V-ATPase membrane sector associates with synaptobrevin to modulate neurotransmitter release. - Inserm - Institut national de la santé et de la recherche médicale Access content directly
Journal Articles Neuron Year : 2010

V-ATPase membrane sector associates with synaptobrevin to modulate neurotransmitter release.

Abstract

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 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.

Dates and versions

inserm-00581203 , version 1 (30-03-2011)

Identifiers

Cite

Jérôme Di Giovanni, Sami Boudkkazi, Sumiko Mochida, Andrzej Bialowas, Nada Samari, et al.. V-ATPase membrane sector associates with synaptobrevin to modulate neurotransmitter release.. Neuron, 2010, 67 (2), pp.268-79. ⟨10.1016/j.neuron.2010.06.024⟩. ⟨inserm-00581203⟩
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