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データを開く
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基本情報
登録情報 | ![]() | |||||||||
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タイトル | Cryo-EM structure of Cx26 solubilised in LMNG - hemichannel classification - NConst conformation | |||||||||
![]() | Full map locally sharpened in phenix; classification and masked refinement over A-F hemichannel | |||||||||
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![]() | Gap junction Large Pore Channel Carbon dioxide sensitive / MEMBRANE PROTEIN | |||||||||
機能・相同性 | ![]() Transport of connexons to the plasma membrane / gap junction-mediated intercellular transport / 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 ...Transport of connexons to the plasma membrane / gap junction-mediated intercellular transport / 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 / endoplasmic reticulum-Golgi intermediate compartment / sensory perception of sound / transmembrane transport / cell-cell signaling / calcium ion binding / identical protein binding / plasma membrane 類似検索 - 分子機能 | |||||||||
生物種 | ![]() | |||||||||
手法 | 単粒子再構成法 / クライオ電子顕微鏡法 / 解像度: 2.3 Å | |||||||||
![]() | Brotherton DH / Savva CG / Cameron AD | |||||||||
資金援助 | ![]()
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![]() | ![]() タイトル: Structures of wild-type and a constitutively closed mutant of connexin26 shed light on channel regulation by CO. 著者: Deborah H Brotherton / Sarbjit Nijjar / Christos G Savva / Nicholas Dale / Alexander David Cameron / ![]() 要旨: Connexins allow intercellular communication by forming gap junction channels (GJCs) between juxtaposed cells. Connexin26 (Cx26) can be regulated directly by CO. This is proposed to be mediated ...Connexins allow intercellular communication by forming gap junction channels (GJCs) between juxtaposed cells. Connexin26 (Cx26) can be regulated directly by CO. This is proposed to be mediated through carbamylation of K125. We show that mutating K125 to glutamate, mimicking the negative charge of carbamylation, causes Cx26 GJCs to be constitutively closed. Through cryo-EM we observe that the K125E mutation pushes a conformational equilibrium towards the channel having a constricted pore entrance, similar to effects seen on raising the partial pressure of CO. In previous structures of connexins, the cytoplasmic loop, important in regulation and where K125 is located, is disordered. Through further cryo-EM studies we trap distinct states of Cx26 and observe density for the cytoplasmic loop. The interplay between the position of this loop, the conformations of the transmembrane helices and the position of the N-terminal helix, which controls the aperture to the pore, provides a mechanism for regulation. #1: ![]() タイトル: Structures of wild-type and a constitutively closed mutant of connexin26 shed light on channel regulation by CO2 著者: Brotherton DH / Nijjar S / Savva CG / Dale N / Cameron AD | |||||||||
履歴 |
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構造の表示
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ダウンロードとリンク
-EMDBアーカイブ
マップデータ | ![]() | 288.7 MB | ![]() | |
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ヘッダ (付随情報) | ![]() ![]() | 22.5 KB 22.5 KB | 表示 表示 | ![]() |
FSC (解像度算出) | ![]() | 15.4 KB | 表示 | ![]() |
画像 | ![]() | 135 KB | ||
マスクデータ | ![]() | 316.2 MB | ![]() | |
Filedesc metadata | ![]() | 6.7 KB | ||
その他 | ![]() ![]() ![]() | 250.3 MB 250.8 MB 250.8 MB | ||
アーカイブディレクトリ | ![]() ![]() | HTTPS FTP |
-検証レポート
文書・要旨 | ![]() | 863.7 KB | 表示 | ![]() |
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文書・詳細版 | ![]() | 863.3 KB | 表示 | |
XML形式データ | ![]() | 23.1 KB | 表示 | |
CIF形式データ | ![]() | 30.5 KB | 表示 | |
アーカイブディレクトリ | ![]() ![]() | HTTPS FTP |
-関連構造データ
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リンク
EMDBのページ | ![]() ![]() |
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マップ
ファイル | ![]() | ||||||||||||||||||||
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注釈 | Full map locally sharpened in phenix; classification and masked refinement over A-F hemichannel | ||||||||||||||||||||
ボクセルのサイズ | X=Y=Z: 0.835 Å | ||||||||||||||||||||
密度 |
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対称性 | 空間群: 1 | ||||||||||||||||||||
詳細 | EMDB XML:
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-添付データ
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試料の構成要素
-全体 : Connexin 26, 90mmHg PCO2, pH7.4, solubilised in LMNG.
