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基本情報
登録情報 | データベース: PDB / ID: 3j1z | ||||||
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タイトル | Inward-Facing Conformation of the Zinc Transporter YiiP revealed by Cryo-electron Microscopy | ||||||
![]() | Cation efflux family protein | ||||||
![]() | METAL TRANSPORT / zinc transporter / secondary transporter / alternating access mechanism / Structural Genomics / PSI-Biology / Transcontinental EM Initiative for Membrane Protein Structure / TEMIMPS | ||||||
機能・相同性 | ![]() zinc efflux antiporter activity / cadmium ion transmembrane transporter activity / ferrous iron transmembrane transporter activity / intracellular zinc ion homeostasis / metal ion binding / plasma membrane 類似検索 - 分子機能 | ||||||
生物種 | ![]() | ||||||
手法 | 電子顕微鏡法 / らせん対称体再構成法 / クライオ電子顕微鏡法 / 解像度: 13 Å | ||||||
![]() | Coudray, N. / Valvo, S. / Hu, M. / Lasala, R. / Kim, C. / Vink, M. / Zhou, M. / Provasi, D. / Filizola, M. / Tao, J. ...Coudray, N. / Valvo, S. / Hu, M. / Lasala, R. / Kim, C. / Vink, M. / Zhou, M. / Provasi, D. / Filizola, M. / Tao, J. / Fang, J. / Penczek, P.A. / Ubarretxena-Belandia, I. / Stokes, D.L. / Transcontinental EM Initiative for Membrane Protein Structure (TEMIMPS) | ||||||
![]() | ![]() タイトル: Inward-facing conformation of the zinc transporter YiiP revealed by cryoelectron microscopy. 著者: Nicolas Coudray / Salvatore Valvo / Minghui Hu / Ralph Lasala / Changki Kim / Martin Vink / Ming Zhou / Davide Provasi / Marta Filizola / Juoehi Tao / Jia Fang / Pawel A Penczek / Iban ...著者: Nicolas Coudray / Salvatore Valvo / Minghui Hu / Ralph Lasala / Changki Kim / Martin Vink / Ming Zhou / Davide Provasi / Marta Filizola / Juoehi Tao / Jia Fang / Pawel A Penczek / Iban Ubarretxena-Belandia / David L Stokes / ![]() 要旨: YiiP is a dimeric Zn(2+)/H(+) antiporter from Escherichia coli belonging to the cation diffusion facilitator family. We used cryoelectron microscopy to determine a 13-Å resolution structure of a ...YiiP is a dimeric Zn(2+)/H(+) antiporter from Escherichia coli belonging to the cation diffusion facilitator family. We used cryoelectron microscopy to determine a 13-Å resolution structure of a YiiP homolog from Shewanella oneidensis within a lipid bilayer in the absence of Zn(2+). Starting from the X-ray structure in the presence of Zn(2+), we used molecular dynamics flexible fitting to build a model consistent with our map. Comparison of the structures suggests a conformational change that involves pivoting of a transmembrane, four-helix bundle (M1, M2, M4, and M5) relative to the M3-M6 helix pair. Although accessibility of transport sites in the X-ray model indicates that it represents an outward-facing state, our model is consistent with an inward-facing state, suggesting that the conformational change is relevant to the alternating access mechanism for transport. Molecular dynamics simulation of YiiP in a lipid environment was used to address the feasibility of this conformational change. Association of the C-terminal domains is the same in both states, and we speculate that this association is responsible for stabilizing the dimer that, in turn, may coordinate the rearrangement of the transmembrane helices. | ||||||
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構造の表示
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構造ビューア | 分子: ![]() ![]() |
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-検証レポート
文書・要旨 | ![]() | 602.3 KB | 表示 | ![]() |
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文書・詳細版 | ![]() | 608 KB | 表示 | |
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-関連構造データ
