Synapse and Active Zone Assembly in the Absence of Presynaptic Ca2+ Channels and Ca2+ Entry.

Abstract:

:Presynaptic CaV2 channels are essential for Ca2+-triggered exocytosis. In addition, there are two competing models for their roles in synapse structure. First, Ca2+ channels or Ca2+ entry may control synapse assembly. Second, active zone proteins may scaffold CaV2s to presynaptic release sites, and synapse structure is CaV2 independent. Here, we ablated all three CaV2s using conditional knockout in cultured hippocampal neurons or at the calyx of Held, which abolished evoked exocytosis. Compellingly, synapse and active zone structure, vesicle docking, and transsynaptic nano-organization were unimpaired. Similarly, long-term blockade of action potentials and Ca2+ entry did not disrupt active zone assembly. Although CaV2 knockout impaired the localization of β subunits, α2δ-1 localized normally. Rescue with CaV2 restored exocytosis, and CaV2 active zone targeting depended on the intracellular C-terminus. We conclude that synapse assembly is independent of CaV2s or Ca2+ entry through them. Instead, active zone proteins recruit and anchor CaV2s via CaV2 C-termini.

journal_name

Neuron

journal_title

Neuron

authors

Held RG,Liu C,Ma K,Ramsey AM,Tarr TB,De Nola G,Wang SSH,Wang J,van den Maagdenberg AMJM,Schneider T,Sun J,Blanpied TA,Kaeser PS

doi

10.1016/j.neuron.2020.05.032

subject

Has Abstract

pub_date

2020-08-19 00:00:00

pages

667-683.e9

issue

4

eissn

0896-6273

issn

1097-4199

pii

S0896-6273(20)30401-3

journal_volume

107

pub_type

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