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SNARE Function Analyzed in Synaptobrevin/VAMP Knockout Mice
Susanne Schoch,14*Ferenc Deák,14*Andreas Königstorfer,5*Marina Mozhayeva,1Yildirim Sara,1Thomas C. Südhof,124Ege T. Kavalali13
SNAREs (soluble NSF-attachment protein receptors) are generally
acknowledged as central components of membrane fusion reactions,but
their precise function has remained enigmatic. Competing hypothesessuggest roles for SNAREs in mediating the specificity of fusion,catalyzing fusion, or actually executing fusion. We generatedknockout
mice lacking synaptobrevin/VAMP 2, the vesicular SNAREprotein
responsible for synaptic vesicle fusion in forebrain synapses,to make
use of the exquisite temporal resolution of electrophysiologyin
measuring fusion. In the absence of synaptobrevin 2, spontaneoussynaptic vesicle fusion and fusion induced by hypertonic sucrosewere
decreased ~10-fold, but fast Ca2+-triggered fusion was
decreased more than 100-fold. Thus, synaptobrevin2 may function in
catalyzing fusion reactions and stabilizingfusion intermediates but is
not absolutely required for synapticfusion.
1 Center for Basic Neuroscience, Departments of
2 Molecular Genetics and
3 Physiology, and
4 Howard
Hughes Medical Institute, The University of Texas Southwestern
Medical Center, Dallas, TX 75390-9111, USA.
5 Department of Molecular Neurobiology,
Max-Planck-Institut für Experimentelle Medizin, 37075 Göttingen, Germany.
*
These authors contributed equally to this work.
To whom correspondence should be addressed.
E-mail: Thomas.Sudhof{at}UTSouthwestern.edu,
Ege.Kavalali{at}UTSouthwestern.edu
The editors suggest the following Related Resources on Science sites:
In Science Magazine
PERSPECTIVES
Suzie J. Scales, Michael F. A. Finley, and Richard H. Scheller (2 November 2001) Science294 (5544), 1015.
[DOI: 10.1126/science.1066728] |Summary »|Full Text »|PDF »
REPORTS
Chih-Tien Wang, Ruslan Grishanin, Cynthia A. Earles, Payne Y. Chang, Thomas F. J. Martin, Edwin R. Chapman, and Meyer B. Jackson (2 November 2001) Science294 (5544), 1111.
[DOI: 10.1126/science.1064002] |Abstract »|Full Text »|PDF »|Supplemental Data »
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