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-Structure paper
| タイトル | Structure and topography of the synaptic V-ATPase-synaptophysin complex. |
|---|---|
| ジャーナル・号・ページ | Nature, Year 2024 |
| 掲載日 | 2024年6月5日 |
 著者 | Chuchu Wang / Wenhong Jiang / Jeremy Leitz / Kailu Yang / Luis Esquivies / Xing Wang / Xiaotao Shen / Richard Held / Daniel J Adams / Tamara Basta / Lucas Hampton / Ruiqi Jian / Lihua Jiang / Michael H B Stowell / Wolfgang Baumeister / Qiang Guo / Axel T Brunger /    |
| PubMed 要旨 | Synaptic vesicles are organelles with a precisely defined protein and lipid composition, yet the molecular mechanisms for the biogenesis of synaptic vesicles are mainly unknown. Here, we discovered a ...Synaptic vesicles are organelles with a precisely defined protein and lipid composition, yet the molecular mechanisms for the biogenesis of synaptic vesicles are mainly unknown. Here, we discovered a well-defined interface between the synaptic vesicle V-ATPase and synaptophysin by in situ cryo-electron tomography and single particle cryo-electron microscopy of functional synaptic vesicles isolated from mouse brains. The synaptic vesicle V-ATPase is an ATP-dependent proton pump that establishes the protein gradient across the synaptic vesicle, which in turn drives the uptake of neurotransmitters. Synaptophysin and its paralogs synaptoporin and synaptogyrin belong to a family of abundant synaptic vesicle proteins whose function is still unclear. We performed structural and functional studies of synaptophysin knockout mice, confirming the identity of synaptophysin as an interaction partner with the V-ATPase. Although there is little change in the conformation of the V-ATPase upon interaction with synaptophysin, the presence of synaptophysin in synaptic vesicles profoundly affects the copy number of V-ATPases. This effect on the topography of synaptic vesicles suggests that synaptophysin assists in their biogenesis. In support of this model, we observed that synaptophysin knockout mice exhibit severe seizure susceptibility, suggesting an imbalance of neurotransmitter release as a physiological consequence of the absence of synaptophysin. |
 リンク | Nature / PubMed:38838737 |
| 手法 | EM (単粒子) / EM (トモグラフィー) / EM (サブトモグラム平均) |
| 解像度 | 3.6 - 18.2 Å |
| 構造データ | EMDB-44839, PDB-9bra: EMDB-44840, PDB-9brq: EMDB-44841, PDB-9brr: EMDB-44842, PDB-9brs: EMDB-44843, PDB-9brt: EMDB-44844, PDB-9bru: EMDB-44845, PDB-9bry: EMDB-44846, PDB-9brz:  EMDB-44847: Tomograms of isolated synaptic vesicles from Syp-/- mouse brain  EMDB-44848: Tomograms of isolated synaptic vesicles from wild-type mouse brain  EMDB-44855: Intact state1 V-ATPase of isolated synaptic vesicles from wild-type mouse brain by subtomogram averaging  EMDB-44856: Intact state2 V-ATPase of isolated synaptic vesicles from wild-type mouse brain by subtomogram averaging  EMDB-44857: Intact state3 V-ATPase of isolated synaptic vesicles from wild-type mouse brain by subtomogram averaging  EMDB-44858: V0-only V-ATPase of isolated synaptic vesicles from wild-type mouse brain by subtomogram averaging |
| 化合物 |  ChemComp-NAG:  ChemComp-BMA: |
| 由来 |
|
 キーワード |  MEMBRANE PROTEIN (膜タンパク質) / V-ATPase / synaptic vesicle (シナプス小胞) / V0only V-ATPase |
