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  Rapid fusion of synaptic vesicles with reconstituted target SNARE membranes.

Kiessling, V., Ahmed, S., Domanska, M. K., Holt, M., Jahn, R., & Tamm, L. K. (2013). Rapid fusion of synaptic vesicles with reconstituted target SNARE membranes. Biophysical Journal, 104(9), 1950-1958. doi:10.1016/j.bpj.2013.03.038.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-769A-2 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0028-47AC-5
Genre: Journal Article

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Kiessling, V., Author
Ahmed, S.1, Author              
Domanska, M. K., Author
Holt, M.1, Author              
Jahn, R.1, Author              
Tamm, L. K., Author
Affiliations:
1Department of Neurobiology, MPI for biophysical chemistry, Max Planck Society, ou_578595              

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 Abstract: Neurotransmitter release at neuronal synapses occurs on a timescale of 1 ms or less. Reconstitution of vesicle fusion from purified synaptic proteins and lipids has played a major role in elucidating the synaptic exocytotic fusion machinery with ever increasing detail. However, one limitation of most reconstitution approaches has been the relatively slow rate of fusion that can be produced in these systems. In a related study, a notable exception is an approach measuring fusion of single reconstituted vesicles bearing the vesicle fusion protein synaptobrevin with supported planar membranes harboring the presynaptic plasma membrane proteins syntaxin and SNAP-25. Fusion times of ∼20 ms were achieved in this system. Despite this advance, an important question with reconstituted systems is how well they mimic physiological systems they are supposed to reproduce. In this work, we demonstrate that purified synaptic vesicles from rat brain fuse with acceptor-SNARE containing planar bilayers equally fast as equivalent reconstituted vesicles and that their fusion efficiency is increased by divalent cations. Calcium boosts fusion through a combined general electrostatic and synaptotagmin-specific mechanism.

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Language(s): eng - English
 Dates: 2013-05-07
 Publication Status: Published in print
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 Rev. Method: Peer
 Identifiers: DOI: 10.1016/j.bpj.2013.03.038
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Title: Biophysical Journal
Source Genre: Journal
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Pages: - Volume / Issue: 104 (9) Sequence Number: - Start / End Page: 1950 - 1958 Identifier: -