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Related Concept Videos

Asymmetric Lipid Bilayer01:35

Asymmetric Lipid Bilayer

Biological membranes show uneven distribution of different types of lipids in the inner and outer layers, resulting in transverse asymmetric membranes. The treatment of the erythrocyte membrane with the enzyme phospholipase confirmed the asymmetric nature of the lipid bilayer. The enzyme hydrolyzes lipids into fatty acids and hydrophilic groups. The phospholipase acts only on the outer layer of the membrane, while the inner layer remains intact. The phospholipase treatment resulted in 80%...
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Different physical properties of lipids and proteins allow them to localize and form distinct islands or domains in the membrane. Some membrane domains are formed due to protein-protein interactions, whereas others are formed due to the presence of specific lipids such as sphingolipids and sterols—for example, large proteins, such as bacteriorhodopsin, aggregate and create distinct domains.
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Lipid Exchange Assay in Living Cells
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Published on: March 21, 2025

Dynamic lipid lateral segregation driven by lauryl cyclodextrin interactions at the membrane surface.

Michel Roux1, Edward Sternin, Véronique Bonnet

  • 1CEA/DSV/iBiTec-S, UMR CNRS 8221, SB2SM, F-91191 Gif sur Yvette Cedex, France.

Langmuir : the ACS Journal of Surfaces and Colloids
|February 16, 2013
PubMed
Summary

Amphiphilic cyclodextrins, like monolauryl-β-cyclodextrin (βMLC), dynamically insert into lipid bilayers, causing phase separation and altered fluidity. This differs from previous derivatives, showing new membrane behaviors.

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Area of Science:

  • Biophysics
  • Supramolecular Chemistry
  • Membrane Biophysics

Background:

  • Amphiphilic cyclodextrins combine host-guest chemistry with membrane properties.
  • Previous derivatives (βChol, βDLC) induced distinct lipid phase separations.
  • Understanding amphiphilic cyclodextrin interactions with lipid bilayers is crucial for drug delivery and biomaterials.

Purpose of the Study:

  • To investigate the membrane insertion and phase behavior of a novel amphiphilic cyclodextrin, monolauryl-β-cyclodextrin (βMLC).
  • To compare the effects of βMLC with previously studied amphiphilic cyclodextrins on lipid bilayer organization.
  • To elucidate the role of the lipid chain length and cyclodextrin structure in membrane dynamics.

Main Methods:

  • Deuterium Nuclear Magnetic Resonance (NMR) spectroscopy to study lipid dynamics and phase behavior.
  • Synthesis and characterization of monolauryl-β-cyclodextrin (βMLC).
  • Preparation of chain-deuterated DMPC-d27 lipid bilayers for NMR studies.

Main Results:

  • βMLC insertion into DMPC-d27 bilayers leads to dynamic phase separation (L'CD phase) with significant lipid exchange.
  • The βMLC-induced L'CD phase remains partially fluid below the main lipid transition, unlike the gel phase induced by dilauryl derivatives.
  • βMLC promotes lipid chain ordering within the L'CD phase due to deep membrane insertion, while trimethylated analogs show only ordering without phase separation.

Conclusions:

  • Monolauryl-β-cyclodextrin (βMLC) exhibits dynamic membrane insertion and induces a distinct, partially fluid cyclodextrin-enriched phase.
  • The number of lipid chains in the amphiphilic anchor significantly influences the phase behavior and dynamics of cyclodextrin-lipid interactions.
  • βMLC represents a new class of amphiphilic cyclodextrins with unique membrane interaction properties, offering potential for tailored biomaterial design.