ジャーナル: Sci Adv / 年: 2023 タイトル: Munc13- and SNAP25-dependent molecular bridges play a key role in synaptic vesicle priming. 著者: Christos Papantoniou / Ulrike Laugks / Julia Betzin / Cristina Capitanio / José Javier Ferrero / José Sánchez-Prieto / Susanne Schoch / Nils Brose / Wolfgang Baumeister / Benjamin H Cooper ...著者: 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 / 要旨: 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 / 構成要素 - 濃度: 300.0 mM / 構成要素 - 式: HBM / 構成要素 - 名称: Hepes-buffered medium 詳細: 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
凍結剤: ETHANE / 装置: HOMEMADE PLUNGER 詳細: Portable manual plunger made at Max Planck Institute of Biochemistry.
詳細
Synaptosomal fraction (P2) was obtained from DIV 28-30 hippocampal organotypic slices. These hippocampal organotypic slices were obtained from E18 mice.
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None
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その他: NO SECTIONING
位置合わせマーカー
Manufacturer: Aurion / 直径: 10 nm
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電子顕微鏡法
顕微鏡
FEI TITAN KRIOS
特殊光学系
位相板: VOLTA PHASE PLATE / エネルギーフィルター - スリット幅: 20 eV