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Yeast As a Chassis for Developing Functional Assays to Study Human P53
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Development of cell-penetrating peptide-based drug leads to inhibit MDMX:p53 and MDM2:p53 interactions

Grégoire Philippe1, Yen-Hua Huang1, Olivier Cheneval1

  • 1Institute for Molecular Bioscience, the University of Queensland, QLD, 4072, Australia.

Biopolymers
|June 12, 2016
PubMed

Insights

New peptide analogs targeting MDM2 and MDMX proteins show enhanced cellular activity against cancer cells. These inhibitors stabilize the p53 tumor suppressor pathway, offering a promising strategy for cancer therapy.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cancer Research

Background:

  • The p53 protein acts as a tumor suppressor by inducing apoptosis in damaged cells.
  • MDM2 and MDMX proteins inhibit p53 activity in healthy cells.
  • Cancer cells often overexpress MDM2/MDMX, inactivating p53 and promoting tumor growth.

Purpose of the Study:

  • To enhance the cellular inhibitory activity of a dual inhibitor peptide (pDI) targeting MDM2:p53 and MDMX:p53 interactions.
  • To develop constrained pDI analogs with improved stability and cancer cell penetration.

Main Methods:

  • Production of constrained pDI analogs with lactam staples for conformational stabilization.
  • Fusion of analogs with cell-penetrating peptides for enhanced cytosol delivery.
  • Comparison of pDI and analogs for inhibitory potency, cellular toxicity, and cancer cell entry.

Main Results:

  • pDI analogs maintained nanomolar affinity for MDM2 and MDMX.
  • Constrained analogs demonstrated high inhibitory activity against cancer cells.
  • Lactam staples and cell-penetrating peptides improved cellular efficacy.

Conclusions:

  • The developed pDI analogs are potent inhibitors of MDM2 and MDMX.
  • These analogs show significant anti-cancer activity by restoring p53 function.
  • The strategy of conformational stabilization and enhanced delivery is effective for peptide-based cancer therapeutics.
Keywords:
cell-penetrating peptidesinternalization mechanismp53 pathwaystapled peptides

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