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Heterogeneous molecular distribution in supported multicomponent lipid bilayers.

Fuyuki Tokumasu1, Jeeseong Hwang, James A Dvorak

  • 1Laboratory of Malaria and Vector Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland 20892, USA.

Langmuir : the ACS Journal of Surfaces and Colloids
|March 19, 2005
PubMed
Summary

This study reveals nanoscale lipid organization within membrane domains using near-field scanning optical microscopy (NSOM). Cholesterol influences lipid miscibility and phase separation, impacting membrane structure.

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Area of Science:

  • Membrane biophysics
  • Lipid bilayer organization
  • Nanoscale imaging

Background:

  • Biological membranes feature microscale domains crucial for structure and function.
  • Understanding lipid distribution within these domains is key to membrane dynamics.
  • Heterogeneity in lipid composition drives membrane properties.

Purpose of the Study:

  • To investigate the nanoscale distribution of specific lipids within microscale membrane domains.
  • To elucidate the role of cholesterol in lipid miscibility and phase separation.
  • To characterize domain formation and lipid organization in multicomponent lipid bilayers.

Main Methods:

  • Utilized near-field scanning optical microscopy (NSOM) for high-resolution imaging.
  • Employed fluorescent lipid analogues (Bodipy-PC, DiI-C20:0) for multicolor imaging.

Related Experiment Videos

  • Analyzed lipid distribution in dipalmitoylphosphatidylcholine (DPPC), dilauroylphosphatidylcholine (DLPC), and cholesterol (chol) systems.

    • Main Results:

    • NSOM revealed patchy distributions of Bodipy-PC and DiI-C20:0, indicating phase separation.
    • In cholesterol-free bilayers, DPPC localized at domain edges, while DLPC dispersed throughout.
    • Cholesterol increased lipid miscibility but did not eliminate phase separations; average domain sizes were 140-200 nm.

    Conclusions:

    • Nanoscale lipid organization significantly impacts membrane domain behavior.
    • Cholesterol plays a critical role in modulating lipid miscibility and phase separation within membrane domains.
    • High-resolution NSOM provides insights into complex membrane phase phenomena unresolvable by conventional microscopy.