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.
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http://www.hal.inserm.fr/inserm-00581203
Contributeur : Oussama El Far <>
Soumis le : mercredi 30 mars 2011 - 14:17:41
Dernière modification le : vendredi 16 mars 2018 - 09:36:01

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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, Elsevier, 2010, 67 (2), pp.268-79. 〈10.1016/j.neuron.2010.06.024〉. 〈inserm-00581203〉

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