+データを開く
-基本情報
登録情報 | データベース: PDB / ID: 3iz2 | ||||||
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タイトル | C-alpha model fitted into the EM structure of Cx26M34Adel2-7 | ||||||
要素 | Gap junction beta-2 protein | ||||||
キーワード | MEMBRANE PROTEIN / Gap Junction channel | ||||||
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 / gap junction channel activity involved in cell communication by electrical coupling / epididymis development / 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 / gap junction channel activity involved in cell communication by electrical coupling / epididymis development / Oligomerization of connexins into connexons / Transport of connexins along the secretory pathway / gap junction assembly / connexin complex / gap junction / astrocyte projection / Gap junction assembly / gap junction channel activity / endoplasmic reticulum-Golgi intermediate compartment / inner ear development / decidualization / lateral plasma membrane / response to retinoic acid / cellular response to glucagon stimulus / cellular response to dexamethasone stimulus / response to ischemia / response to progesterone / sensory perception of sound / transmembrane transport / cell-cell signaling / response to estradiol / 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 | ||||||
生物種 | Homo sapiens (ヒト) | ||||||
手法 | 電子線結晶学 / クライオ電子顕微鏡法 / 解像度: 10 Å | ||||||
データ登録者 | Oshima, A. / Tani, K. / Toloue, M.M. / Hiroaki, Y. / Smock, A. / Inukai, S. / Cone, A. / Nicholson, B.J. / Sosinsky, G.E. / Fujiyoshi, Y. | ||||||
引用 | ジャーナル: J Mol Biol / 年: 2011 タイトル: Asymmetric configurations and N-terminal rearrangements in connexin26 gap junction channels. 著者: Atsunori Oshima / Kazutoshi Tani / Masoud M Toloue / Yoko Hiroaki / Amy Smock / Sayaka Inukai / Angela Cone / Bruce J Nicholson / Gina E Sosinsky / Yoshinori Fujiyoshi / 要旨: Gap junction channels are unique in that they possess multiple mechanisms for channel closure, several of which involve the N terminus as a key component in gating, and possibly assembly. Here, we ...Gap junction channels are unique in that they possess multiple mechanisms for channel closure, several of which involve the N terminus as a key component in gating, and possibly assembly. Here, we present electron crystallographic structures of a mutant human connexin26 (Cx26M34A) and an N-terminal deletion of this mutant (Cx26M34Adel2-7) at 6-Å and 10-Å resolutions, respectively. The three-dimensional map of Cx26M34A was improved by data from 60° tilt images and revealed a breakdown of the hexagonal symmetry in a connexin hemichannel, particularly in the cytoplasmic domain regions at the ends of the transmembrane helices. The Cx26M34A structure contained an asymmetric density in the channel vestibule ("plug") that was decreased in the Cx26M34Adel2-7 structure, indicating that the N terminus significantly contributes to form this plug feature. Functional analysis of the Cx26M34A channels revealed that these channels are predominantly closed, with the residual electrical conductance showing normal voltage gating. N-terminal deletion mutants with and without the M34A mutation showed no electrical activity in paired Xenopus oocytes and significantly decreased dye permeability in HeLa cells. Comparing this closed structure with the recently published X-ray structure of wild-type Cx26, which is proposed to be in an open state, revealed a radial outward shift in the transmembrane helices in the closed state, presumably to accommodate the N-terminal plug occluding the pore. Because both Cx26del2-7 and Cx26M34Adel2-7 channels are closed, the N terminus appears to have a prominent role in stabilizing the open configuration. | ||||||
