Volume 8, Issue 3 pp. 545-552
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Distribution of Components of the SNARE Complex in Relation to Transmitter Release Sites at the Frog Neuromuscular Junction

Jeanne-Andrée Boudier

Jeanne-Andrée Boudier

INSERM U374, Institut Jean Roche, Faculté de Médecine Secteur Nord, Bd. Pierre Dramard, 13916 Marseille Cedex 20, France

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Nathalie Charvin

Nathalie Charvin

INSERM U374, Institut Jean Roche, Faculté de Médecine Secteur Nord, Bd. Pierre Dramard, 13916 Marseille Cedex 20, France

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Jean-Louis Boudier

Corresponding Author

Jean-Louis Boudier

INSERM U374, Institut Jean Roche, Faculté de Médecine Secteur Nord, Bd. Pierre Dramard, 13916 Marseille Cedex 20, France

Correspondence to: J.-A. Boudier, as aboveSearch for more papers by this author
Mohammed Fathallah

Mohammed Fathallah

Centre d'Immunologie INSERM-CNRS, Parc Scientifique de Luminy, case 906, 13288 Marseille Cedex 09, France

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Mitsuo Tagaya

Mitsuo Tagaya

Tokyo University of Pharmacy and Life Science, Hachiojii, 192–03 Tokyo, Japan

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Masami Takahashi

Masami Takahashi

Mitsubishi Kasei Institute of Life Science, Machida, 194 Tokyo, Japan

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Michael J. Seagar

Michael J. Seagar

INSERM U374, Institut Jean Roche, Faculté de Médecine Secteur Nord, Bd. Pierre Dramard, 13916 Marseille Cedex 20, France

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First published: March 1996
Citations: 28

Abstract

At the frog neuromuscular junction, neurotransmitter release sites are regularly spaced at 1 μm intervals along the nerve terminal, directly facing postsynaptic folds which contain a high density of acetylcholine receptors. Immunostaining and laser confocal scanning microscopy were used to compare the distribution of presynaptic proteins implicated in exocytosis with that of fluorescent α-bungarotoxin. Syntaxin, synaptosome-associated 25 kDa protein and calcium channels were located predominantly at release sites. Synaptobrevin (vesicle-associated membrane protein) was distributed in the cytoplasm of the nerve terminal, presumably in the packets of microvesicles associated with each active zone. N-Ethylmaleimide-sensitive fusion protein (NSF) and soluble NSF attachment proteins (αβSNAP) displayed a diffuse distribution throughout the terminal cytoplasm and also colocalized in distinct concentrated zones adjacent to the presynaptic membrane.

Abbreviations:

  • αβSNAP
  • soluble NSF attachment proteins
  • AChR
  • acetylcholine receptors
  • Cy5
  • cyanine 5
  • FITC
  • fluorescein isothiocyanate
  • HEPES
  • N-(2-hydroxyethyl)piperazine-N'-(2-ethanesulphonic acid)
  • NSF
  • N-ethylmaleimide-sensitive fusion protein
  • R-αβBuTx
  • rhodamine-tagged bungarotoxin
  • SNAP-25
  • synaptosome-associated 25 kDa protein
  • SNARE
  • SNAP receptor complex
  • VAMP
  • vesicle-associated membrane protein
  • ωGVIA
  • ω-conotoxin GVIA
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