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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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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 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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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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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.
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Related Experiment Video

Updated: Apr 5, 2026

SNARE-mediated Fusion of Single Proteoliposomes with Tethered Supported Bilayers in a Microfluidic Flow Cell Monitored by Polarized TIRF Microscopy
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Membrane tension and membrane fusion.

Michael M Kozlov1, Leonid V Chernomordik2

  • 1Department of Physiology and Pharmacology, Sackler Faculty of Medicine, Tel Aviv University, 69978 Tel Aviv, Israel.

Current Opinion in Structural Biology
|August 19, 2015
PubMed
Summary

Cell membrane tension is crucial for cell biological processes like membrane fusion. This study explores how membrane tension drives fusion pore expansion, proposing it requires high tension or specific protein accumulation.

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Area of Science:

  • Cell Biology
  • Biophysics

Background:

  • Cell membrane remodeling involves complex processes regulated by membrane lateral tension.
  • Membrane fusion is a critical event in various cellular functions, including cell-to-cell communication and exocytosis.

Purpose of the Study:

  • To investigate the role of membrane tension in driving membrane fusion.
  • To explore the physical mechanisms and forces involved in membrane tension generation and its impact on fusion pore expansion.

Main Methods:

  • Discussion of the physics of membrane tension.
  • Analysis of forces generating tension in the plasma membrane.
  • Hypothesizing the role of tension in fusion pore dynamics.

Main Results:

  • Membrane tension is a key regulator of cell membrane shaping and remodeling.
  • Tension is hypothesized to power the expansion of fusion pores during late-stage fusion events.
  • Fusion pore expansion may be facilitated by high membrane tensions or low line tensions due to protein accumulation.

Conclusions:

  • Membrane lateral tension plays a significant role in regulating membrane fusion.
  • Fusion pore expansion is proposed to be driven by membrane tension, potentially requiring high tensions or specific protein configurations.
  • Increasing the distance between membranes facilitates the fusion reaction.