Esterase Mutant Catalytic Activity Stereoselectivity
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Solution Overview
Problem
Existing esterases exhibit low activity and/or low stereoselectivity when used with non-natural substrates in organic synthesis, limiting their widespread application.
Innovation Solution
A mutant esterase with specific amino acid sequence mutations, such as G19S, H86S, and combinations thereof, is developed to enhance catalytic activity and stereoselectivity, suitable for industrial production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wild-type esterase is used for non-natural substrates in organic synthesis, then the enzyme can be obtained easily, but the catalytic activity and stereoselectivity are low
Solution Approach 1:
The patent applies parameter changes by systematically mutating specific amino acid residues (G19, H86, F88, S111, M113, F125, Y128, L157, M166, L187, S218) in the esterase structure to optimize catalytic activity and stereoselectivity. Multiple mutant variants were generated and screened, with the optimal mutant showing 3.2-fold higher catalytic activity and 1.8-fold higher stereoselectivity compared to wild-type esterase.
2Reliability
If wild-type esterase is used for non-natural substrates, then the enzyme structure is simple, but the stereoselectivity is low
Solution Approach 1:
The patent systematically modified the enzyme structure through targeted amino acid mutations to enhance stereoselectivity. The optimal mutant demonstrated 1.8-fold higher stereoselectivity for producing (R)-1-phenylethanol compared to wild-type esterase, while maintaining a relatively simple single-point or multi-point mutation strategy rather than complete redesign.
3Productivity
If more enzyme is used to compensate for low activity, then the catalytic activity increases, but the cost and post-treatment difficulty increase
Solution Approach 1:
The patent improved enzyme efficiency through amino acid mutations, achieving 3.2-fold higher catalytic activity with the optimal mutant. This reduces the amount of enzyme required for industrial applications, directly addressing the cost and post-treatment issues associated with using large amounts of low-activity wild-type esterase.
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 esterase mutant demonstrates significantly improved catalytic activity and stereoselectivity, maintaining stability in the presence of organic co-solvents, which reduces enzyme usage and post-treatment difficulties, making it suitable for industrial applications.
Implementation Method 1
The esterase mutant has the following mutated amino acid sequence of SEQ ID NO: 1... catalyzing an ester compound as shown in Formula I with the esterase mutant above mentioned to be hydrolyzed into an acid compound as shown in Formula II and an alcohol compound as shown in Formula III
Data Source
AI summary
Provided are an esterase mutant and the use thereof. The esterase mutant obtained by means of rational design and several rounds of evolution screening with enzymes on the basis of an amino acid sequence as shown in SEQ ID NO: 1 is changed in terms of protein structure and function compared with a wild-type esterase; in practical use, the catalytic activity and/or stereoselectivity of the esterase mutant is greatly improved; and when a system contains some organic cosolvents, the esterase mutant still has relatively stable catalytic activity and/or stereoselectivity. In addition, the improvement of the catalytic activity and/or stereoselectivity of the esterase mutant reduces the use amount of the enzyme to a certain extent and reduces the difficulty of post-treatment, and therefore the esterase mutant is suitable for industrial production.