履歴 |
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-構造の表示
ムービー |
ムービービューア |
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構造ビューア | 分子: MolmilJmol/JSmol |
-ダウンロードとリンク
-ダウンロード
PDBx/mmCIF形式 | 3iz2.cif.gz | 31.4 KB | 表示 | PDBx/mmCIF形式 |
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PDB形式 | pdb3iz2.ent.gz | 16.4 KB | 表示 | PDB形式 |
PDBx/mmJSON形式 | 3iz2.json.gz | ツリー表示 | PDBx/mmJSON形式 | |
その他 | その他のダウンロード |
-検証レポート
文書・要旨 | 3iz2_validation.pdf.gz | 685.9 KB | 表示 | wwPDB検証レポート |
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文書・詳細版 | 3iz2_full_validation.pdf.gz | 685.4 KB | 表示 | |
XML形式データ | 3iz2_validation.xml.gz | 11.4 KB | 表示 | |
CIF形式データ | 3iz2_validation.cif.gz | 16.6 KB | 表示 | |
アーカイブディレクトリ | https://data.pdbj.org/pub/pdb/validation_reports/iz/3iz2 ftp://data.pdbj.org/pub/pdb/validation_reports/iz/3iz2 | HTTPS FTP |
-関連構造データ
-リンク
-集合体
登録構造単位 |
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単位格子 |
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-要素
#1: タンパク質 | 分子量: 26985.943 Da / 分子数: 3 / 変異: M34A / 由来タイプ: 組換発現 / 由来: (組換発現) Homo sapiens (ヒト) / 遺伝子: GJB2 / プラスミド: pBlueBac4.5 発現宿主: Spodoptera frugiperda (ツマジロクサヨトウ) 参照: UniProt: P29033 |
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-実験情報
-実験
実験 | 手法: 電子線結晶学 |
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EM実験 | 試料の集合状態: 2D ARRAY / 3次元再構成法: 電子線結晶学 |
-試料調製
構成要素 | 名称: connexin26 gap junction channels / タイプ: COMPLEX |
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緩衝液 | 名称: 10mM MES / pH: 5.8 詳細: 10% trehalose (Sigma, St. Louis, MO), 10 mM MES (pH 5.8), 300 mM NaCl, 50 mM MgCl2, 5 mM CaCl2, 2 mM dithiothreitol, 100 microM carbenoxolone, 0.005% NaN3, and 1% glycerol10mM MES |
試料 | 濃度: 2 mg/ml / 包埋: YES / シャドウイング: NO / 染色: NO / 凍結: YES |
試料支持 | グリッドの材料: MOLYBDENUM |
EM embedding | 詳細: 10% trehalose / Material: trehalose |
急速凍結 | 装置: REICHERT-JUNG PLUNGER / 凍結剤: NITROGEN / Temp: 93 K 手法: The grids were blotted with filter paper and fast frozen into liquid nitrogen |
-データ収集
顕微鏡 | モデル: JEOL KYOTO-3000SFF / 日付: 2007年11月9日 |
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電子銃 | 電子線源: FIELD EMISSION GUN / 加速電圧: 300 kV / 照射モード: FLOOD BEAM |
電子レンズ | モード: BRIGHT FIELD / 倍率(公称値): 40000 X / 倍率(補正後): 39000 X / 最大 デフォーカス(公称値): 2214 nm / 最小 デフォーカス(公称値): 544 nm / Cs: 1.6 mm |
試料ホルダ | 温度: 4.2 K / 傾斜角・最大: 45 ° / 傾斜角・最小: 0 ° |
撮影 | 電子線照射量: 25 e/Å2 / フィルム・検出器のモデル: KODAK SO-163 FILM |
放射 | プロトコル: SINGLE WAVELENGTH / 単色(M)・ラウエ(L): M / 散乱光タイプ: electron |
放射波長 | 相対比: 1 |
-解析
EMソフトウェア |
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CTF補正 | 詳細: Each image | ||||||||||||
3次元再構成 | 手法: Lattice line fitting / 解像度: 10 Å / 倍率補正: carbon grating / 対称性のタイプ: 2D CRYSTAL | ||||||||||||
原子モデル構築 | プロトコル: RIGID BODY FIT / 空間: REAL / Target criteria: Cross-correlation coefficient 詳細: REFINEMENT PROTOCOL--Rigid body DETAILS--Initial local fitting was done using O, and Situs was used for flexible fitting. | ||||||||||||
原子モデル構築 | PDB-ID: 2ZW3 Accession code: 2ZW3 / Source name: PDB / タイプ: experimental model | ||||||||||||
精密化ステップ | サイクル: LAST
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