Transport, capture and exocytosis of single synaptic vesicles at active zones

To sustain high rates of transmitter release, synaptic terminals must rapidly re-supply vesicles to release sites and prime them for exocytosis. Here we describe imaging of single synaptic vesicles near the plasma membrane of live ribbon synaptic terminals. Vesicles were captured at small, discrete...

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Veröffentlicht in:Nature (London) 2000-08, Vol.406 (6798), p.849-854
Hauptverfasser: Almers, W, Zenisek, D, Steyer, J. A
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Zenisek, D
Steyer, J. A
description To sustain high rates of transmitter release, synaptic terminals must rapidly re-supply vesicles to release sites and prime them for exocytosis. Here we describe imaging of single synaptic vesicles near the plasma membrane of live ribbon synaptic terminals. Vesicles were captured at small, discrete active zones near the terminal surface. An electric stimulus caused them to undergo rapid exocytosis, seen as the release of a fluorescent lipid from the vesicles into the plasma membrane. Next, vesicles held in reserve about 20 nm from the plasma membrane advanced to exocytic sites, and became release-ready 250 ms later. Apparently a specific structure holds vesicles at an active zone to bring v-SNAREs and t-SNAREs, the proteins that mediate vesicle fusion, within striking distance of each other, and then allows the triggered movement of such vesicles to the plasma membrane.
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subjects Animals
Biological and medical sciences
Biological Transport
Cell physiology
Cellular biology
Exocytosis
Fundamental and applied biological sciences. Psychology
Goldfish
In Vitro Techniques
Lipids
Membrane Fusion
Membranes
Microscopy, Video
Molecular and cellular biology
Neurons
Neurons - metabolism
Reserves
Retina - cytology
Ribbons
Secretion. Exocytosis
SNARE complex
Surface chemistry
Synaptic Vesicles - metabolism
Terminals
Transport
Vesicles
title Transport, capture and exocytosis of single synaptic vesicles at active zones
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