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Updated: Jul 17, 2025

Evaluation of Synaptic Multiplicity Using Whole-cell Patch-clamp Electrophysiology
Published on: April 23, 2019
Turbocharging synaptic transmission.
James E Rothman1, Kirill Grushin1, Manindra Bera1
1Nanobiology Institute and Department of Cell Biology, Yale University, New Haven, CT, USA.
Synaptotagmin rings coordinate synaptic vesicle release by organizing SNAREpins. Peripheral SNAREpins, boosted by Complexin, accelerate neurotransmitter release for rapid synaptic transmission.
Area of Science:
- Neuroscience
- Molecular Biology
- Biochemistry
Background:
- Synaptotagmin is implicated in synaptic vesicle (SV) clamping and release.
- Synchronous neurotransmission relies on precise SV fusion.
- SNARE proteins mediate membrane fusion.
Purpose of the Study:
- To elucidate the structural organization and functional role of SNAREpins in SV release.
- To investigate the contribution of peripheral SNAREpins to the speed of neurotransmitter release.
Main Methods:
- Biochemical assays
- Genetic analysis
- Electron microscopy
- Cell-free system measurements
Main Results:
- A ring of 12 SNAREpins per SV, with six central and six peripheral.
- Central SNAREpins directly bind Synaptotagmin and are Ca++-sensitive.
- Peripheral SNAREpins, bridged by Complexin, enhance fusion speed.
- Synaptophysin hexamers contribute VAMP to both SNAREpin types.
Conclusions:
- Synaptotagmin-organized SNAREpins control SV fusion.
- Peripheral SNAREpins and Complexin 'turbocharge' neurotransmitter release.
- This mechanism explains rapid synchronous neurotransmission.
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