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Related Concept Videos

Fusion of Secretory Vesicles with the Plasma Membrane01:26

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...
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Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
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Studying the Cytoskeleton

The cytoskeletal architecture can be studied using different microscopic and biochemical techniques. Electron microscopy was instrumental in discovering the cytoskeletal architecture around the 1960s, which allowed obtaining structural information at a high-resolution level. However, the sample preparation procedure often limits this ability in biological samples. Several protocols have been developed over the years to optimize sample preparation. In one of the protocols known as rotary...

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Related Experiment Video

Updated: May 31, 2026

Examination of Synaptic Vesicle Recycling Using FM Dyes During Evoked, Spontaneous, and Miniature Synaptic Activities
08:10

Examination of Synaptic Vesicle Recycling Using FM Dyes During Evoked, Spontaneous, and Miniature Synaptic Activities

Published on: March 31, 2014

Synaptic vesicles studied by dynamic light scattering.

S Castorph1, S Schwarz Henriques, M Holt

  • 1Institut für Röntgenphysik, Georg-August-Universität Göttingen, Germany. scastor@gwdg.de

The European Physical Journal. E, Soft Matter
|June 28, 2011
PubMed
Summary
This summary is machine-generated.

Dynamic light scattering (DLS) precisely measures synaptic vesicle (SV) size distribution. This technique also quantifies and aids in removing contaminants, and characterizes SV fusion with proteoliposomes.

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Area of Science:

  • Neuroscience
  • Biophysics
  • Biochemistry

Background:

  • Synaptic vesicles (SVs) are crucial for neurotransmission.
  • Accurate characterization of SV size and fusion dynamics is essential for understanding neuronal function.
  • Existing methods may be limited in resolving SV polydispersity and fusion events.

Purpose of the Study:

  • To characterize the size polydispersity distribution of synaptic vesicles (SVs) using dynamic light scattering (DLS).
  • To quantify and reduce contaminant structures in SV fractions.
  • To characterize SV fusion with proteoliposomes using DLS.

Main Methods:

  • Dynamic Light Scattering (DLS) for size distribution analysis.
  • Asymmetric-flow field-flow (AFFF) fractionation for contaminant removal.
  • Analysis of intensity autocorrelation functions using constrained regularization and direct modeling.
  • Vesicle fusion assays with syntaxin 1 and SNAP-25A.

Main Results:

  • DLS accurately determined SV size polydispersity under quasi-physiological conditions.
  • AFFF fractionation effectively reduced larger contaminant structures in SV preparations.
  • DLS results quantitatively agreed with cryogenic electron microscopy data.
  • DLS successfully quantified size increases in proteoliposomes due to SNARE-dependent SV fusion.

Conclusions:

  • DLS is a robust method for characterizing SV size polydispersity and fusion.
  • Contaminant structures in SV preparations can be identified and reduced.
  • SNARE-mediated fusion leads to quantifiable changes in vesicle size detectable by DLS.