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Ligand Nano-cluster Arrays in a Supported Lipid Bilayer
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Published on: April 23, 2017

Ordered nanoclusters in lipid-cholesterol membranes.

Maria K Ratajczak1, Eva Y Chi, Shelli L Frey

  • 1Department of Physics, Institute for Biophysical Dynamics, and The James Franck Institute, The University of Chicago, 929 E. 57th Street, Chicago, Illinois 60637, USA.

Physical Review Letters
|August 8, 2009
PubMed
Summary

Sphingomyelin-dihydrocholesterol (SM-DChol) monolayers exhibit 2D ordering, forming nanoclusters. Above a specific composition, excess dihydrocholesterol (DChol) segregates, showing increased mobility.

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Area of Science:

  • Biophysics
  • Materials Science
  • Physical Chemistry

Background:

  • Lipid monolayers are crucial models for cell membranes.
  • Understanding lipid mixtures provides insights into membrane structure and function.

Purpose of the Study:

  • To investigate the 2D ordering and phase behavior of sphingomyelin-dihydrocholesterol (SM-DChol) mixtures.
  • To characterize the nanocluster formation and the role of dihydrocholesterol (DChol) in these lipidic systems.

Main Methods:

  • X-ray diffraction was employed to analyze the 2D ordering of SM-DChol monolayers.
  • Reflectivity data were used to assess the vertical mobility of components.

Main Results:

  • Short-ranged 2D ordering (approx. 25 Å) was observed in SM-DChol monolayers.
  • Two distinct regions were identified: a constant d spacing below 35 mol% DChol and a linear increase above the cusp, following Vegard's law.
  • Excess DChol forms a separate population with higher vertical mobility above the cusp.

Conclusions:

  • SM-DChol mixtures form a "lipidic alloy" with a defined SM-DChol entity and excess DChol.
  • The phase behavior indicates segregation of uncomplexed DChol at higher concentrations, impacting monolayer properties.