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Transmembrane helix structure, dynamics, and interactions: multi-nanosecond molecular dynamics simulations

L Shen1, D Bassolino, T Stouch

  • 1Department of Macromolecular Modeling, Bristol-Myers Squibb Research Institute, Princeton, New Jersey 08543-4000, USA.

Biophysical Journal
|July 1, 1997
PubMed
Summary

Molecular dynamics simulations reveal how poly(32)alanine helices interact with dimyristoyphosphatidylcholine (DMPC) lipid bilayers. The helix structure, tilt, and lipid interactions were analyzed, showing localized stability and altered lipid order near the peptide.

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Area of Science:

  • Biophysics
  • Computational Biology
  • Membrane Protein Studies

Background:

  • Understanding membrane protein and lipid interactions is crucial for cell function.
  • Transmembrane protein structure and dynamics influence membrane properties.
  • Molecular dynamics simulations provide atomic-level insights into these complex systems.

Purpose of the Study:

  • To investigate the structural dynamics of a poly(32)alanine helix within a DMPC bilayer.
  • To characterize the interactions between the transmembrane helix and surrounding lipid molecules.
  • To assess the impact of the peptide on the DMPC bilayer's structural and dynamic properties.

Main Methods:

  • All-atom multi-nanosecond molecular dynamics simulations.
  • Simulated a single poly(32)alanine helix in a fully solvated DMPC lipid bilayer.

Related Experiment Videos

  • Analyzed helix stability, tilt, bending, hydrogen bonding, and lipid dynamics.

    • Main Results:

    • The central helical region remained stable, while termini exposed to water became random coils.
    • The helix exhibited significant tilting (up to 30 degrees) and bending, with varying tilts between halves.
    • Frequent peptide-lipid hydrogen bonding led to correlated diffusion; lipid order parameters decreased near the helix, but overall bilayer properties remained largely unchanged.

    Conclusions:

    • Transmembrane helix structure is influenced by interactions with different lipid regions and water.
    • Peptide presence locally perturbs lipid order but does not significantly alter bulk bilayer properties.
    • Molecular dynamics simulations are effective for elucidating detailed membrane/protein interactions at the atomic level.