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Alamethicin aggregation in lipid membranes.

Jianjun Pan1, Stephanie Tristram-Nagle, John F Nagle

  • 1Department of Physics, Carnegie Mellon University, Pittsburgh, PA 15213, USA.

The Journal of Membrane Biology
|October 1, 2009
PubMed
Summary
This summary is machine-generated.

Alamethicin (Alm) forms peptide bundles in model membranes, with bundle size influenced by lipid type. These bundles and associated clusters exhibit unique X-ray scattering patterns, revealing structural organization in lipid bilayers.

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Area of Science:

  • Structural Biology
  • Biophysics
  • Materials Science

Background:

  • Alamethicin (Alm) is a peptide known to form pores in lipid bilayers.
  • Understanding peptide-lipid interactions is crucial for membrane protein function and drug design.
  • Model membrane systems allow controlled investigation of peptide aggregation and structural effects.

Purpose of the Study:

  • To investigate the X-ray scattering features induced by alamethicin aggregates in oriented model membranes.
  • To determine the structure and aggregation state of alamethicin within different lipid bilayers.
  • To explore the influence of lipid composition and hydration on alamethicin organization.

Main Methods:

  • X-ray scattering experiments were performed on oriented stacks of DOPC and diC22:1PC model membranes.
  • Varying alamethicin:lipid ratios and hydration levels were employed.
  • Scattering data was fitted to molecular dynamics simulations for structural interpretation.

Main Results:

  • Bragg rod scattering indicated the formation of alamethicin bundles (n monomers) in a barrel-stave configuration.
  • Bundle size varied with lipid type: n=6 in DOPC and n>=9 in diC22:1PC, attributed to hydrophobic mismatch.
  • A second diffuse peak suggested 2D hexagonally packed clusters in equilibrium with Alm bundles, with 3D crystallographic features appearing at reduced humidity.

Conclusions:

  • Alamethicin forms distinct peptide bundles within lipid bilayers, with size dictated by lipid hydrophobic thickness.
  • Hexagonally packed clusters coexist with Alm bundles, indicating complex aggregation behavior.
  • Environmental factors like hydration significantly influence the three-dimensional organization of alamethicin in membranes.