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Peptides Targeting the IF1-ATP Synthase Complex Modulate the Permeability Transition Pore in Cancer HeLa Cells.

Martina Grandi1, Simone Fabbian2, Giancarlo Solaini1

  • 1Department of Biomedical and Neuromotor Sciences, University of Bologna, 40126 Bologna, Italy.

International Journal of Molecular Sciences
|May 11, 2024
PubMed
Summary

Mitochondrial protein IF1 promotes cancer by inhibiting apoptosis. Researchers developed peptides targeting the IF1-OSCP interaction, showing potential for new anti-cancer therapies by disrupting this pro-oncogenic pathway.

Keywords:
ATP synthasecancerinhibitor protein IF1mitochondriapermeability transition poretherapy

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Oncology

Background:

  • The mitochondrial protein IF1 is upregulated in numerous tumors.
  • IF1 acts as a pro-oncogenic protein by interacting with ATP synthase and inhibiting apoptosis.
  • The precise molecular nature of the IF1-Oligomycin Sensitivity Conferring Protein (OSCP) interaction and its therapeutic potential are under investigation.

Purpose of the Study:

  • To investigate the IF1-OSCP interaction as a potential target for novel anti-cancer therapeutic interventions.
  • To generate and characterize mitochondria-targeting peptides designed to displace IF1 from OSCP.

Main Methods:

  • Generation of mitochondria-targeting peptides.
  • Immunoprecipitation to confirm IF1 displacement from ATP synthase.
  • Nuclear Magnetic Resonance (NMR) spectroscopy to identify peptides binding to OSCP.
  • In situ treatment of HeLa cells with peptide derivatives.

Main Results:

  • A selective peptide successfully displaced IF1 from ATP synthase.
  • NMR identified a peptide with affinity for the OSCP N-terminal region, overlapping the IF1 binding site.
  • Peptide treatment in IF1-silenced HeLa cells inhibited mitochondrial permeability transition without affecting respiration.
  • A third peptide counteracted the anti-apoptotic role of IF1.

Conclusions:

  • The IF1-OSCP interaction plays a crucial role in inhibiting apoptosis in cancer cells.
  • Targeting the IF1-OSCP interaction with specific peptides can disrupt this pro-oncogenic pathway.
  • OSCP represents a promising target for developing novel anti-cancer therapies.