- EMDB-22789: Human Connexin-26 Hemichannel (open conformation) -
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基本情報
登録情報
データベース: EMDB / ID: EMD-22789
タイトル
Human Connexin-26 Hemichannel (open conformation)
マップデータ
試料
複合体: Hexameric Human Connexin-26 Hemichannel
タンパク質・ペプチド: Gap junction beta-2 protein
機能・相同性
機能・相同性情報
Transport of connexons to the plasma membrane / response to human chorionic gonadotropin / gap junction-mediated intercellular transport / epididymis development / gap junction channel activity involved in cell communication by electrical coupling / Oligomerization of connexins into connexons / Transport of connexins along the secretory pathway / gap junction assembly / connexin complex / gap junction ...Transport of connexons to the plasma membrane / response to human chorionic gonadotropin / gap junction-mediated intercellular transport / epididymis development / gap junction channel activity involved in cell communication by electrical coupling / Oligomerization of connexins into connexons / Transport of connexins along the secretory pathway / gap junction assembly / connexin complex / gap junction / Gap junction assembly / gap junction channel activity / astrocyte projection / cellular response to glucagon stimulus / inner ear development / endoplasmic reticulum-Golgi intermediate compartment / decidualization / lateral plasma membrane / cellular response to dexamethasone stimulus / response to retinoic acid / response to ischemia / response to progesterone / sensory perception of sound / transmembrane transport / response to estradiol / cell-cell signaling / cellular response to oxidative stress / cell body / response to lipopolysaccharide / calcium ion binding / perinuclear region of cytoplasm / identical protein binding / plasma membrane 類似検索 - 分子機能
Gap junction beta-2 protein (Cx26) / Connexin / Connexin, N-terminal / Connexin, conserved site / Gap junction protein, cysteine-rich domain / Connexin, N-terminal domain superfamily / Connexin / Connexins signature 1. / Connexins signature 2. / Connexin homologues / Gap junction channel protein cysteine-rich domain 類似検索 - ドメイン・相同性
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R01 HL48908
米国
引用
ジャーナル: Structure / 年: 2021 タイトル: Cryo-EM structure of an open conformation of a gap junction hemichannel in lipid bilayer nanodiscs. 著者: Ali K Khan / Maciej Jagielnicki / Brad C Bennett / Michael D Purdy / Mark Yeager / 要旨: To mediate cell-to-cell communication via gap junction channels (GJCs), connexins (Cx) traffic as hexameric hemichannels to the plasma membrane, which dock end-to-end between adjacent cell membranes, ...To mediate cell-to-cell communication via gap junction channels (GJCs), connexins (Cx) traffic as hexameric hemichannels to the plasma membrane, which dock end-to-end between adjacent cell membranes, thereby forming a dodecameric intercellular conduit. Hemichannels also function independently to mediate the passage of contents between the cytoplasm and extracellular space. To generate hemichannels, the mutation N176Y was introduced into the second extracellular loop of Cx26. The electron cryomicroscopy structure of the hexameric hemichannel in lipid bilayer nanodiscs displays an open pore and a 4-helix bundle transmembrane design that is nearly identical to dodecameric GJCs. In contrast to the high resolution of the transmembrane α-helices, the extracellular loops are less well resolved. The conformational flexibility of the extracellular loops may be essential to facilitate surveillance of hemichannels in apposed cells to identify compatible Cx isoforms that enable intercellular docking. Our results also provide a structural foundation for previous electrophysiologic and permeation studies of Cx hemichannels.
凍結剤: ETHANE / 装置: FEI VITROBOT MARK IV 詳細: After application of sample to the pegylated UltrAuFoil grid, sample was blotted for 7-8 seconds at blot force of 5, in 100% humidity at 4 degrees C..
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電子顕微鏡法
顕微鏡
FEI TITAN KRIOS
特殊光学系
エネルギーフィルター - 名称: GIF Quantum LS / エネルギーフィルター - スリット幅: 20 eV
撮影
フィルム・検出器のモデル: FEI FALCON III (4k x 4k) 検出モード: COUNTING / 撮影したグリッド数: 1 / 平均露光時間: 8.0 sec. / 平均電子線量: 42.0 e/Å2
電子線
加速電圧: 300 kV / 電子線源: FIELD EMISSION GUN
電子光学系
照射モード: SPOT SCAN / 撮影モード: BRIGHT FIELD / 倍率(公称値): 130000