Candida antarctica Lipase B Mutant for Enantioselective Synthesis
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Solution Overview
Problem
Current methods for producing optically pure (R)-3-substituted glutaric acid monoesters, such as those used in pharmaceuticals, face challenges with low enantioselectivity and high production costs due to the requirement of low temperatures, which limits their industrial application.
Innovation Solution
A Candida antarctica lipase B mutant with specific amino acid substitutions (D223V, A281S, or D223V/A281S) is developed to enhance enantioselectivity and productivity at higher temperatures (20-55°C) through protein engineering and molecular dynamics simulations, allowing for high-yield production of (R)-3-t-butyl-dimethyl-silyloxy glutaric acid methyl monoester.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If low temperature is used to improve enantioselectivity, then enantioselectivity is improved, but productivity decreases and production cost increases
Solution Approach 1:
The patent applies parameter changes by modifying the temperature parameter from low temperature (typically -78°C to 5°C) to higher temperature (20-55°C) range. This is achieved through protein engineering of the lipase enzyme, specifically creating mutants with altered active site residues that enable high enantioselectivity (>99%) to be maintained at elevated temperatures, thereby resolving the contradiction between enantioselectivity and productivity
Solution Approach 2:
The patent creates copies of the wild-type lipase enzyme through directed mutagenesis, generating specific mutants (e.g., with D223V, A281S, or D223V/A281S substitutions) that replicate the high enantioselectivity trait while exhibiting improved temperature tolerance and catalytic activity at higher temperatures, thus achieving both high precision and productivity
2Manufacturing precision
If low temperature is used to improve enantioselectivity, then enantioselectivity is improved, but production cost increases
Solution Approach 1:
The patent changes the operational temperature parameter from cryogenic or near-ambient temperatures to moderate heating conditions (20-55°C). This parameter change enables the use of standard laboratory equipment instead of specialized low-temperature systems, reducing capital expenditure and operational costs while maintaining enantioselectivity above 99% through the engineered enzyme variants
3Device complexity
If wild type CALB is used, then simplicity is maintained, but enantioselectivity at high temperature deteriorates
Solution Approach 1:
The patent applies local quality by making targeted modifications at specific locations within the enzyme's active site. Instead of redesigning the entire enzyme structure, the invention introduces point mutations at critical residues (such as D223V, A281S) that locally alter the chemical environment of the active site, enabling high enantioselectivity at elevated temperatures while keeping the rest of the enzyme structure intact and simple
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 mutant lipase achieves high enantioselectivity (>99%) and increased reaction efficiency with reduced production costs, overcoming the limitations of the parent enzyme by maintaining high performance at elevated temperatures, thus enabling industrial-scale production.
Implementation Method 1
Candida antarctica Lipase B (CALB; EC 3.1.1.3), a member of α/β-hydrolase family, possesses the catalytic triad Ser105-Asp187-His224
Implementation Method 2
R, S-J6 may be prepared by using pig liver esterase and Novozym 435. α-Chymotrypsin is also employed in R-J6 preparation, which hydrolyzes the dialkyl-3-substituted glutaric acid
Data Source
AI summary
The present invention relates to the field of bioengineering. It provides a Candida antarctica lipase B mutant and its application. The mutant enzyme overcomes the limit of the parent enzyme that can exhibit high enantioselectivity towards (R)-3-TBDMSO glutaric acid methyl monoester only at temperatures below 5° C. The mutant enzyme successfully increased R-ee value at 5-70° C. The mutant D223V/A281S exhibits high R-ee value (>99%), high conversion rate (80%), and high space-time yield (107.54 g L−1 d−1). The present invention lays a foundation for industrial production of (R)-3-TBDMSO glutaric acid methyl monoester using a biosynthesis approach and provide insights into conformational dynamics-based enzyme design.