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Related Experiment Videos

SNARE function analyzed in synaptobrevin/VAMP knockout mice.

S Schoch1, F Deák, A Königstorfer

  • 1Center for Basic Neuroscience, Department of Molecular Genetics, Howard Hughes Medical Institute, The University of Texas Southwestern Medical Center, Dallas, TX 75390-9111, USA.

Science (New York, N.Y.)
|November 3, 2001
PubMed
Summary

Soluble NSF-attachment protein receptors (SNAREs) are key to membrane fusion. This study shows synaptobrevin 2 is crucial for fast calcium-triggered fusion but not essential for all synaptic vesicle fusion events.

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Molecular Biology

Background:

  • Soluble NSF-attachment protein receptors (SNAREs) are critical for membrane fusion.
  • The exact role of SNAREs in fusion specificity, catalysis, or execution remains debated.
  • Synaptobrevin/VAMP 2 is the key SNARE protein for synaptic vesicle fusion in the forebrain.

Purpose of the Study:

  • To investigate the precise function of synaptobrevin 2 in synaptic vesicle fusion.
  • To differentiate between proposed roles of SNAREs in fusion specificity, catalysis, or execution.

Main Methods:

  • Generation of knockout mice lacking synaptobrevin/VAMP 2.
  • Electrophysiological recordings to measure synaptic vesicle fusion rates.
  • Assessment of spontaneous, hypertonic sucrose-induced, and Ca2+-triggered fusion.

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Main Results:

  • Synaptic vesicle fusion, both spontaneous and hypertonic sucrose-induced, decreased ~10-fold in synaptobrevin 2 knockout mice.
  • Fast Ca2+-triggered synaptic vesicle fusion was reduced by over 100-fold in the absence of synaptobrevin 2.
  • These findings indicate synaptobrevin 2 is essential for rapid, calcium-dependent fusion.

Conclusions:

  • Synaptobrevin 2 plays a significant role in catalyzing fusion reactions and stabilizing fusion intermediates.
  • While critical for efficient synaptic vesicle fusion, synaptobrevin 2 is not absolutely required for all fusion events.
  • The data suggest a model where synaptobrevin 2 is vital for rapid, regulated fusion but not for basal or non-specific fusion processes.