Where in the release machinery does SV2A sit, and what is it known to do? · Grey Matter

SV2A is a protein of the vesicle membrane itself, present on the vesicles of almost every synapse, beside synaptobrevin and synaptotagmin.

Where in the release machinery does SV2A sit, and what is it known to do?

SV2A is a protein of the vesicle membrane itself, present on the vesicles of almost every synapse, beside synaptobrevin and synaptotagmin. Synapses without it release transmitter less reliably and mice lacking it have severe seizures, so it helps keep vesicles ready for calcium-triggered fusion. Its precise molecular job is still unsettled: it resembles a transporter, it interacts with synaptotagmin, and its substrate, if it has one, is unknown. Structures published in 2024 show where the antiseizure drugs and botulinum toxin A bind on it.