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Related Concept Videos

SNAREs and Membrane Fusion01:43

SNAREs and Membrane Fusion

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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.
SNAREs exist in pairs that symmetrically interact and catalyze the fusion of the lipid bilayers in vesicle and target organelle. v-SNARE in the vesicle membrane are single polypeptide chains that bind to a complementary t-SNARE, composed of 2...
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Membrane Fluidity01:26

Membrane Fluidity

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Membrane fluidity is explained by the fluid mosaic model of the cell membrane, which describes the plasma membrane structure as a mosaic of components—including phospholipids, cholesterol, proteins, and carbohydrates—that gives the membrane a fluid character.
Mosaic nature of the membrane
The mosaic characteristic of the membrane helps the plasma membrane remain fluid. The integral proteins and lipids exist as separate but loosely-attached molecules in the membrane. The membrane is...
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Membrane Fluidity01:23

Membrane Fluidity

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Cell membranes are composed of phospholipids, proteins, and carbohydrates loosely attached to one another through chemical interactions. Molecules are generally able to move about in the plane of the membrane, giving the membrane its flexible nature called fluidity. Two other features of the membrane contribute to membrane fluidity: the chemical structure of the phospholipids and the presence of cholesterol in the membrane.
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Fluid Mosaic Model01:19

Fluid Mosaic Model

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Scientists identified the plasma membrane in the 1890s and its principal chemical components (lipids and proteins) by 1915. The model for plasma membrane structure, proposed in 1935 by Hugh Davson and James Danielli, was the first model to be widely accepted in the scientific community. The model was based on the plasma membrane's "railroad track" appearance in early electron micrographs. Davson and Danielli theorized that the plasma membrane's structure resembled a sandwich...
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Asymmetric Lipid Bilayer01:35

Asymmetric Lipid Bilayer

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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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Protein Diffusion in the Membrane01:24

Protein Diffusion in the Membrane

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Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...
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Related Experiment Video

Updated: Apr 21, 2026

Detergent-free Ultrafast Reconstitution of Membrane Proteins into Lipid Bilayers Using Fusogenic Complementary-charged Proteoliposomes.
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Detergent-free Ultrafast Reconstitution of Membrane Proteins into Lipid Bilayers Using Fusogenic Complementary-charged Proteoliposomes.

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Fast membrane hemifusion via dewetting between lipid bilayers.

Jose Nabor Vargas1, Ralf Seemann, Jean-Baptiste Fleury

  • 1Experimental Physics, Saarland University, 66123 Saarbrücken, Germany. jean-baptiste.fleury@physik.uni-saarland.de.

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Summary

This study introduces a microfluidic method to create free-standing hemifused lipid bilayers. This novel technique rapidly forms stable hemifused states, offering new insights into cell membrane behavior.

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SNARE-mediated Fusion of Single Proteoliposomes with Tethered Supported Bilayers in a Microfluidic Flow Cell Monitored by Polarized TIRF Microscopy
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Automated Lipid Bilayer Membrane Formation Using a Polydimethylsiloxane Thin Film
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SNARE-mediated Fusion of Single Proteoliposomes with Tethered Supported Bilayers in a Microfluidic Flow Cell Monitored by Polarized TIRF Microscopy
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Automated Lipid Bilayer Membrane Formation Using a Polydimethylsiloxane Thin Film
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Area of Science:

  • Biophysics
  • Cell Biology
  • Materials Science

Background:

  • Lipid bilayer behavior is crucial for cellular functions like ion transport.
  • Existing methods (supported membranes, vesicles) have limitations in bio-relevance and measurement accessibility.
  • Hemifused states are key intermediates in membrane fusion processes.

Purpose of the Study:

  • To investigate the formation of individual, free-standing hemifused states between model cell membranes.
  • To develop an optimized microfluidic system for studying hemifusion.
  • To enable simultaneous optical and electrophysiological measurements of hemifused states.

Main Methods:

  • Utilized a microfluidic device employing a variation of the droplet interface bilayer (DiB) technique.
  • Formed two model membranes at a specific location within the microfluidic device.
  • Brought the two model membranes into contact to induce hemifusion.

Main Results:

  • Free-standing hemifused states formed rapidly (hundreds of milliseconds) for all tested lipids, significantly faster than previously reported.
  • Hemifusion occurred in a two-stage process, with the second stage explained by a dewetting process.
  • The hemifused states exhibited long lifetimes and fusion events could be triggered by electric fields.

Conclusions:

  • The optimized microfluidic scheme provides a powerful platform for studying lipid bilayer hemifusion.
  • The rapid formation and stability of free-standing hemifused states offer a more biologically relevant model.
  • This method facilitates detailed investigation of membrane fusion dynamics and mechanisms.