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Water Structure at the Lipid Multibilayer Surface: Anionic Versus Cationic Head Group Effects.

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Investigating water dynamics at lipid interfaces reveals how headgroup charge impacts molecular behavior. The phosphate group in anionic lipids significantly structures water differently than cationic lipids.

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Area of Science:

  • Biophysical Chemistry
  • Interface Science
  • Molecular Dynamics

Background:

  • The membrane-water interface is crucial for biochemical reactions.
  • Understanding water structure and dynamics at this interface is key to elucidating biological roles.
  • Lipid headgroup chemistry dictates water behavior at membrane surfaces.

Purpose of the Study:

  • To investigate the effects of anionic and cationic lipid headgroups on water structure and dynamics.
  • To elucidate the role of the phosphate group in structuring interfacial water.
  • To compare water vibrational dynamics on anionic and cationic lipid multibilayers.

Main Methods:

  • Femtosecond infrared (IR) pump-probe spectroscopy.
  • Studying vibrational dynamics of HOD (a water isotopologue) molecules.
  • Analysis of vibrational energy and rotational relaxation times.

Main Results:

  • Anionic phospho-lipid multibilayers exhibited two distinct water vibrational lifetime components (0.5 ps and 1.9 ps).
  • Cationic choline-derivatized lipid multibilayers showed a single water vibrational lifetime component (1.6 ps).
  • The phosphate group in anionic lipids plays a significant role in structuring interfacial water.

Conclusions:

  • Lipid headgroup charge profoundly influences water structure and dynamics at the membrane interface.
  • The phosphate group is identified as a key component in organizing interfacial water molecules.
  • These findings provide molecular-level insights into water's role in membrane-associated biological reactions.