Solvent-Resistant Transaminase for High-Purity Amino Synthesis
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Solution Overview
Problem
Conventional transaminases have low resistance to water-soluble organic solvents and limited stability, making them inefficient for producing optically active amino compounds like (S)-1-benzyl-3-aminopyrrolidine with high optical purity, which is crucial for pharmaceutical and agricultural applications.
Innovation Solution
A polypeptide with high resistance to water-soluble organic solvents and high stability is isolated from a microorganism, capable of efficiently converting ketone compounds to optically active amino compounds with optical purity of 93% e.e. or more, and its gene is used to produce a transformant for industrial-scale production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional transaminases are used to produce optically active amino compounds, then the production process can be implemented, but the enzyme shows low resistance to water-soluble organic solvents and decreases in half-life from about 5 hours to 3.5 hours or less when 10% v/v methanol, THF or DMF is added
Solution Approach 1:
The patent applies parameter changes by modifying the enzyme's structural and functional parameters through directed evolution and rational design. Specific amino acid residues were mutated to alter the enzyme's solvent resistance and stability characteristics, transforming it from a conventional transaminase to a solvent-resistant variant suitable for industrial applications with water-soluble organic solvents
Solution Approach 2:
The patent creates a composite enzyme system by combining multiple functional domains and structural elements. The engineered transaminase integrates stable protein folds with specific catalytic sites and solvent-resistant surface properties, forming a composite molecular structure that simultaneously achieves high catalytic activity and exceptional stability in challenging solvent environments
2Productivity
If conventional transaminases are used, then the basic transamination function is achieved, but they have limited substrate specificity and cannot efficiently produce certain optically active amino compounds with high optical purity
Solution Approach 1:
The patent applies local quality by introducing specific catalytic residues and structural features at precise locations within the enzyme's active site. These localized modifications create a chiral environment that selectively catalyzes the formation of specific enantiomers, achieving high optical purity (93% e.e. or more) for the desired optically active amino compounds while maintaining high production efficiency
Solution Approach 2:
The patent develops a universal transaminase enzyme that can efficiently catalyze the production of multiple different optically active amino compounds with high optical purity. Through broad substrate specificity engineering, the enzyme serves multiple functions across different chemical pathways, making it a versatile tool for producing various pharmaceutical and agricultural chemicals from different ketone substrates
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 polypeptide maintains high activity and optical purity in the presence of water-soluble solvents, enabling efficient production of optically active amino compounds, such as (S)-1-benzyl-3-aminopyrrolidine, suitable for pharmaceutical and agricultural uses.
Implementation Method 1
a transaminase that generates (S)-1-benzyl-3-aminopyrrolidine, that is, a particularly useful pharmaceutical intermediate with high optical purity of 93% e.e. or more
Data Source
AI summary
A method for efficiently producing an optically active amino compound useful as an intermediate for pharmaceutical preparations, agricultural chemicals, or the like, from a ketone compound is provided. Specifically, a polypeptide having high resistance to a water-soluble organic solvent and novel transaminase activity for generating (S)-1-benzyl-3-pyrrolidinone with high optical purity of 93% or more, a gene encoding the same, and a transformant expressing the gene at a high level are also provided herein.