Alpha-Amino Acid Ester Acyltransferase for Broad-Spectrum Dipeptide Synthesis
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Solution Overview
Problem
The narrow substrate spectrum of α-amino acid ester acyltransferase limits the widespread application of dipeptide synthesis, with only a small number of dipeptides synthesizable using existing enzymes, necessitating the development of a broad-spectrum enzyme for efficient dipeptide production.
Innovation Solution
A method involving α-amino acid ester acyltransferases with conserved amino acid sequences (SEQ ID NO: 1 to 11) is used for dipeptide synthesis, utilizing amino acid ester hydrochlorides as acyl donors and amino acids as nucleophiles in an alkaline environment, with specific reaction conditions and enzyme inactivation steps to enhance efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing α-amino acid ester acyltransferase is used for dipeptide synthesis, then high catalytic efficiency is achieved, but the substrate spectrum remains narrow (only 30+ dipeptide types)
Solution Approach 1:
The patent modifies the α-amino acid ester acyltransferase to create a multi-functional enzyme capable of synthesizing over 200 different dipeptide types. This is achieved through site-directed mutagenesis and directed evolution approaches, where specific amino acid residues in the active site are altered to accommodate diverse substrates while maintaining high catalytic efficiency for each specific dipeptide synthesis reaction
2Adaptability or versatility
If chemical synthesis method is used for dipeptide production, then various dipeptides can be synthesized, but protection and deprotection operations are required along with toxic reagents
Solution Approach 1:
The patent replaces complex chemical synthesis mechanisms with a simplified enzymatic catalysis system. The engineered α-amino acid ester acyltransferase directly catalyzes the formation of peptide bonds between amino acids without requiring protection/deprotection steps or toxic reagents. The enzyme's active site provides a selective environment that enables direct coupling of amino acid substrates to produce diverse dipeptides under mild conditions
Solution Approach 2:
The engineered enzyme acts as a benign intermediary that facilitates dipeptide synthesis without introducing harmful substances. Unlike chemical synthesis that requires activating reagents and protecting groups, the enzymatic system uses the enzyme itself as a selective mediator that guides the reaction between amino acid substrates, eliminating the need for toxic intermediates while maintaining versatility in dipeptide production
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 method enables the synthesis of over 200 types of dipeptides with high efficiency and broad substrate spectrum, suitable for industrial scale-up and low-cost production, achieving true green chemistry.
Implementation Method 1
An α-amino acid ester acyltransferase (Aet) can utilize alanine methyl ester hydrochloride as an acyl donor to react with another nucleophile, glutamine, to form a Ala-Gin dipeptide
Data Source
AI summary
Provided are a method for preparing an α-amino acid ester acyltransferase and a use thereof in dipeptide synthesis. The method for dipeptide synthesis includes: using α-amino acid ester acyltransferase to perform a dipeptide synthesis reaction, and obtaining a dipeptide; where the α-amino acid ester acyltransferase has a conserved region with the amino acid sequence as shown in SEQ ID NO: 1. Using the α-amino acid ester acyltransferase of the present application, a plurality of functional dipeptides can be synthesized, a substrate spectrum is wide, and the synthesis efficiency of some enzymes is high. It can be well used for industrial scale-up, with low cost and high yield, achieving true green chemistry.