences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing psicose epimerases are used for industrial production, then psicose can be produced from fructose, but the enzyme stability and reaction rate deteriorate at high temperatures and alkaline pH conditions
Solution Approach 1:
The patent applies parameter changes by optimizing the enzyme's operational conditions - specifically operating at neutral pH (6.5-7.5) and moderate temperatures (40-60°C) where the novel epimerase maintains high stability and activity. This resolves the contradiction by finding optimal parameter ranges that preserve enzyme reliability while achieving productive conversion rates.
Solution Approach 2:
The patent uses genetic copying by cloning the novel psicose epimerase gene into expression vectors and transforming host cells to produce large quantities of the enzyme. This allows the enzyme to be mass-produced and applied industrially, resolving the contradiction between production efficiency and enzyme stability through规模化 production and application.
2Productivity
If chemical production methods are used for psicose, then psicose can be produced, but production costs increase and byproducts are generated
Solution Approach 1:
The patent replaces chemical production methods with a biological enzymatic system. The novel psicose epimerase catalyzes the conversion of fructose to psicose under mild conditions, eliminating the need for harsh chemical reagents, high energy input, and complex purification steps. This substitution resolves the contradiction by achieving productive psicose synthesis without generating harmful byproducts or incurring high costs.
Solution Approach 2:
The patent introduces an enzymatic intermediary - the novel psicose epimerase - that mediates the conversion of fructose to psicose. This biological catalyst provides a selective and efficient pathway that avoids the non-specific reactions and harmful byproducts associated with chemical methods, resolving the contradiction between production capability and harmful factor generation.
3Productivity
If existing psicose epimerases operate at alkaline pH, then conversion activity is maintained, but non-specific reactions and browning of sugar occur
Solution Approach 1:
The patent applies parameter changes by shifting the operational pH from alkaline to neutral (6.5-7.5), where the novel epimerase exhibits both high catalytic activity and high specificity. This parameter optimization resolves the contradiction by maintaining productive conversion while eliminating the harmful browning and non-specific reactions that occur at alkaline pH.
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 novel enzyme exhibits excellent thermal stability and high activity, enabling mass production of D-psicose at neutral pH and high temperatures, thus overcoming previous industrialization limitations and enhancing production efficiency.
Implementation Method 1
a method of producing psicose from fructose by using a psicose epimerase
Data Source
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AI summary
The present invention provides a novel psicose epimerase derived from Flavonifractor plautii and capable of converting fructose to psicose. The novel psicose epimerase according to the present invention possesses an activity producing psicose by epimerizing the carbon-3 position of fructose, and has maximal activity for the conversion of fructose to psicose at a relatively high temperature and a pH less than or equal to neutral, has excellent thermal stability, and can mass-produce psicose from fructose in a high yield for a short amount of time. Therefore, the psicose epimerase according to the present invention is advantageous in the industrial production of psicose, and it is expected that the psicose produced thereby can be usefully utilized in the functional sugar industry and also as materials for health food, medicine, cosmetics, and the like using the psicose.