RIM determines Ca²+ channel density and vesicle docking at the presynaptic active zone.
RIM determines Ca²+ channel density and vesicle docking at the presynaptic active zone.
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DOI:
10.1016/j.neuron.2010.12.014
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发表时间:
2011-01-27
期刊:
影响因子:
16.2
通讯作者:
Schneggenburger R
中科院分区:
文献类型:
--
作者:
Han Y;Kaeser PS;Südhof TC;Schneggenburger R
At presynaptic active zones, neurotransmitter release is initiated by the opening of voltage-gated Ca2+ channels close to docked vesicles. The mechanisms that enrich Ca2+ channels at active zones are, however, largely unknown, possibly because of the limited presynaptic accessibility of most synapses. Here, we have established a Cre-lox based conditional knock-out approach at a presynaptically accessible CNS synapse, the calyx of Held, to directly study the functions of RIM proteins. Removal of all RIM1/2 isoforms strongly reduced the presynaptic Ca2+ channel density, revealing a new role of RIM proteins in Ca2+ channel targeting. Removal of RIMs also reduced the readily-releasable pool, paralleled by a similar reduction of the number of docked vesicles, and the Ca2+ channel - vesicle coupling was decreased. Thus, RIM proteins co-ordinately regulate key functions for fast transmitter release: enabling a high presynaptic Ca2+ channel density, and vesicle docking at the active zone.
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