[PDF][PDF] V-ATPase membrane sector associates with synaptobrevin to modulate neurotransmitter release

J Di Giovanni, S Boudkkazi, S Mochida, A Bialowas… - Neuron, 2010 - cell.com
J Di Giovanni, S Boudkkazi, S Mochida, A Bialowas, N Samari, C Lévêque, F Youssouf…
Neuron, 2010cell.com
Acidification of synaptic vesicles by the vacuolar proton ATPase is essential for loading with
neurotransmitter. Debated findings have suggested that V-ATPase membrane domain (V0)
also contributes to Ca 2+-dependent transmitter release via a direct role in vesicle
membrane fusion, but the underlying mechanisms remain obscure. We now report a direct
interaction between V0 c-subunit and the v-SNARE synaptobrevin, constituting a molecular
link between the V-ATPase and SNARE-mediated fusion. Interaction domains were mapped …
Summary
Acidification of synaptic vesicles by the vacuolar proton ATPase is essential for loading with neurotransmitter. Debated findings have suggested that V-ATPase membrane domain (V0) also contributes to Ca2+-dependent transmitter release via a direct role in vesicle membrane fusion, but the underlying mechanisms remain obscure. We now report a direct interaction between V0 c-subunit and the v-SNARE synaptobrevin, constituting a molecular link between the V-ATPase and SNARE-mediated fusion. Interaction domains were mapped to the membrane-proximal domain of VAMP2 and the cytosolic 3.4 loop of c-subunit. Acute perturbation of this interaction with c-subunit 3.4 loop peptides did not affect synaptic vesicle proton pump activity, but induced a substantial decrease in neurotransmitter release probability, inhibiting glutamatergic as well as cholinergic transmission in cortical slices and cultured sympathetic neurons, respectively. Thus, V-ATPase may ensure two independent functions: proton transport by a fully assembled V-ATPase and a role in SNARE-dependent exocytosis by the V0 sector.
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