Journal: Sci Adv / Year: 2023 Title: Munc13- and SNAP25-dependent molecular bridges play a key role in synaptic vesicle priming. Authors: Christos Papantoniou / Ulrike Laugks / Julia Betzin / Cristina Capitanio / José Javier Ferrero / José Sánchez-Prieto / Susanne Schoch / Nils Brose / Wolfgang Baumeister / Benjamin H ...Authors: Christos Papantoniou / Ulrike Laugks / Julia Betzin / Cristina Capitanio / José Javier Ferrero / José Sánchez-Prieto / Susanne Schoch / Nils Brose / Wolfgang Baumeister / Benjamin H Cooper / Cordelia Imig / Vladan Lučić / Abstract: Synaptic vesicle tethering, priming, and neurotransmitter release require a coordinated action of multiple protein complexes. While physiological experiments, interaction data, and structural studies ...Synaptic vesicle tethering, priming, and neurotransmitter release require a coordinated action of multiple protein complexes. While physiological experiments, interaction data, and structural studies of purified systems were essential for our understanding of the function of the individual complexes involved, they cannot resolve how the actions of individual complexes integrate. We used cryo-electron tomography to simultaneously image multiple presynaptic protein complexes and lipids at molecular resolution in their native composition, conformation, and environment. Our detailed morphological characterization suggests that sequential synaptic vesicle states precede neurotransmitter release, where Munc13-comprising bridges localize vesicles <10 nanometers and soluble -ethylmaleimide-sensitive factor attachment protein 25-comprising bridges <5 nanometers from the plasma membrane, the latter constituting a molecularly primed state. Munc13 activation supports the transition to the primed state via vesicle bridges to plasma membrane (tethers), while protein kinase C promotes the same transition by reducing vesicle interlinking. These findings exemplify a cellular function performed by an extended assembly comprising multiple molecularly diverse complexes.
pH: 7.4 / Component - Concentration: 300.0 mM / Component - Formula: HBM / Component - Name: Hepes-buffered medium Details: 140 mM NaCl, 5 mM KCl, 5mM NaHCO3, 1.2 mM NaH2PO4-H2O, 1 mM MgCl26-H2O, 10 mM Glucose, 10 mM Hepes, 1.2 mM CaCl2
Grid
Model: Quantifoil R2/1 / Material: GOLD / Mesh: 200 / Support film - Material: CARBON / Support film - topology: HOLEY
Vitrification
Cryogen name: ETHANE / Instrument: HOMEMADE PLUNGER Details: Portable manual plunger made at Max Planck Institute of Biochemistry.
Details
Synaptosomal fraction (P2) was obtained from DIV 28-30 hippocampal organotypic slices. These hippocampal organotypic slices were obtained from E18 mice.
Cryo protectant
None
Sectioning
Other: NO SECTIONING
Fiducial marker
Manufacturer: Aurion / Diameter: 10 nm
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Electron microscopy
Microscope
FEI TITAN KRIOS
Specialist optics
Phase plate: VOLTA PHASE PLATE / Energy filter - Slit width: 20 eV
Software
Name: SerialEM
Image recording
Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: COUNTING / Average electron dose: 1.5 e/Å2
Electron beam
Acceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
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