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Constructing Head-to-Tail Cyclic Peptide DNA-Encoded Libraries Using Two-Directional Synthesis Strategy.

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Researchers developed a new two-directional synthesis strategy for creating DNA-encoded macrocyclic peptides. This method simplifies the process for generating cyclic peptides of varying sizes for drug discovery.

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Area of Science:

  • Medicinal Chemistry
  • Chemical Biology
  • Drug Discovery

Background:

  • Macrocyclic peptides are crucial therapeutic agents for challenging biological targets.
  • DNA-encoded library technology (DELT) is a powerful tool for identifying drug leads.
  • Combining macrocyclic peptides and DELT has successfully identified cyclic peptide hits.

Purpose of the Study:

  • To address the synthetic challenges in constructing head-to-tail macrocyclic DNA-encoded libraries.
  • To develop a streamlined method for producing macrocyclic peptides with diverse ring sizes.
  • To overcome limitations in macrocyclization due to precursor conformation and DNA linkage.

Main Methods:

  • A novel two-directional synthesis strategy was employed.
  • The method utilizes a trifunctional reagent as a starting material.
  • Amide bond formation was used to create macrocyclic peptides with ring sizes from 15 to 24 (5-mer to 8-mer).

Main Results:

  • Successfully prepared DNA-linked macrocyclic peptides with ring sizes ranging from 15 to 24.
  • The two-directional approach simplifies the synthetic workflow for macrocyclization.
  • Demonstrated the versatility of the method for generating diverse cyclic peptide libraries.

Conclusions:

  • The reported two-directional synthesis strategy offers an efficient approach for constructing macrocyclic peptides.
  • This method streamlines the production of DNA-encoded macrocyclic libraries for drug discovery.
  • The strategy facilitates the generation of cyclic peptides with tunable ring sizes for targeting difficult biological entities.