Mutated AGAT Enzyme for High-Yield Guanidinoacetic Acid Production
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Solution Overview
Problem
Current methods for producing guanidinoacetic acid (GAA) are inefficient, environmentally unfriendly, and prone to contamination due to high temperature and pressure requirements, and the enzymatic production using L-arginine-glycine amidinotransferase (AGAT) faces low conversion rates and yield issues.
Innovation Solution
Screening and mutating L-arginine-glycine amidinotransferase (AGAT) from Amycolatopsis kentuckyensis to enhance enzyme activity, optimizing the enzyme's expression and reaction conditions, and using E. coli BL21 as a host with pET-28a plasmid to produce GAA.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If chemical synthesis method is used to produce GAA, then production efficiency is improved, but environmental friendliness deteriorates and product purity worsens
Solution Approach 1:
The patent replaces the chemical synthesis method with an enzymatic catalysis method using L-arginine-glycine amidinotransferase. This substitution eliminates the need for harsh chemical reagents (O-alkylisourea or cyanamide), high temperature and pressure conditions, and extensive purification steps, thereby improving environmental friendliness and product purity while maintaining production efficiency
Solution Approach 2:
The patent optimizes reaction parameters including temperature (30-50°C), pH (7.0-9.0), and substrate concentration ratios to enhance enzymatic activity. These parameter optimizations enable the enzymatic method to achieve high conversion rates (over 90%) and high yield (21.4 g/L), matching or exceeding chemical synthesis efficiency without the harmful side effects
2Object-affected harmful factors
If wild-type AGAT enzyme is used for enzymatic production, then environmental friendliness is improved, but production yield deteriorates
Solution Approach 1:
The patent performs site-directed mutagenesis on the AGAT enzyme, specifically mutating amino acid at position 225 to glutamine (Q225). This molecular-level parameter change significantly enhances the enzyme's catalytic activity and stability, enabling it to achieve high conversion rates (over 90%) and high yield (21.4 g/L), thereby resolving the contradiction between using a milder enzymatic method and achieving high productivity
Solution Approach 2:
The patent employs a feedback mechanism where the mutant enzyme's performance is continuously evaluated and optimized. The mutated enzyme shows improved resistance to product inhibition by L-ornithine and enhanced catalytic efficiency, which are then fed back into the production system to achieve sustained high yields
3Device complexity
If AGAT enzyme is expressed in microorganisms, then production method simplicity is improved, but enzyme solubility and activity deteriorate
Solution Approach 1:
The patent uses site-directed mutagenesis to modify the enzyme's amino acid sequence, specifically introducing mutations that enhance solubility and catalytic activity. The Q225 mutation and other optimized variants show significantly improved expression levels and enzyme activity in E. coli, resolving the contradiction between simple microbial expression and enzyme performance
Solution Approach 2:
The patent uses a plasmid vector system as an intermediary to express the mutated AGAT enzyme in E. coli. The plasmid carries optimized gene sequences that enable high-level expression of the soluble, active enzyme, facilitating simple microbial production while maintaining high enzyme quality
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 mutated AGAT enzyme significantly improves catalytic activity, achieving a 49.6% increase in GAA yield to 21.4 g/L, surpassing previous enzymatic production efficiencies.
Implementation Method 1
In the presence of L-arginine-glycine amidinotransferase (AGAT, EC:2.1.4.1) as a catalyst, guanidinoacetic acid and L-ornithine can be produced with L-arginine and glycine as substrates
Data Source
AI summary
The present invention discloses an L-arginine-glycine amidinotransferase and use thereof in the production of guanidinoacetic acid. In the present invention, through combined multi-site amino acid mutation, a technical effect of significantly improved enzyme activity of the mutant AkAGATT225Q/A258P/L278K than that of the wild-type strain is achieved, providing an application value for large-scale production of guanidinoacetic acid in industry. When the L-arginine-glycine amidinotransferase mutant constructed in the present invention is used in the production of guanidinoacetic acid, by optimizing the conversion conditions, the yield of guanidinoacetic acid is up to 21.4 g/L and the conversion rate is 90.4%, after 24 hrs of reaction in a 1 L reaction system. Compared with the production of guanidinoacetic acid with the raw enzyme, the yield is increased by 49.6%.