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Small-molecule antagonists of Myc/Max dimerization inhibit Myc-induced transformation of chicken embryo fibroblasts

Thorsten Berg1, Steven B Cohen, Joel Desharnais

  • 1Department of Molecular and Experimental Medicine, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.

Proceedings of the National Academy of Sciences of the United States of America
|March 14, 2002
PubMed

Insights

Researchers identified small molecules that inhibit Myc/Max dimerization, a key step in cancer development. These inhibitors show potential for controlling Myc

Area of Science:

  • Oncology
  • Molecular Biology
  • Drug Discovery

Background:

  • Myc is a potent oncogenic transcriptional regulator from the basic helix-loop-helix leucine zipper protein family.
  • Myc's oncogenic activity requires dimerization with the Max protein.
  • Deregulated Myc expression is linked to various human cancers, highlighting its role in tumorigenesis.

Purpose of the Study:

  • To identify small molecules that inhibit Myc/Max dimerization.
  • To explore the potential of targeting protein-protein interactions for cancer therapy.

Main Methods:

  • Utilized fluorescence resonance energy transfer (FRET) to measure Myc/Max dimerization.
  • Screened combinatorial chemical libraries, specifically a peptidomimetics library, for dimerization inhibitors.
  • Validated inhibitor efficacy using ELISA and electrophoretic mobility-shift assays.

Main Results:

  • Identified candidate small molecule inhibitors of Myc/Max dimerization from a peptidomimetics library.
  • Confirmed inhibition of Myc/Max interaction through biochemical assays.
  • Demonstrated that two identified inhibitors reduce Myc-induced oncogenic transformation in cell cultures.

Conclusions:

  • Provides proof of principle for using high-throughput screening of chemical libraries to find inhibitors of protein-protein interactions.
  • Highlights the potential of targeting Myc/Max dimerization as a therapeutic strategy for Myc-driven cancers.

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