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Related Experiment Videos

Melittin-induced changes in lipid multilayers. A solid-state NMR study.

R Smith1, F Separovic, F C Bennett

  • 1Biochemistry Department, University of Queensland, Australia.

Biophysical Journal
|August 1, 1992
PubMed
Summary
This summary is machine-generated.

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Bee venom peptide melittin affects lipid headgroup order and acyl chain dynamics in phospholipid multilayers. Melittin influences molecular organization near the bilayer surface, impacting lipid chain motions.

Area of Science:

  • Biophysics
  • Membrane biophysics
  • NMR spectroscopy

Background:

  • Phospholipid bilayers are fundamental to cell membranes.
  • Melittin, a bee venom peptide, interacts with lipid bilayers.
  • Understanding peptide-lipid interactions is crucial for membrane biophysics.

Purpose of the Study:

  • To investigate the effects of melittin on phospholipid multilayers.
  • To determine how melittin influences lipid molecular organization and dynamics.
  • To explore melittin's impact on lipid headgroup and acyl chain behavior.

Main Methods:

  • Solid-state Nuclear Magnetic Resonance (NMR) spectroscopy (1H, 13C, 14N, 31P).
  • Study of aligned multilayers of dimyristoyl-, dilauryl-, and ditetradecyl-phosphatidylcholines.

Related Experiment Videos

  • Analysis of samples above the gel to liquid-crystalline transition temperature (Tc).

    • Main Results:

    • Melittin did not alter the mosaic spread of lipid molecules at lipid:peptide ratios of 10:1 or higher.
    • No hexagonal or isotropic phases were observed.
    • Melittin affected headgroup order and molecular organization in the acyl chains near the bilayer surface.
    • Melittin restricted nanosecond-scale motions while enhancing slower, collective motions.

    Conclusions:

    • Melittin modulates lipid headgroup order and surface acyl chain organization.
    • The peptide influences lipid dynamics across different timescales.
    • Melittin's interaction with phospholipid bilayers is complex, affecting both order and motion.