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Snapin: a SNARE-associated protein implicated in synaptic transmission.

Authors:
Ilardi JM, Mochida S, Sheng ZH
Affiliation:
Journal:
Nature neuroscience

Abstract

Synaptic vesicle docking and fusion are mediated by the assembly of a stable SNARE core complex of proteins, which include the synaptic vesicle membrane protein VAMP/synaptobrevin and the plasmalemmal proteins syntaxin and SNAP-25. We have now identified another SNAP-25-binding protein, called Snapin. Snapin was enriched in neurons and exclusively located on synaptic vesicle membranes. It associated with the SNARE complex through direct interaction with SNAP-25. Binding of recombinant Snapin-CT to SNAP-25 blocked the association of the SNARE complex with synaptotagmin. Introduction of Snapin-CT and peptides containing the SNAP-25 binding sequence into presynaptic superior cervical ganglion neurons in culture reversibly inhibited synaptic transmission. These results suggest that Snapin is an important component of the neurotransmitter release process through its modulation of the sequential interactions between the SNAREs and synaptotagmin.

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