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基本情報
登録情報 | データベース: PDB / ID: 6i9d | ||||||
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タイトル | MloK1 consensus structure from single particle analysis of 2D crystals | ||||||
![]() | Cyclic nucleotide-gated potassium channel mll3241 | ||||||
![]() | MEMBRANE PROTEIN / Voltage-gated potassium channel / Cyclic nucleotide-binding domain / ion channel / ion transport | ||||||
機能・相同性 | ![]() intracellularly cyclic nucleotide-activated monoatomic cation channel activity / potassium channel activity / cAMP binding / protein-containing complex binding / identical protein binding / plasma membrane 類似検索 - 分子機能 | ||||||
生物種 | Mesorhizobium japonicum | ||||||
手法 | 電子顕微鏡法 / 単粒子再構成法 / クライオ電子顕微鏡法 / 解像度: 4 Å | ||||||
![]() | Righetto, R. / Biyani, N. / Kowal, J. / Chami, M. / Stahlberg, H. | ||||||
資金援助 | ![]()
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![]() | ![]() タイトル: Retrieving high-resolution information from disordered 2D crystals by single-particle cryo-EM. 著者: Ricardo D Righetto / Nikhil Biyani / Julia Kowal / Mohamed Chami / Henning Stahlberg / ![]() 要旨: Electron crystallography can reveal the structure of membrane proteins within 2D crystals under close-to-native conditions. High-resolution structural information can only be reached if crystals are ...Electron crystallography can reveal the structure of membrane proteins within 2D crystals under close-to-native conditions. High-resolution structural information can only be reached if crystals are perfectly flat and highly ordered. In practice, such crystals are difficult to obtain. Available image unbending algorithms correct for disorder, but only perform well on images of non-tilted, flat crystals, while out-of-plane distortions are not addressed. Here, we present an approach that employs single-particle refinement procedures to locally unbend crystals in 3D. With this method, density maps of the MloK1 potassium channel with a resolution of 4 Å were obtained from images of 2D crystals that do not diffract beyond 10 Å. Furthermore, 3D classification allowed multiple structures to be resolved, revealing a series of MloK1 conformations within a single 2D crystal. This conformational heterogeneity explains the poor diffraction observed and is related to channel function. The approach is implemented in the FOCUS package. | ||||||
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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 | ![]() | 1.2 MB | 表示 | ![]() |
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文書・詳細版 | ![]() | 1.2 MB | 表示 | |
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-関連構造データ
関連構造データ | ![]() 4432MC ![]() 4439C ![]() 4441C ![]() 4513C ![]() 4514C ![]() 4515C ![]() 4516C ![]() 4517C ![]() 4518C ![]() 4519C ![]() 6iaxC ![]() 6qcyC ![]() 6qczC ![]() 6qd0C ![]() 6qd1C ![]() 6qd2C ![]() 6qd3C ![]() 6qd4C C: 同じ文献を引用 ( M: このデータのモデリングに利用したマップデータ |
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類似構造データ | |
電子顕微鏡画像生データ | ![]() Data size: 103.0 Data #1: Aligned averages of MloK1 2D crystals in the presence of cAMP [micrographs - single frame] Data #2: Particle stack from MloK1 2D crystals in the presence of cAMP [picked particles - single frame - unprocessed]) |
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リンク
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集合体
登録構造単位 | ![]()
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要素
#1: タンパク質 | 分子量: 37766.297 Da / 分子数: 4 / 由来タイプ: 組換発現 由来: (組換発現) ![]() 株: LMG 29417 / CECT 9101 / MAFF 303099 / 遺伝子: mll3241 / 発現宿主: ![]() ![]() #2: 化合物 | |
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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: 単粒子再構成法 |
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試料調製
構成要素 | 名称: MloK1 potassium channel in lipidic bilayer of 2D crystals タイプ: COMPLEX / Entity ID: #1 / 由来: RECOMBINANT |
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分子量 | 値: 0.16 MDa / 実験値: YES |
由来(天然) | 生物種: ![]() |
由来(組換発現) | 生物種: ![]() ![]() |
緩衝液 | pH: 7.6 詳細: 20 mM KCl, 20 mM Tris-HCl pH 7.6, 1 mM BaCl2, 1 mM EDTA, 0.2 mM cAMP |
試料 | 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES |
急速凍結 | 凍結剤: ETHANE |
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電子顕微鏡撮影
実験機器 | ![]() モデル: Titan Krios / 画像提供: FEI Company |
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顕微鏡 | モデル: FEI TITAN KRIOS |
電子銃 | 電子線源: ![]() |
電子レンズ | モード: BRIGHT FIELD / 倍率(公称値): 50000 X / 最大 デフォーカス(公称値): 4300 nm / 最小 デフォーカス(公称値): 750 nm / Cs: 2.7 mm |
試料ホルダ | 凍結剤: NITROGEN 試料ホルダーモデル: FEI TITAN KRIOS AUTOGRID HOLDER |
撮影 | 平均露光時間: 16 sec. / 電子線照射量: 45 e/Å2 / 検出モード: COUNTING フィルム・検出器のモデル: GATAN K2 SUMMIT (4k x 4k) 実像数: 270 詳細: The dataset of 346 movies recorded and processed for Kowal et al. (2018) 2 was employed. As reported, the data were collected on an FEI Titan Krios TEM equipped with a Gatan K2 DED. Total ...詳細: The dataset of 346 movies recorded and processed for Kowal et al. (2018) 2 was employed. As reported, the data were collected on an FEI Titan Krios TEM equipped with a Gatan K2 DED. Total dose: 40 e-/A^2 distributed over 40 movie frames. Pixel size: 1.3 A on the sample level (counting mode). Nominal tilt range: -55 to +55 degrees. |
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解析
EMソフトウェア |
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CTF補正 | 詳細: The defocus at the center of each particle box was estimated based on the tilt geometry. タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||||||||||
粒子像の選択 | 選択した粒子像数: 231688 詳細: The particle positions were given by the cross-correlation profile generated by the classical unbending algorithm. | ||||||||||||||||||||||||||||||||
対称性 | 点対称性: C4 (4回回転対称) | ||||||||||||||||||||||||||||||||
3次元再構成 | 解像度: 4 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 231688 / アルゴリズム: FOURIER SPACE 詳細: Angular assignments and x,y shifts were refined using a custom auto-refinement script written for FREALIGN v9.11. Maximum resolution used for refinement was 7.52 A. 対称性のタイプ: POINT | ||||||||||||||||||||||||||||||||
原子モデル構築 | プロトコル: FLEXIBLE FIT | ||||||||||||||||||||||||||||||||
原子モデル構築 | 3D fitting-ID: 1 / PDB chain-ID: A / Source name: PDB / タイプ: experimental model
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