Synaptotagmin-1 may be a distance regulator acting upstream of SNARE nucleation

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作者
Geert van den Bogaart
Shashi Thutupalli
Jelger H Risselada
Karsten Meyenberg
Matthew Holt
Dietmar Riedel
Ulf Diederichsen
Stephan Herminghaus
Helmut Grubmüller
Reinhard Jahn
机构
[1] Max Planck Institute for Biophysical Chemistry,Department of Neurobiology
[2] Max Planck Institute for Dynamics and Self-Organization,Department of Dynamics of Complex Fluids
[3] Max Planck Institute for Biophysical Chemistry,Department of Theoretical and Computational Biophysics
[4] Institute for Organic and Biomolecular Chemistry,undefined
[5] Georg-August University,undefined
[6] Facility for Electron Microscopy,undefined
[7] Max Planck Institute for Biophysical Chemistry,undefined
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摘要
Synaptotagmin-1 is known to accelerate membrane fusion during neuronal exocytosis in response to Ca2+, but how it does this is unclear. By probing the activity of synaptotagmin-1 under conditions of low ionic strength, it is now shown that SNARE-mediated fusion is dependent on synaptotagmin-1, which tethers liposomes together but at distances too far for fusion. Ca2+ then induces synaptotagmin-1 to bring the liposomes closer together, allowing fusion to proceed.
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页码:805 / 812
页数:7
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