Protein and Peptide N-Terminal Modification via Selective Amide Bonding
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Solution Overview
Problem
Existing methods for linking molecules to the N-terminus of proteins and peptides are inefficient and lack selectivity, particularly for natural proteins, due to challenges in avoiding side reactions with other amino acid residues like lysine and difficulties in achieving selective modification based on pKa differences.
Innovation Solution
A compound represented by formula (1) or its salt, hydrate, or solvate is reacted with proteins and peptides to selectively link other molecules/substances to the N-terminus, utilizing specific organic and inorganic groups to facilitate selective bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If chemical bonding methods or lipid-modifying enzyme methods are used to introduce molecules specifically into the N-terminus, then N-terminal modification selectivity is improved, but device complexity and ease of manufacture deteriorate due to requiring special amino acid sequences or residues to be inserted
Solution Approach 1:
The invention changes the chemical parameters of the reaction system by using a carboxylic acid derivative with specific reactivity characteristics that preferentially reacts with the N-terminal amino group under controlled pH conditions, eliminating the need for special amino acid sequences while maintaining high selectivity
Solution Approach 2:
The carboxylic acid derivative acts as an intermediary reagent that mediates the selective coupling between the N-terminal amino group and the desired functional molecule, enabling specific N-terminal modification without requiring pre-engineered protein sequences
2Ease of operation
If amide bond formation reaction using activated ester or ketene is used, then ease of operation is improved, but N-terminal modification selectivity deteriorates due to side reactions with lysine residues
Solution Approach 1:
The invention optimizes reaction parameters by controlling pH and using a carboxylic acid derivative with controlled reactivity that maintains simplicity of operation while achieving high selectivity for N-terminal modification over lysine residues
Solution Approach 2:
The carboxylic acid derivative exhibits local reactivity preference for the N-terminal amino group due to its unique chemical environment and accessibility, enabling selective modification at this specific location while maintaining simple reaction conditions
3Manufacturing precision
If methods requiring special amino acid sequences or residues are used, then N-terminal modification selectivity is improved, but productivity deteriorates due to laborious protein preparation
Solution Approach 1:
The invention changes the reaction parameters to enable direct modification of natural proteins without sequence engineering, using a carboxylic acid derivative that provides high selectivity under physiological conditions, thereby improving both selectivity and productivity simultaneously
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
Enables simple and efficient linkage of molecules to the N-terminus of proteins and peptides, including natural ones, with reduced side reactions, enhancing selectivity and applicability.
Implementation Method 1
A compound represented by formula (1) or a salt thereof, or a hydrate or solvate of the compound or a salt thereof is reacted with a protein and/or peptide
Data Source
AI summary
An object of the present invention is to provide a technique that allows other molecules/substances to be more selectively linked to the N-terminus in a simple and efficient manner, even in natural proteins etc. This object is achieved by reacting a compound represented by formula (1) or a salt thereof, or a hydrate or solvate of the compound or a salt thereof with a protein and/or peptide.