Modified Aminotransferase Enhances Stereoselectivity and Stability
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Solution Overview
Problem
Current enzymes used for producing optically active amino compounds suffer from insufficient stereoselectivity and low stability under temperature and pH conditions suitable for substrate physical properties, limiting their industrial application.
Innovation Solution
A modified aminotransferase with enhanced activity, stereoselectivity, and stability is achieved by introducing specific mutations into the amino acid sequence of an aminotransferase derived from Pseudomonas fluorescens strain KNK08-18, specifically through substitutions at defined positions, allowing for efficient conversion of ketone compounds to optically active amino compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing aminotransferases are used for producing optically active amino compounds, then the production process can be implemented, but the stereoselectivity is insufficient and enzyme stability is low under suitable temperature and pH conditions
Solution Approach 1:
The patent applies parameter changes by modifying the amino acid sequence of the aminotransferase enzyme through site-directed mutagenesis. Specific amino acid residues at defined positions are substituted to alter the enzyme's catalytic properties, thereby improving both stereoselectivity and stability under optimized temperature and pH conditions for the substrate
2Productivity
If existing aminotransferases are used for producing optically active amino compounds, then the production process can be implemented, but the reactivity is low resulting in insufficient production efficiency
Solution Approach 1:
The patent improves enzyme reactivity and production efficiency by changing the amino acid sequence parameters of the aminotransferase. Through systematic substitution of amino acid residues at specific positions, the enzyme's catalytic activity is enhanced, leading to higher reactivity and improved productivity in the production of optically active amino compounds
3Productivity
If wild-type aminotransferase is used, then the natural enzyme function is maintained, but product-induced inhibition reduces the efficiency of the reaction
Solution Approach 1:
The patent addresses product-induced inhibition by changing the amino acid sequence parameters of the aminotransferase. Specific substitutions at defined positions modify the enzyme's interaction with the product, reducing inhibitory effects and thereby maintaining higher reaction efficiency throughout the process
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 modified aminotransferase demonstrates higher reactivity and stereoselectivity, reducing product-induced inhibition, enabling efficient production of optically active amino compounds suitable for pharmaceutical and agricultural applications.
Implementation Method 1
an enzyme capable of efficiently converting a ketone compound into an optically active amino compound via transamination
Data Source
AI summary
Provided is a method for efficiently producing from a ketone compound an optically active amino compound useful as an intermediate of a drug, an agricultural chemical, or the like. Provided are: a polypeptide having aminotransferase activity that is increased in stereoselectivity, heat resistance, and resistance to amine compounds compared to the wild type enzyme by means of modifying an aminotransferase derived from Pseudomonas fluorescens; a gene encoding the polypeptide; and a transformant that expresses the gene at a high level.