Single-Enzyme NMN Production via Hypoxanthine Phosphoribosyltransferase
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Solution Overview
Problem
Current methods for producing nicotinamide mononucleotide (NMN) require multiple enzymes and are either time-consuming, costly, or require large-scale equipment, with no known method using a single enzyme to produce NMN from nucleoside monophosphate, pyrophosphate, and nicotinamide.
Innovation Solution
A method utilizing a single enzyme, specifically hypoxanthine phosphoribosyltransferase (EC 2.4.2.8), to produce NMN by simultaneously converting nucleoside monophosphate and pyrophosphate into phosphoribosyl diphosphate and then nicotinamide into NMN, reducing the number of enzymes needed and simplifying the reaction process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple enzymes are used to produce NMN from nucleoside monophosphate, then the production pathway is well-established, but the device complexity and production cost increase
Solution Approach 1:
The patent combines the functions of HGPRT (which converts nucleoside monophosphate to PRPP) and NAMPT (which converts PRPP and nicotinamide to NMN) into a single enzymatic system. This merging eliminates the need for separate enzyme preparations, reaction steps, and purification processes, thereby reducing device complexity while maintaining production reliability through the use of a single well-characterized enzyme system
Solution Approach 2:
The invention demonstrates that a single enzyme system can perform multiple functions: first catalyzing the conversion of nucleoside monophosphate to phosphoribosyl diphosphate (PRPP), and then catalyzing the conversion of PRPP and nicotinamide to nicotinamide mononucleotide (NMN). This multi-functionality reduces the number of components needed in the production system while maintaining all necessary reaction pathways
2Manufacturing precision
If multiple sequential steps are used to produce NMN, then each reaction can be optimized independently, but the production time and process complexity increase
Solution Approach 1:
The patent merges two sequential reaction steps into a single simultaneous enzymatic process. The single enzyme system performs both the PRPP formation reaction and the NMN formation reaction concurrently in one reaction vessel, eliminating the time required for intermediate purification and setup between steps, while maintaining the ability to optimize reaction conditions for both transformations simultaneously
Solution Approach 2:
The invention enables continuous productive action by having the enzyme system perform both reactions without interruption or intermediate processing. The reaction proceeds continuously from substrates (nucleoside monophosphate and nicotinamide) to final product (NMN) through coupled enzymatic transformations, maximizing the utilization of reaction time and eliminating idle periods between sequential steps
3Manufacturing precision
If conventional enzymatic methods are used, then product quality can be maintained, but the productivity and cost-effectiveness decrease
Solution Approach 1:
The patent combines multiple enzymatic steps into a single reaction system that produces NMN directly from nucleoside monophosphate and nicotinamide. This consolidation reduces the number of purification steps required, minimizes product loss during processing, and accelerates overall production rate while maintaining high product quality through controlled enzymatic reactions in a single optimized reaction environment
Solution Approach 2:
The invention performs preliminary formation of phosphoribosyl diphosphate (PRPP) within the same reaction system where nicotinamide is converted to NMN, rather than requiring separate preliminary preparation and purification of PRPP. This preliminary action integrated into the main reaction pathway eliminates intermediate handling steps and accelerates overall productivity while maintaining product quality through continuous controlled transformation
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
This approach enhances productivity, reduces costs, and simplifies the production process by using a single enzyme to produce NMN efficiently, improving product quality and operational efficiency.
Implementation Method 1
a first step of producing phosphoribosyl diphosphate by the action of substantially one enzyme on nucleoside monophosphate and pyrophosphate
Implementation Method 2
a second step of producing nicotinamide mononucleotide by the action of only substantially the aforementioned one enzyme on nicotinamide and the phosphoribosyl diphosphate
Data Source
AI summary
The present invention addresses the problem of providing a method for producing nicotinamide mononucleotide, that produces nicotinamide mononucleotide using a single enzyme and using nucleoside monophosphate, pyrophosphate, and nicotinamide as starting materials. This problem is solved by a nicotinamide mononucleotide production method that includes at least the following steps 1) and 2): 1) a first step of producing phosphoribosyl diphosphate by the action of substantially one enzyme on nucleoside monophosphate and pyrophosphate; and 2) a second step of producing nicotinamide mononucleotide by the action of only substantially the aforementioned one enzyme on nicotinamide and the phosphoribosyl diphosphate that is the product of the first step.