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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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Enzymes like flippase, floppase, and scramblase transfer phospholipids from one layer to another in the membrane, thereby affecting membrane asymmetry.
Flippase
Eukaryotic flippases are type-IV P-type ATPases or P4-ATPases belonging to P-type ATPase family proteins that are membrane-bound pumps involved in the ATP-mediated transport of ions and molecules across the membrane. Flippases flip specific phospholipids from the outer to the inner leaflet of a membrane. All P4-ATPases have one...
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Once a transport vesicle has recognized its target organelle, the vesicular membrane needs to fuse with the target membrane to unload the cargo. Transmembrane proteins called SNAREs present on organelle membranes and their vesicles, mediate vesicle fusion.
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Biological membranes are more than just a barrier separating cell cytoplasm from the outside environment. They are highly dynamic and help maintain the integrity and physiological stability of the cells as well as membrane-bound organelles. Membranes also play vital roles in cell-to-cell and intracellular communication.
A large chunk of any biological membrane is composed of phospholipids. These lipids have a heterogeneous distribution across different subcellular organelles and even between...

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Related Experiment Video

Updated: May 25, 2026

A Nanobar-Supported Lipid Bilayer System for the Study of Membrane Curvature Sensing Proteins in vitro
08:27

A Nanobar-Supported Lipid Bilayer System for the Study of Membrane Curvature Sensing Proteins in vitro

Published on: November 30, 2022

Nonintercalating nanosubstrates create asymmetry between bilayer leaflets.

Sameer Varma1, Michael Teng, H Larry Scott

  • 1Department of Biological, Chemical and Physical Sciences, Center of Molecular Study of Soft Condensed Matter, Illinois Institute of Technology, Chicago, Illinois 60616, United States.

Langmuir : the ACS Journal of Surfaces and Colloids
|January 14, 2012
PubMed
Summary
This summary is machine-generated.

Nanoscopic substrates can alter lipid bilayer properties, creating leaflet asymmetry. These interactions are not a simple interpolation and have biological implications for membrane-protein interactions.

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Area of Science:

  • Biophysics
  • Materials Science
  • Computational Chemistry

Background:

  • Lipid bilayer properties are sensitive to environmental factors.
  • Understanding membrane-substrate interactions is crucial for cell biology and drug delivery.

Purpose of the Study:

  • To investigate the effects of nanoscopic substrates on lipid bilayer physical properties.
  • To explore the role of surface hydroxyl density in substrate-bilayer interactions.
  • To characterize the asymmetry induced in lipid bilayers by finite nanoscopic supports.

Main Methods:

  • Molecular dynamics simulations of palmitoyl-oleoyl phosphatidylcholine bilayers.
  • Exposure to model nanosized substrates with varying surface hydroxyl densities.
  • Analysis of lipid bilayer properties including fluctuations, charge density, diffusion, and order parameters.

Main Results:

  • A surface hydroxyl density of 10% was sufficient to juxtapose bilayers to substrates.
  • Substrates induced asymmetry between bilayer leaflets in transverse lipid fluctuations, charge density profiles, and lipid diffusion rates.
  • Lipid cross-sectional areas, component volumes, and order parameters were minimally affected.

Conclusions:

  • Nanoscopic substrate interactions create significant leaflet asymmetry, exceeding that seen with infinite supports.
  • The proximity to finite nanoscopic supports leads to stronger support-bilayer electrostatic coupling.
  • Membrane interactions with nanoscopic contact points are complex and not a simple interpolation, with implications for biological systems like cytoskeleton-membrane interactions.