Indole Grafted Solid Support for Fmoc Peptide Synthesis
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Solution Overview
Problem
Current methods for solid-phase peptide synthesis, particularly those using Boc/SPPS and Fmoc/SPPS, face challenges such as low peptide yield, racemization, and the inability to synthesize peptides with protected glutamic acid or aspartic acid, along with environmental concerns due to the use of hazardous reagents like hydrogen fluoride.
Innovation Solution
A solid support comprising a polymeric resin covalently conjugated to a linker, specifically designed for Fmoc-SPPS, which allows for high-yield and high-purity synthesis of peptides with C-terminus secondary amides, utilizing a two-step reaction scheme involving a linker moiety and reductive amination, and enabling direct release of peptides with mild acid treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Boc-SPPS is used for peptide synthesis, then peptides can be synthesized, but environmentally unfriendly reagents like hydrogen fluoride are required
Solution Approach 1:
The invention changes the chemical parameters of the solid support from Boc-compatible to Fmoc-compatible chemistry. The indole grafted solid support with secondary amine functionality enables Fmoc-SPPS, which uses environmentally benign reagents (piperidine, TFA) instead of hazardous HF, while maintaining peptide synthesis capability
Solution Approach 2:
The invention uses disposable Fmoc protecting groups and environmentally friendly reagents that can be easily removed and disposed of without causing environmental harm, replacing the reusable but hazardous HF system
2Reliability
If amine bound resins are used for Fmoc-SPPS synthesis of peptides with secondary amides, then synthesis can proceed, but expensive intermediates and multi-step reactions are required
Solution Approach 1:
The indole moiety is pre-grafted onto the solid support during support preparation, creating a ready-to-use platform that requires only single-step amino acid coupling. This preliminary structuring eliminates the need for expensive intermediates and multi-step reactions during actual peptide synthesis
Solution Approach 2:
The indole grafted solid support provides universal functionality for synthesizing various peptides with secondary amides, C-terminal amides, and other peptide structures using a single support type and straightforward coupling protocol, eliminating the need for different specialized resins
3Reliability
If direct method on alkylated amino methyl resin is used, then peptides with C-terminus secondary amides can be prepared, but peptide yield is relatively low after acidolysis
Solution Approach 1:
The invention changes the solid support chemistry from alkylated amino methyl resin to indole grafted resin with secondary amine functionality. This parameter change in support structure enables high-yield peptide release with mild acid treatment while maintaining the ability to synthesize C-terminus secondary amides
Solution Approach 2:
The indole moiety acts as an intermediary structure that facilitates both the attachment of amino acids and the high-yield release of peptides with C-terminal secondary amides. The secondary amine functionality serves as a mediating group that enables efficient peptide transfer to the support and subsequent high-yield cleavage
4Reliability
If indirect method on Merrifield resin is used, then peptides can be synthesized, but slow reaction times and racemization occur
Solution Approach 1:
The invention changes the solid support from Merrifield resin (chloromethylated polystyrene) to indole grafted resin with secondary amine functionality. This parameter change enables direct amino acid coupling without slow ester bond formation and minimizes racemization through the nucleophilic secondary amine mechanism
Data Source
AI summary
The present invention provides compositions and processes for the solid phase synthesis of polypeptides. In particular, the present invention provides solid supports and processes for preparing solid supports for the synthesis of polypeptides.