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  The SNARE protein SNAP-25 is linked to fast calcium triggering of exocytosis

Soerensen, J. B., Matti, U., Wei, S. H., Nehring, R., Voets, T., Ashery, U., et al. (2002). The SNARE protein SNAP-25 is linked to fast calcium triggering of exocytosis. Proceedings of the National Academy of Sciences of the United States of America, 99(3), 1627-1632. Retrieved from http://www.pnas.org/content/99/3/1627.full.pdf+html.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0012-F445-C Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0028-815D-7
Genre: Journal Article

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Soerensen, J. B.1, Author              
Matti, U., Author
Wei, S. H., Author
Nehring, R.2, Author              
Voets, T.2, Author              
Ashery, U.2, Author              
Binz, T., Author
Neher, E.2, Author              
Rettig, J.2, Author              
Affiliations:
1Research Group of Molecular Mechanisms of the Exocytosis, MPI for biophysical chemistry, Max Planck Society, ou_578584              
2Department of Membrane Biophysics, MPI for biophysical chemistry, Max Planck Society, ou_578579              

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 Abstract: Synchronous neurotransmission depends on the tight coupling between Ca2+ influx and fusion of neurotransmitter-filled vesicles with the plasma membrane. The vesicular soluble N- ethylmaleimide-sensitive factor attachment protein receptor (SNARE) protein synaptobrevin 2 and the plasma membrane SNARES syntaxin 1 and synaptosomal protein of 25 kDa (SNAP-25) are essential for calcium-triggered exocytosis. However, the link between calcium triggering and SNARE function remains elusive. Here we describe mutations in two sites on the surface of the SNARE complex formed by acidic and hydrophilic residues of SNAP-25 and synaptobrevin 2, which were found to coordinate divalent cations in the neuronal SNARE complex crystal structure, By reducing the net charge of the site in SNAP-25 we identify a mutation that interferes with calcium triggering of exocytosis when overexpressed in chromaffin cells. Exocytosis was elicited by photorelease of calcium from a calcium cage and evaluated by using patch-clamp capacitance measurements at millisecond time resolution. We present a method for monitoring the dependence of exocytotic rate upon calcium concentration at the release site and demonstrate that the mutation decreased the steepness of this relationship, indicating that the number of sequential calcium-binding steps preceding exocytosis is reduced by one. We conclude that the SNARE complex is linked directly to calcium triggering of exocytosis, most likely in a complex with auxiliary proteins.

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Language(s): eng - English
 Dates: 2002-02-05
 Publication Status: Published in print
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 Rev. Method: Peer
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Title: Proceedings of the National Academy of Sciences of the United States of America
Source Genre: Journal
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Pages: - Volume / Issue: 99 (3) Sequence Number: - Start / End Page: 1627 - 1632 Identifier: -