全体 | 名称: Connexin 26, 90mmHg PCO2, pH7.4, solubilised in LMNG. |
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要素 |
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-超分子 #1: Connexin 26, 90mmHg PCO2, pH7.4, solubilised in LMNG.
超分子 | 名称: Connexin 26, 90mmHg PCO2, pH7.4, solubilised in LMNG. タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: #1 |
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由来(天然) | 生物種: ![]() |
-分子 #1: Gap junction beta-2 protein
分子 | 名称: Gap junction beta-2 protein / タイプ: protein_or_peptide / ID: 1 / 詳細: Connexin 26 subunit / コピー数: 12 / 光学異性体: LEVO |
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由来(天然) | 生物種: ![]() |
分子量 | 理論値: 26.713674 KDa |
組換発現 | 生物種: ![]() ![]() |
配列 | 文字列: MDWGTLQTIL GGVNKHSTSI GKIWLTVLFI FRIMILVVAA KEVWGDEQAD FVCNTLQPGC KNVCYDHYFP ISHIRLWALQ LIFVSTPAL LVAMHVAYRR HEKKRKFIKG EIKSEFKDIE EIKTQKVRIE GSLWWTYTSS IFFRVIFEAA FMYVFYVMYD G FSMQRLVK ...文字列: MDWGTLQTIL GGVNKHSTSI GKIWLTVLFI FRIMILVVAA KEVWGDEQAD FVCNTLQPGC KNVCYDHYFP ISHIRLWALQ LIFVSTPAL LVAMHVAYRR HEKKRKFIKG EIKSEFKDIE EIKTQKVRIE GSLWWTYTSS IFFRVIFEAA FMYVFYVMYD G FSMQRLVK CNAWPCPNTV DCFVSRPTEK TVFTVFMIAV SGICILLNVT ELCYLLIRYC SGKSKKPVLV PR UniProtKB: Gap junction beta-2 protein |
-分子 #2: PHOSPHATIDYLETHANOLAMINE
分子 | 名称: PHOSPHATIDYLETHANOLAMINE / タイプ: ligand / ID: 2 / コピー数: 24 / 式: PTY |
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分子量 | 理論値: 734.039 Da |
Chemical component information | ![]() ChemComp-PTY: |
-分子 #3: water
分子 | 名称: water / タイプ: ligand / ID: 3 / コピー数: 342 / 式: HOH |
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分子量 | 理論値: 18.015 Da |
Chemical component information | ![]() ChemComp-HOH: |
-実験情報
-構造解析
手法 | クライオ電子顕微鏡法 |
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![]() | 単粒子再構成法 |
試料の集合状態 | particle |
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試料調製
濃度 | 3.7 mg/mL | |||||||||||||||||||||||||||
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緩衝液 | pH: 7.4 構成要素:
詳細: The buffer, except LMNG and DTT, was prepared fresh from 10x stock on day of used. The basal buffer was filtered and degassed and DDM and DTT added. The buffer was pH corrected at point of ...詳細: The buffer, except LMNG and DTT, was prepared fresh from 10x stock on day of used. The basal buffer was filtered and degassed and DDM and DTT added. The buffer was pH corrected at point of use to pH 7.4 using 15% CO2 in 85% N2. | |||||||||||||||||||||||||||
グリッド | モデル: UltrAuFoil / 材質: GOLD / 前処理 - タイプ: GLOW DISCHARGE | |||||||||||||||||||||||||||
凍結 | 凍結剤: ETHANE-PROPANE / 装置: FEI VITROBOT MARK I 詳細: Blot 3 seconds, force 10, 1 blot, skip transfer. 3ul sample, in 15% CO2/85%N2 atmosphere. |
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電子顕微鏡法
顕微鏡 | FEI TITAN KRIOS |
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特殊光学系 | エネルギーフィルター - 名称: GIF Bioquantum |
撮影 | フィルム・検出器のモデル: GATAN K3 (6k x 4k) / 実像数: 11362 / 平均電子線量: 43.0 e/Å2 |
電子線 | 加速電圧: 300 kV / 電子線源: ![]() |
電子光学系 | 照射モード: FLOOD BEAM / 撮影モード: BRIGHT FIELD 最大 デフォーカス(公称値): 2.3000000000000003 µm 最小 デフォーカス(公称値): 0.8 µm / 倍率(公称値): 105000 |
試料ステージ | 試料ホルダーモデル: FEI TITAN KRIOS AUTOGRID HOLDER |
実験機器 | ![]() モデル: Titan Krios / 画像提供: FEI Company |