PEG-Modified Leaving Groups for Peptide Conjugation
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Solution Overview
Problem
Conventional protein and peptide conjugation methods often result in low yields and inefficient conjugation processes, particularly when using payloads without polyethylene glycol (PEG), and existing leaving groups in conjugating reagents do not provide optimal reaction conditions.
Innovation Solution
The use of conjugating reagents with leaving groups containing a defined number of repeating ethylene glycol units, specifically -(CH2CH2O)n, where n is six or more, which react with nucleophiles in proteins or peptides, enabling improved conjugation reactions and increased efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional conjugation reagents with traditional leaving groups are used, then the conjugation process can proceed, but the reaction yields are low and reaction times are long
Solution Approach 1:
The patent applies parameter changes by modifying the leaving group structure in conjugation reagents. Specifically, it uses leaving groups containing polyethylene glycol (PEG) chains with defined lengths (n=6 or more repeating units), which changes the physical and chemical parameters of the leaving group to achieve faster reaction kinetics and higher yields compared to conventional leaving groups.
Solution Approach 2:
The invention employs composite materials by combining PEG chains with traditional leaving group structures (such as sulfonates, carboxylates, or phosphates). This creates a hybrid leaving group that integrates the solubility and conformational flexibility benefits of PEG with the reactive departure capabilities of traditional leaving groups, resulting in improved conjugation efficiency.
2Productivity
If conventional leaving groups are used in conjugating reagents, then the reagents can function, but the conjugation efficiency is suboptimal particularly for non-PEG payloads
Solution Approach 1:
The patent implements universality by designing PEG-containing leaving groups that can effectively conjugate both PEG and non-PEG payloads. The PEG portion of the leaving group provides universal compatibility with various payload types, eliminating the need for payload-specific reagent optimization and simplifying the overall conjugation process.
Solution Approach 2:
The PEG chain in the leaving group acts as an intermediary element that mediates between the nucleophilic protein/peptide and the payload. It provides a flexible linkage that facilitates the conjugation reaction while maintaining solubility and reducing steric hindrance, thereby improving efficiency without adding significant process complexity.
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
This approach enhances the conjugation process by achieving higher yields and faster reaction times, particularly for payloads without PEG, leading to more efficient and effective protein-peptide conjugates.
Implementation Method 1
conjugating reagents with leaving groups containing a defined number of repeating ethylene glycol units, specifically -(CH2CH2O)n, where n is six or more, which react with nucleophiles in proteins or peptides
Data Source
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AI summary
The invention relates to novel conjugating reagents capable of reaction with at least one nucleophile present in a peptide or protein, which contain at least one leaving group which is lost on reaction with said nucleophile, in which the leaving group includes a portion -(CH2CH2O)n- in which n is a number of six or more; and novel processes for the preparation of conjugates containing peptides or proteins made using such reagents.