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Related Experiment Videos

Structure of gel phase DMPC determined by X-ray diffraction.

Stephanie Tristram-Nagle1, Yufeng Liu, Justin Legleiter

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

Biophysical Journal
|December 24, 2002
PubMed
Summary

The structure of dimyristoylphosphatidylcholine lipid bilayers was determined at 10°C. Key structural parameters like chain tilt angle and area per lipid were quantified, revealing insights into lipid bilayer organization.

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Review of lipid bilayer structure.

Chemistry and physics of lipids·2026

Area of Science:

  • Biophysics
  • Lipid Bilayer Structure
  • Materials Science

Background:

  • Understanding lipid bilayer structure is crucial for cell membrane function.
  • Dimyristoylphosphatidylcholine (DMPC) is a common model phospholipid.

Purpose of the Study:

  • To determine the detailed structure of fully hydrated gel phase DMPC lipid bilayers.
  • To quantify key structural parameters such as chain tilt angle and area per lipid.

Main Methods:

  • X-ray diffraction on oriented lipid multilayers.
  • Analysis of low and wide-angle diffraction data.
  • Fourier reconstructions and model fitting of electron density profiles.

Main Results:

  • Chain tilt angle measured at 32.3 ± 0.6 degrees, independent of mild dehydration.

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  • Area per lipid (A) determined as 47.2 ± 0.5 Ų.
  • Compressibility modulus (K(A)) found to be 500 ± 100 dyn/cm.

    • Conclusions:

    • The study provides precise structural data for DMPC lipid bilayers in the gel phase.
    • Quantified parameters offer insights into lipid packing and mechanical properties.
    • Findings contribute to the understanding of membrane biophysics and lipid behavior.