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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 Fluidity01:23

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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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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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Fluid Mosaic Model01:19

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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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Fusion of Secretory Vesicles with the Plasma Membrane01:26

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Proteins and neurotransmitters in secretory vesicles can be released from a cell upon vesicle docking, priming, and fusion with the plasma membrane. Vesicles are docked and primed in preparation for the quick exocytosis of their contents in response to a stimulus. The fusion process is mainly carried out by a SNAP Receptor or SNARE complex, consisting of synaptobrevin, syntaxin-1, and SNAP-25.
In 1993, Jim Rothman proposed that the antiparallel pairing of vesicular and transmembrane SNAREs, or...
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Mechanisms of Membrane Domain Formation00:59

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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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Author Spotlight: Advancing Cell Membrane Biophysics - Exploring Interactions and Challenges Through Experimental and Computational Approaches
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Molecular Dynamics Simulation for Membrane Fusion.

Owen Tyoe1,2, Kai Zhang3, Jiajie Diao4

  • 1Department of Physics, University of Cincinnati College of Arts and Sciences, Cincinnati, OH, USA.

Methods in Molecular Biology (Clifton, N.J.)
|January 13, 2025
PubMed
Summary

We used all-atom molecular dynamics simulations to reveal the molecular mechanisms of membrane fusion driven by soluble N-ethylmaleimide sensitive factor attachment protein receptor (SNARE) proteins and accessory factors like complexin and alpha-synuclein.

Keywords:
MD simulationMembrane fusionSNARE proteinsSynaptic vesicles

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Area of Science:

  • Biophysics
  • Computational Biology
  • Molecular Biology

Background:

  • Membrane fusion is a fundamental biological process essential for various cellular functions.
  • Soluble N-ethylmaleimide sensitive factor attachment protein receptor (SNARE) proteins are key drivers of membrane fusion.
  • Accessory proteins like complexin and alpha-synuclein modulate SNARE-mediated fusion.

Purpose of the Study:

  • To elucidate the molecular mechanisms underlying membrane fusion.
  • To predict protein and lipid conformations, membrane geometry, and their interactions during fusion.
  • To provide a detailed understanding of distinct membrane fusion stages.

Main Methods:

  • All-atom molecular dynamics (MD) simulations were employed.
  • The simulation workflow included pre-MD construction, setup in GROMACS, MD execution in GROMACS, and subsequent analysis.
  • Atomic models were used to describe complex chemical systems with femtosecond precision.

Main Results:

  • MD simulations provided insights into distinct membrane fusion stages: docking, hemifusion, and kiss-and-run fusion.
  • The method allows for prediction of protein and lipid conformations and membrane geometry.
  • Interactions between proteins and lipids at the membrane interface were characterized.

Conclusions:

  • All-atom MD simulations are a powerful tool for investigating the molecular details of membrane fusion.
  • This approach offers femtosecond precision in understanding complex biological processes.
  • The study provides a framework for future investigations into SNARE-mediated membrane fusion.