Kinetics of synaptotagmin responses to Ca2+ and assembly with the core SNARE complex onto membranes.

Abstract:

:The synaptic vesicle protein synaptotagmin I binds Ca2+ and is required for efficient neurotransmitter release. Here, we measure the response time of the C2 domains of synaptotagmin to determine whether synaptotagmin is fast enough to function as a Ca2+ sensor for rapid exocytosis. We report that synaptotagmin is "tuned" to sense Ca2+ concentrations that trigger neuronal exocytosis. The speed of response is unique to synaptotagmin I and readily satisfies the kinetic constraints of synaptic vesicle membrane fusion. We further demonstrate that Ca2+ triggers penetration of synaptotagmin into membranes and simultaneously drives assembly of synaptotagmin onto the base of the ternary SNARE (soluble N-ethylmaleimide-sensitive fusion protein [NSF] attachment receptor) complex, near the transmembrane anchor of syntaxin. These data support a molecular model in which synaptotagmin triggers exocytosis through its interactions with membranes and the SNARE complex.

journal_name

Neuron

journal_title

Neuron

authors

Davis AF,Bai J,Fasshauer D,Wolowick MJ,Lewis JL,Chapman ER

doi

10.1016/s0896-6273(00)80850-8

subject

Has Abstract

pub_date

1999-10-01 00:00:00

pages

363-76

issue

2

eissn

0896-6273

issn

1097-4199

pii

S0896-6273(00)80850-8

journal_volume

24

pub_type

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