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SNAREs and Membrane Fusion

SNAREs and Membrane Fusion

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...

Fusion of Secretory Vesicles with the Plasma Membrane

Fusion of Secretory Vesicles with the Plasma Membrane

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...

Mechanisms of Membrane Domain Formation

Mechanisms of Membrane Domain Formation

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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Mechanisms of Membrane-bending

Mechanisms of Membrane-bending

The living membranes are flexible due to their fluid mosaic nature; however, their bending into different shapes is an active process regulated by specific lipids and proteins. The membrane bending can be transient as seen in vesicles or stable for a long time as in microvilli. Cells regulate the size, location, and duration of the membrane curvature.
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Membrane Fluidity

Membrane Fluidity

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.Fatty acids tails of phospholipids can be either saturated or...

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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.
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Related Experiment Video

Updated: Jun 25, 2026

SNARE-mediated Fusion of Single Proteoliposomes with Tethered Supported Bilayers in a Microfluidic Flow Cell Monitored by Polarized TIRF Microscopy

SNARE-mediated Fusion of Single Proteoliposomes with Tethered Supported Bilayers in a Microfluidic Flow Cell Monitored by Polarized TIRF Microscopy

Published on: August 24, 2016

Understanding membrane fusion combining experimental and simulation studies.

¹Department of Physiology, Wayne State University School of Medicine, Detroit, Michigan 48201, USA.

Methods in Cell Biology

|February 7, 2009

Summary

Calcium ions are essential for membrane fusion, facilitating lipid mixing by forming bridges between bilayers. This process is enabled by the removal of water molecules, allowing SNARE proteins to bring membranes close enough for fusion.

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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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Analysis of SNARE-mediated Membrane Fusion Using an Enzymatic Cell Fusion Assay

Analysis of SNARE-mediated Membrane Fusion Using an Enzymatic Cell Fusion Assay

Published on: October 19, 2012

Area of Science:

Biochemistry
Biophysics
Molecular Biology

Background:

SNARE proteins (t-SNARE and v-SNARE) mediate membrane fusion by bringing bilayers into close proximity.
Calcium ions are known to play a crucial role in initiating and driving this fusion process.

Purpose of the Study:

To investigate the mechanism by which calcium ions induce membrane fusion mediated by SNARE proteins.
To elucidate the role of water molecules and ion complexation in the fusion process.

Main Methods:

X-ray diffraction and light scattering measurements on SNARE-reconstituted liposomes.
Atomistic molecular dynamic simulations using hydrated dimethylphosphate anions (DMP(-)) and calcium cations.

Main Results:

Membrane fusion does not occur without calcium, suggesting hydrated calcium ions are too large for the SNARE-apposed bilayer space.
In the presence of calcium, calcium-phosphate bridges form, expelling water and enabling lipid mixing and fusion.
Molecular dynamics simulations confirmed the formation of Ca(2+)-DMP complexes and water removal, reducing the distance between bilayers to 2.92 A.

Conclusions:

Calcium ions induce membrane fusion by forming bridges that displace water, overcoming the steric hindrance of hydrated ions.
The observed reduction in bilayer distance aligns with SNARE-mediated apposition, supporting the proposed fusion mechanism.