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リンク
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集合体
登録構造単位 | ![]()
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対称性 | らせん対称: (回転対称性: 3 / Dyad axis: no / N subunits divisor: 1 / Num. of operations: 18 / Rise per n subunits: 17.1 Å / Rotation per n subunits: 56.4 °) |
詳細 | THE SYMMETRY OF THE HELIX IS D3. |
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要素
#1: タンパク質 | 分子量: 33866.660 Da / 分子数: 2 / 由来タイプ: 組換発現 由来: (組換発現) ![]() 株: MR-1 / 遺伝子: SO_4475 / 発現宿主: ![]() ![]() |
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-実験情報
-実験
実験 | 手法: 電子顕微鏡法 |
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EM実験 | 試料の集合状態: 2D ARRAY / 3次元再構成法: らせん対称体再構成法 |
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試料調製
構成要素 | 名称: YiiP from Shewanella oneidensis in DOPG lipids / タイプ: COMPLEX |
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緩衝液 | 名称: 20mM TES, 5mM MgCl2, 100mM NaCl, 5mM NaN3 / pH: 7 / 詳細: 20mM TES, 5mM MgCl2, 100mM NaCl, 5mM NaN3 |
試料 | 濃度: 0.5 mg/ml / 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES |
試料支持 | 詳細: holey carbon grid |
急速凍結 | 装置: GATAN CRYOPLUNGE 3 / 凍結剤: ETHANE / Temp: 100 K 詳細: Blot for 2-5 seconds before plunging into liquid ethane (Gatan cryoplunger) 手法: Blot for 2-5 seconds before plunging |
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電子顕微鏡撮影
実験機器 | ![]() モデル: Tecnai F20 / 画像提供: FEI Company |
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顕微鏡 | モデル: FEI TECNAI F20 / 日付: 2009年2月10日 |
電子銃 | 電子線源: ![]() |
電子レンズ | モード: BRIGHT FIELD / 倍率(公称値): 50000 X / 倍率(補正後): 51190 X / 最大 デフォーカス(公称値): 3000 nm / 最小 デフォーカス(公称値): 1600 nm / Cs: 2.1 mm |
試料ホルダ | 温度: 100 K |
撮影 | 電子線照射量: 10 e/Å2 / フィルム・検出器のモデル: GENERIC FILM / 詳細: Kodak SO163 film |
画像スキャン | デジタル画像の数: 19 |
放射 | プロトコル: SINGLE WAVELENGTH / 単色(M)・ラウエ(L): M / 散乱光タイプ: x-ray |
放射波長 | 相対比: 1 |
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解析
EMソフトウェア |
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CTF補正 | 詳細: Corrected throughout the reconstruction cycle | ||||||||||||
らせん対称 | 回転角度/サブユニット: 56.4 ° / 軸方向距離/サブユニット: 17.1 Å / らせん対称軸の対称性: D3 | ||||||||||||
3次元再構成 | 手法: IHRSR / 解像度: 13 Å / ピクセルサイズ(実測値): 2.735 Å 詳細: CRYSTAL CELL PARAMETERS WERE A=57.5, B=34.0, C=100.0, ALPHA=90, BETA=90, GAMMA=85.3. 対称性のタイプ: HELICAL | ||||||||||||
原子モデル構築 | プロトコル: FLEXIBLE FIT / 空間: REAL 詳細: METHOD--MDFF DETAILS--An initial homology model of YiiP from S. oneidensis was built with MODELLER 9v7 using the X-ray crystal structure of YiiP from E. coli (PDB entry 3H90) as a template. ...詳細: METHOD--MDFF DETAILS--An initial homology model of YiiP from S. oneidensis was built with MODELLER 9v7 using the X-ray crystal structure of YiiP from E. coli (PDB entry 3H90) as a template. This model included 9 residues at the N-terminus and 4 residues at the C-terminus that were not present in the X-ray structure. Initial configurations were obtained by manually placing the symmetry axis of the homology model onto the symmetry axis of the electron density map and aligning the protein C-terminal domains to the corresponding densities. In the first step of the MDFF fitting, harmonic potentials were applied to (a) the four-helix bundle formed by helices M1, M2, M4, and M5 (residues 12-32, 42-65, 119-142, and 147-165, respectively), (b) the M3 and M6 helices at the dimeric interface (residues 78-108 and 179-211, respectively), and (c) the C-terminal intracellular domain (residues 212-297). | ||||||||||||
原子モデル構築 | PDB-ID: 3H90 Accession code: 3H90 / Source name: PDB / タイプ: experimental model | ||||||||||||
精密化ステップ | サイクル: LAST
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