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Structural features of the C8 antiviral peptide in a membrane-mimicking environment

Mario Scrima1, Sara Di Marino2, Manuela Grimaldi1

  • 1Department of Pharmacy, University of Salerno, Fisciano, Italy.

Biochimica Et Biophysica Acta
|December 27, 2013
PubMed

Insights

The feline immunodeficiency virus peptide C8 shows antiviral activity by blocking cell entry. Its structure and membrane interactions depend on membrane charge, impacting potential anti-HIV drug development.

Area of Science:

  • Biophysics
  • Structural Biology
  • Virology

Background:

  • Feline immunodeficiency virus (FIV) coat protein gp36 contains membrane-proximal external functional domains.
  • These domains are crucial for viral entry and are potential targets for novel anti-HIV therapeutics.
  • Current anti-retroviral therapies have limitations, necessitating new drug development strategies.

Purpose of the Study:

  • To investigate the conformational properties of the C8 peptide.
  • To understand the interaction of C8 with different membrane surfaces.
  • To elucidate how membrane charge influences C8's behavior and antiviral potential.

Main Methods:

  • Circular dichroism spectroscopy
  • Nuclear magnetic resonance (NMR) spectroscopy
  • Fluorescence spectroscopy
  • Molecular dynamics simulations in a micelle-water system

Main Results:

  • Membrane charge significantly modulates the secondary structure of the C8 peptide.
  • On zwitterionic membranes, C8 adopts canonical structures with hydrophobic Trp residue interactions.
  • On negatively charged membranes, C8 shows disordered conformations and non-specific interactions, leading to membrane destabilization.

Conclusions:

  • The C8 peptide's conformation and membrane interaction are sensitive to the lipid environment.
  • Understanding these interactions provides insights into viral entry mechanisms.
  • Modulating membrane interactions of viral peptides could be a strategy for developing new antiviral agents.
Keywords:
Conformational analysisGlycoproteinNMRViral fusion

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