Referenced in: none

Automatically associated channels: Cav2.1 , Cav2.2

Title: Bassoon specifically controls presynaptic P/Q-type Ca(2+) channels via RIM-binding protein.

Authors: Daria Davydova, Claudia Marini, Claire King, Julia Klueva, Ferdinand Bischof, Stefano Romorini, Carolina Montenegro-Venegas, Martin Heine, Romy Schneider, Markus S Schröder, Wilko D Altrock, Christian Henneberger, Dmitri A Rusakov, Eckart D Gundelfinger, Anna Fejtova

Journal, date & volume: Neuron, 2014 Apr 2 , 82, 181-94

PubMed link: http://www.ncbi.nlm.nih.gov/pubmed/24698275

Abstract
Voltage-dependent Ca(2+) channels (CaVs) represent the principal source of Ca(2+) ions that trigger evoked neurotransmitter release from presynaptic boutons. Ca(2+) influx is mediated mainly via CaV2.1 (P/Q-type) and CaV2.2 (N-type) channels, which differ in their properties. Their relative contribution to synaptic transmission changes during development and tunes neurotransmission during synaptic plasticity. The mechanism of differential recruitment of CaV2.1 and CaV2.2 to release sites is largely unknown. Here, we show that the presynaptic scaffolding protein Bassoon localizes specifically CaV2.1 to active zones via molecular interaction with the RIM-binding proteins (RBPs). A genetic deletion of Bassoon or an acute interference with Bassoon-RBP interaction reduces synaptic abundance of CaV2.1, weakens P/Q-type Ca(2+) current-driven synaptic transmission, and results in higher relative contribution of neurotransmission dependent on CaV2.2. These data establish Bassoon as a major regulator of the molecular composition of the presynaptic neurotransmitter release sites.