Modified GH3.6 Enzyme for One-Step N-Acyl Amino Acid Synthesis
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Solution Overview
Problem
Existing methods for synthesizing N-acyl-amino group-containing compounds face challenges such as low production yields, environmental burdens, and complex reaction processes, making them unsuitable for industrial-scale production.
Innovation Solution
A modified indole-3-acetic acid-amido synthetase GH3.6 enzyme with specific amino acid mutations is used to enhance N-acylation activity, allowing efficient production of N-acyl-amino group-containing compounds through a single enzymatic reaction, suitable for industrial applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If chemical synthesis (Schotten-Baumann reaction) is used to produce N-acyl-amino group-containing compounds, then production efficiency is high, but environmental burden increases due to harmful by-products
Solution Approach 1:
The invention changes the chemical parameters of the reaction system by using enzymatic catalysis instead of chemical reagents. The modified GH3.6 enzyme catalyzes the N-acylation reaction between amino acids and fatty acids under mild conditions, producing water as the only by-product instead of harmful chemical waste, thus resolving the contradiction between productivity and environmental burden
Solution Approach 2:
The invention replaces the chemical synthesis mechanism with a biological enzymatic mechanism. The Schotten-Baumann reaction uses chemical reagents and produces harmful by-products, while the enzymatic synthesis uses the modified GH3.6 enzyme to catalyze the reaction, substituting chemical mechanics with biological mechanics to eliminate environmental harm while maintaining high productivity
2Reliability
If fermentation using Bacillus subtilis surfactin biosynthetic enzyme is used, then N-acyl-amino group-containing compounds are produced, but production amount is too low (116.8 mg/L) for industrial scale
Solution Approach 1:
The invention changes the enzyme's catalytic parameters through site-directed mutagenesis. By modifying specific amino acid residues in the GH3.6 enzyme, the catalytic efficiency and substrate binding affinity are enhanced, increasing the production amount from trace levels to industrially viable concentrations while maintaining the reliability of the fermentation process
Solution Approach 2:
The modified enzyme enables the fermentation system to self-optimize production. The enhanced N-acylation activity of the modified GH3.6 enzyme allows the bacterial system to efficiently convert substrates into N-acyl-amino group-containing compounds, achieving high production amounts through the enzyme's improved self-catalytic capability
3Reliability
If two-step enzymatic reaction using human-derived amino acid N-acyltransferase and E. coli-derived acyl-CoA synthase is used, then Nα-acylglycine is synthesized, but control complexity increases
Solution Approach 1:
The invention merges multiple enzymatic functions into a single modified GH3.6 enzyme. Instead of using two separate enzymes (amino acid N-acyltransferase and acyl-CoA synthase) that require coordinated control, the modified GH3.6 enzyme performs the N-acylation reaction in one step, eliminating the need for complex multi-enzyme system control while maintaining synthesis capability
Solution Approach 2:
The modified GH3.6 enzyme achieves multi-functionality by catalyzing the N-acylation reaction between amino acids and fatty acids directly. This single enzyme replaces the functionality of multiple specialized enzymes, providing universal N-acylation capability that simplifies the control system while maintaining reliable synthesis of N-acyl-amino group-containing compounds
4Reliability
If porcine kidney-derived acylase is used in glycerol-containing solution, then Nα-acylamino acid synthesis is achieved, but large amounts of glycerol are required and yield in aqueous solvent is low
Solution Approach 1:
The invention changes the reaction medium parameters and enzyme properties. The modified GH3.6 enzyme maintains high catalytic activity in aqueous solvents without requiring glycerol, unlike porcine kidney-derived acylase. By modifying the enzyme's structural parameters, it adapts to work efficiently in simple aqueous environments, increasing synthesis yield while eliminating the need for large amounts of glycerol
Solution Approach 2:
The invention replaces the expensive and complex glycerol-containing reaction system with a simple aqueous solvent system. The modified GH3.6 enzyme enables the reaction to proceed efficiently in water, which is cheap and readily available, eliminating the need for costly glycerol while maintaining high synthesis yield and simplifying the overall 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 enzyme improves N-acylation activity and substrate specificity, enabling high-yield production of N-acyl-amino compounds like Nα-lauroyl-L-glutamic acid, suitable for industrial surfactants.
Implementation Method 1
A modified indole-3-acetic acid-amido synthetase GH3.6 enzyme with specific amino acid mutations is used to enhance N-acylation activity, allowing efficient production of N-acyl-amino group-containing compounds through a single enzymatic reaction
Data Source
AI summary
The present invention provides an enzyme useful for establishing an excellent N-acyl-amino group-containing compound production system, and the like. More specifically, the present invention provides a modified enzyme comprising: (A) a modified amino acid sequence consisting of an amino acid sequence comprising mutations of one or more certain amino acid residues in an amino acid sequence of a wild type enzyme having an N-acylation activity; (B) an amino acid sequence comprising substitution, deletion, insertion, or addition of one or several additional amino acid residues in the modified amino acid sequence; or (C) an amino acid sequence comprising additional mutations of one or more amino acid residues in the modified amino acid sequence and having 90% or more identity to the modified amino acid sequence, having an N-acylation activity, and having an improved N-acylation activity to L-glutamic acid or L-aspartic acid or an improved substrate specificity to L-glutamic acid as compared with the wild type enzyme, and the like.