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Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
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Structural Effects of Cation Binding to DPPC Monolayers.

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Summary
This summary is machine-generated.

Calcium ions significantly alter lipid packing and headgroup structure in cell membranes by binding to phosphatidylcholine. Sodium ions have minimal effects, while chloride ions penetrate deeply at high concentrations.

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Area of Science:

  • Biophysics
  • Computational Chemistry
  • Spectroscopy

Background:

  • Plasma membrane ion concentrations influence membrane properties and signaling.
  • The extracellular leaflet is rich in phosphatidylcholine lipids and affected by Na+, Ca2+, and Cl- ions.

Purpose of the Study:

  • To investigate the effects of Na+, Ca2+, and Cl- ions on dipalmitoylphosphatidylcholine structure using molecular dynamics simulations and VSFG spectroscopy.
  • To compare simulation results with experimental data using lipid monolayers as membrane proxies.

Main Methods:

  • Molecular dynamics simulations with advanced models.
  • Vibrational Sum Frequency Generation (VSFG) spectroscopy.
  • Lipid monolayer experiments as a membrane model.

Main Results:

  • Na+ ions exhibit minor effects on lipid structure.
  • Ca2+ ions strongly influence headgroup conformations, promoting tighter lipid packing and the liquid condensed phase.
  • Ca2+ binding involves phosphate and carbonyl oxygens through direct and water-mediated interactions.
  • Changes in lipid area per molecule and CaCl2 concentration show anticorrelated effects on headgroup conformations.
  • At high CaCl2 concentrations, Cl- ions penetrate the monolayer, altering VSFG spectra and indicating new binding modes.

Conclusions:

  • Ca2+ ions play a crucial role in modulating membrane structure and phase behavior.
  • The interplay between cations and anions affects lipid organization and headgroup interactions.
  • VSFG spectroscopy is sensitive to ion binding and structural changes within lipid monolayers.