Diffusional spread and confinement of newly exocytosed synaptic vesicle proteins

Niclas Gimber, Georgi Tadeus, Tanja Maritzen, Jan Schmoranzer () and Volker Haucke ()
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Niclas Gimber: Leibniz Institut für Molekulare Pharmakologie (FMP) & Freie Universität Berlin
Georgi Tadeus: Leibniz Institut für Molekulare Pharmakologie (FMP) & Freie Universität Berlin
Tanja Maritzen: Leibniz Institut für Molekulare Pharmakologie (FMP) & Freie Universität Berlin
Jan Schmoranzer: Leibniz Institut für Molekulare Pharmakologie (FMP) & Freie Universität Berlin
Volker Haucke: Leibniz Institut für Molekulare Pharmakologie (FMP) & Freie Universität Berlin

Nature Communications, 2015, vol. 6, issue 1, 1-11

Abstract: Abstract Neurotransmission relies on the calcium-triggered exocytic fusion of non-peptide neurotransmitter-containing small synaptic vesicles (SVs) with the presynaptic membrane at active zones (AZs) followed by compensatory endocytic retrieval of SV membranes. Here, we study the diffusional fate of newly exocytosed SV proteins in hippocampal neurons by high-resolution time-lapse imaging. Newly exocytosed SV proteins rapidly disperse within the first seconds post fusion until confined within the presynaptic bouton. Rapid diffusional spread and confinement is followed by slow reclustering of SV proteins at the periactive endocytic zone. Confinement within the presynaptic bouton is mediated in part by SV protein association with the clathrin-based endocytic machinery to limit diffusional spread of newly exocytosed SV proteins. These data suggest that diffusion, and axonal escape of newly exocytosed vesicle proteins, are counteracted by the clathrin-based endocytic machinery together with a presynaptic diffusion barrier.

Date: 2015
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms9392

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DOI: 10.1038/ncomms9392

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