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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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Related Experiment Video

Updated: Jul 8, 2026

Enrichment of Mammalian Tissues and Xenopus Oocytes with Cholesterol
10:12

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Published on: March 25, 2020

Enantiospecific interactions between cholesterol and phospholipids.

Juha-Matti Alakoskela1, Karen Sabatini, Xin Jiang

  • 1Helsinki Biophysics and Biomembrane Group, Institute of Biomedicine/Biochemistry, P.O. Box 63, University of Helsinki, 00014 Helsinki, Finland. jmalakos@cc.helsinki.fi

Langmuir : the ACS Journal of Surfaces and Colloids
|January 4, 2008
PubMed
Summary

Cholesterol

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Area of Science:

  • Biochemistry
  • Membrane Biophysics

Background:

  • Cholesterol's interaction with membrane proteins is crucial.
  • Its influence may stem from direct binding or altering lipid bilayers.

Purpose of the Study:

  • To investigate if cholesterol's effects on membrane proteins are due to direct binding or lipid bilayer property changes.
  • To differentiate the roles of natural cholesterol and its enantiomer, ent-cholesterol.

Main Methods:

  • Observing ordered domain shapes in phospholipid monolayers.
  • Utilizing fluorescence microscopy to analyze domain chirality.

Main Results:

  • Phospholipid chirality significantly impacts domain chirality.
  • Cholesterol chirality shows a minor effect, primarily in racemic dipalmitoylphosphatidylcholine monolayers.
  • This minor effect likely arises from cholesterol-cholesterol interactions.

Conclusions:

  • Cholesterol's chirality has a limited impact on membrane structure.
  • This effect is unlikely to be significant in biological membranes due to the requirement of solid-like domains.