Modified Nitrilase Enzyme Activity Stability
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Solution Overview
Problem
Current nitrilases used for synthesizing carboxylic acids from nitriles have limitations in activity and temperature stability, which affect reaction efficiency and cost-effectiveness, as they require larger enzyme amounts and longer reaction times, especially at elevated temperatures.
Innovation Solution
Specific amino acid substitutions and combinations at positions L9, V63, T70, R94, F168, T208, C250, V305, and D308 in the nitrilase from Acidovorax facilis enhance both activity and temperature stability, allowing for reduced enzyme usage and faster reaction rates at higher temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wild-type nitrilase is used for carboxylic acid synthesis, then the process can be carried out with standard enzyme amounts, but the reaction requires longer time and higher enzyme quantities due to limited activity
Solution Approach 1:
The patent applies parameter changes by modifying the amino acid sequence of the nitrilase enzyme through site-directed mutagenesis. Specific amino acid residues at positions 9, 63, 70, 94, 168, 194, 208, 250, 305, and 308 are substituted to alter the enzyme's catalytic properties, thereby increasing reaction rate and reducing reaction time.
Solution Approach 2:
The patent creates improved enzyme variants by copying the wild-type nitrilase sequence and introducing specific mutations. The mutated genes are expressed in E. coli to produce enzyme variants that replicate the catalytic function with enhanced activity and stability properties.
2Temperature
If wild-type nitrilase is used, then the enzyme can be produced and used, but it exhibits insufficient temperature stability for effective high-temperature processing
Solution Approach 1:
The patent modifies the thermal stability parameter of the nitrilase by substituting specific amino acid residues. These mutations enhance the enzyme's structural stability at elevated temperatures, allowing the biocatalyst to maintain its activity and reliability under high-temperature processing conditions.
3Productivity
If larger amounts of enzyme are used to compensate for low activity, then sufficient conversion can be achieved, but the synthesis cost increases
Solution Approach 1:
The patent changes the catalytic efficiency parameter of the nitrilase through amino acid substitutions. The mutated enzyme variants exhibit higher specific activity, enabling sufficient conversion efficiency to be achieved with reduced enzyme quantities, thereby lowering synthesis costs.
4Productivity
If the enzyme is used at higher temperatures to accelerate reaction, then reaction time decreases, but the enzyme stability and lifespan are reduced
Solution Approach 1:
The patent modifies the thermal stability parameter of the nitrilase to enable the enzyme to withstand higher temperatures without denaturation. The amino acid substitutions enhance the enzyme's resistance to thermal inactivation, allowing high-temperature processing to accelerate reaction rates while preserving enzyme lifespan and activity.
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 nitrilases exhibit increased activity and stability, enabling shorter reaction times and lower enzyme requirements, thereby reducing synthesis costs and extending reaction lifespan, while maintaining high conversion efficiency.
Implementation Method 1
Nitrilases are used for the synthesis of carboxylic acids from the corresponding nitriles
Implementation Method 2
hydrolysis of nitriles to carboxylic acids
Data Source
AI summary
The invention relates to a nitrilase having improved activity in the reaction of a nitrile to form the corresponding carboxylic acid, in particular with respect to reacting 2-methylglutaronitrile, 1-(cyanomethyl)cyclohexane-1-carbonitrile, and benzonitrile. The nitrilase according to the invention is related to nitrilase from acidovorax facilis.