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Related Experiment Video

Updated: Jan 19, 2026

Asymmetric Walkway: A Novel Behavioral Assay for Studying Asymmetric Locomotion
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Asymmetric Bilayers by Hemifusion: Method and Leaflet Behaviors.

Thais A Enoki1, Gerald W Feigenson1

  • 1Department of Molecular Biology and Genetics, Cornell University, Ithaca, New York.

Biophysical Journal
|September 9, 2019
PubMed
Summary

Researchers developed a new method to create asymmetric giant unilamellar vesicles (aGUVs) using hemifusion. This technique allows for controlled lipid exchange, forming distinct domains within the vesicle bilayer, impacting its properties.

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Area of Science:

  • Biophysics
  • Materials Science
  • Membrane Biology

Background:

  • Giant unilamellar vesicles (GUVs) are crucial models for cell membranes.
  • Creating asymmetric lipid bilayers in GUVs is challenging.
  • Understanding lipid organization impacts membrane function.

Purpose of the Study:

  • To develop a novel method for preparing asymmetric giant unilamellar vesicles (aGUVs).
  • To investigate lipid exchange and its effect on bilayer properties during aGUV formation.
  • To characterize the resulting lipid domains in asymmetric membranes.

Main Methods:

  • Hemifusion of GUVs with supported lipid bilayers triggered by calcium.
  • Utilizing fluorescent dyes to monitor lipid distribution in inner and outer leaflets.
  • Employing dye partition coefficients and generalized polarization to assess bilayer properties.

Main Results:

  • Hemifusion successfully facilitated lipid exchange, primarily into the outer leaflet of aGUVs.
  • Exchanged lipids significantly altered bilayer properties, leading to induced-disordered and induced-ordered domains.
  • These induced domains exhibited distinct lipid packing compared to conventional symmetric domains.

Conclusions:

  • Hemifusion provides a viable route for generating aGUVs with controlled asymmetry.
  • The method allows for the creation of novel lipid domains with unique physical characteristics.
  • This technique offers new possibilities for studying membrane heterogeneity and function.