Constructing Cyclic Peptides Using an On-Tether Sulfonium Center

作者： Chunli Song*1, Zhanfeng Hou*1,2, Zijun Jiao*1, Zhaodi Liu3, Chenshan Lian1,2, Min Zhang1, Wei Liang3, Feng Yin1,2, Zigang Li1,2 1Pingshan Translational Medicine Center,Shenzhen Bay Laboratory, 2Key Laboratory of Chemical Genomics, School of Chemical Biology and Biotechnology,Peking University Shenzhen Graduate School, 3Department of Radiation Oncology, the First Affiliated Hospital,Anhui Medical University

简介：

Overview

This protocol presents the synthesis of cyclic peptides via bisalkylation between cysteine and methionine and the facile thiol-yne reaction triggered by the propargyl sulfonium center. The method is efficient and does not require a Met-catalyst, providing a straightforward approach to stabilizing peptides.

Key Study Components

Area of Science

• Neuroscience
• Biochemistry
• Peptide Synthesis

Background

• The sulfonium salt acts as a reactive species with cysteine.
• This technique offers a rapid and efficient reaction.
• It simplifies the stabilization of peptides.
• Utilizes a deprotection solution for resin preparation.

Purpose of Study

• To develop a new method for synthesizing cyclic peptides.
• To enhance the efficiency of peptide stabilization.
• To eliminate the need for a Met-catalyst in the process.

Methods Used

• Preparation of a deprotection solution using piperidine or morpholine.
• Sequential washing of resin with dichloromethane and DMF.
• Detection of resin color change using ninhydrin.
• Application of nitrogen bubbling to facilitate reactions.

Main Results

• The method successfully stabilizes cyclic peptides.
• Fast reaction times were achieved without a Met-catalyst.
• Resin showed a distinct color change indicating successful synthesis.
• The protocol is straightforward and efficient for researchers.

Conclusions

• This protocol provides a novel approach to cyclic peptide synthesis.
• It enhances the efficiency of peptide stabilization techniques.
• The method is accessible for researchers in the field.

Frequently Asked Questions