Journal: EMBO Rep / Year: 2023 Title: Morphofunctional changes at the active zone during synaptic vesicle exocytosis. Authors: Julika Radecke / Raphaela Seeger / Anna Kádková / Ulrike Laugks / Amin Khosrozadeh / Kenneth N Goldie / Vladan Lučić / Jakob B Sørensen / Benoît Zuber / Abstract: Synaptic vesicle (SV) fusion with the plasma membrane (PM) proceeds through intermediate steps that remain poorly resolved. The effect of persistent high or low exocytosis activity on intermediate ...Synaptic vesicle (SV) fusion with the plasma membrane (PM) proceeds through intermediate steps that remain poorly resolved. The effect of persistent high or low exocytosis activity on intermediate steps remains unknown. Using spray-mixing plunge-freezing cryo-electron tomography we observe events following synaptic stimulation at nanometer resolution in near-native samples. Our data suggest that during the stage that immediately follows stimulation, termed early fusion, PM and SV membrane curvature changes to establish a point contact. The next stage-late fusion-shows fusion pore opening and SV collapse. During early fusion, proximal tethered SVs form additional tethers with the PM and increase the inter-SV connector number. In the late-fusion stage, PM-proximal SVs lose their interconnections, allowing them to move toward the PM. Two SNAP-25 mutations, one arresting and one disinhibiting spontaneous release, cause connector loss. The disinhibiting mutation causes loss of membrane-proximal multiple-tethered SVs. Overall, tether formation and connector dissolution are triggered by stimulation and respond to spontaneous fusion rate manipulation. These morphological observations likely correspond to SV transition from one functional pool to another.
Download / File: emd_18744.map.gz / Format: CCP4 / Size: 126.8 MB / Type: IMAGE STORED AS SIGNED INTEGER (2 BYTES)
Annotation
stimulated rat synaptosome
Voxel size
X=Y=Z: 22.4 Å
Density
Minimum - Maximum
-11278.0 - 5441.0
Average (Standard dev.)
209.149020000000007 (±220.108630000000005)
Symmetry
Space group: 1
Details
EMDB XML:
Map geometry
Axis order
X
Y
Z
Origin
-153
-151
88
Dimensions
656
576
176
Spacing
576
656
176
Cell
A: 12902.399 Å / B: 14694.399 Å / C: 3942.4 Å α=β=γ: 90.0 °
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Supplemental data
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Sample components
-
Entire : Stimulated rat synaptosome
Entire
Name: Stimulated rat synaptosome
Components
Cell: Stimulated rat synaptosome
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Supramolecule #1: Stimulated rat synaptosome
Supramolecule
Name: Stimulated rat synaptosome / type: cell / ID: 1 / Parent: 0 Details: sprayed with KCl milliseconds before freezing in order to stimulate exocytosis.
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