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Development of a Backbone Cyclic Peptide Library as Potential Antiparasitic Therapeutics Using Microwave Irradiation
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MYC-Targeting Inhibitors Generated from a Stereodiversified Bicyclic Peptide Library.

Zhonghan Li1, Yi Huang1, Ta I Hung1

  • 1Department of Chemistry, University of California, Riverside, Riverside, California 92521, United States.

Journal of the American Chemical Society
|January 3, 2024
PubMed
Summary
This summary is machine-generated.

We developed a new bicyclic peptide library (NTB) using a novel ring-opening/closing metathesis reaction. This library successfully identified MYC-targeting peptides, with NT-B2R inhibiting MYC transcription and cell growth.

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Area of Science:

  • Medicinal Chemistry
  • Organic Chemistry
  • Molecular Biology

Background:

  • Macrocyclic peptides offer therapeutic potential but face challenges in synthesis and screening.
  • Developing efficient methods for constructing and analyzing peptide libraries is crucial for drug discovery.
  • Targeting oncoproteins like MYC is a key strategy in cancer therapy.

Purpose of the Study:

  • To introduce the second generation of the bicyclic peptide library (NTB) with improved design and synthesis.
  • To apply the NTB library for the identification of novel MYC-targeting agents.
  • To evaluate the therapeutic potential of identified MYC-targeting bicyclic peptides.

Main Methods:

  • Utilized a tandem ring-opening metathesis and ring-closing metathesis (ROM-RCM) reaction for one-step cyclization of linear peptides.
  • Developed a facile one-step deallylation process for MS/MS sequencing of bicyclic peptides.
  • Screened the NTB library against the E363-R378 epitope of MYC and performed in vitro cell studies.

Main Results:

  • Successfully synthesized a stereodiversified bicyclic peptide library using an efficient ROM-RCM strategy.
  • Identified several bicyclic peptides that target MYC.
  • Demonstrated that the candidate NT-B2R effectively suppressed MYC transcription and cell proliferation in vitro.

Conclusions:

  • The NTB library provides a powerful and versatile platform for the discovery of macrocyclic peptide therapeutics.
  • The developed ROM-RCM approach represents a significant advancement in macrocyclic peptide synthesis.
  • NT-B2R shows promise as a potential therapeutic agent for MYC-driven cancers.