Novel D-serine Synthase Enzyme for High-Yield Production
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Solution Overview
Problem
Current methods for synthesizing D-serine from formaldehyde and glycine using D-threonine aldolase (DTA) result in low yields and produce L-serine as a byproduct, which complicates purification and reduces efficiency.
Innovation Solution
Identification and utilization of a novel enzyme encoded by DNA from microorganisms like Achromobacter, integrated into a recombinant vector and expressed in Escherichia coli, which achieves high yield D-serine production with minimal L-serine formation through optimized conditions such as organic solvent treatment, heat treatment, and divalent metal ions, or using a microorganism lacking L-serine synthase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If D-threonine aldolase (DTA) is used to synthesize D-serine from formaldehyde and glycine, then the reaction can proceed, but the yield is low (5%) and L-serine is produced as a byproduct
Solution Approach 1:
The patent extracts and utilizes a specific functional domain (aldolase domain) from the native enzyme system, separating the desired D-serine synthesis function from the side reaction that produces L-serine. By expressing the aldolase domain as a standalone recombinant protein in E. coli, the system achieves selective D-serine production without the contaminating L-serine byproduct that occurs with native DTA
Solution Approach 2:
The patent changes the biochemical parameters of the reaction system by using engineered E. coli strains with modified metabolic pathways. Specifically, strains lacking serine hydroxymethyltransferase activity and overexpressing D-serine deaminase are used to prevent L-serine formation and enhance D-serine production, respectively, thereby improving both yield and purity
2Ease of manufacture
If conventional DTA methods are used, then the process is simple, but extensive purification is required due to L-serine impurity
Solution Approach 1:
The patent extracts the aldolase catalytic function from complex native enzyme systems and implements it as a recombinant protein expression system in E. coli. This extraction approach simplifies the manufacturing process by eliminating the need for complex purification steps while maintaining high D-serine yield and purity
Solution Approach 2:
The engineered E. coli strain performs self-purification by lacking the metabolic pathway to produce L-serine (through deletion of serine hydroxymethyltransferase) and by actively converting any L-serine that forms back to D-serine (through overexpression of D-serine deaminase). This self-service mechanism eliminates the need for external purification interventions
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 D-serine yield of 70% or more with reduced L-serine impurity, improving the efficiency and purity of D-serine production.
Implementation Method 1
DNA encoding a novel enzyme having activity of synthesizing D-serine from formaldehyde and glycine
Implementation Method 2
optimized conditions such as organic solvent treatment, heat treatment, and divalent metal ions
Data Source
AI summary
This invention relates to DNA encoding a novel enzyme having activity of synthesizing D-serine from formaldehyde and glycine, recombinant DNA constructed by integrating such DNA into a vector, a transformant transformed with the recombinant DNA, and a method for producing D-serine from formaldehyde and glycine with the use of the enzyme.