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基本情報
登録情報 | データベース: PDB / ID: 7kod | |||||||||||||||||||||
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タイトル | Cryo-EM structure of heavy chain mouse apoferritin | |||||||||||||||||||||
![]() | Ferritin heavy chain | |||||||||||||||||||||
![]() | OXIDOREDUCTASE / protein | |||||||||||||||||||||
機能・相同性 | ![]() Iron uptake and transport / Golgi Associated Vesicle Biogenesis / iron ion sequestering activity / negative regulation of ferroptosis / ferroxidase / autolysosome / ferroxidase activity / negative regulation of fibroblast proliferation / Neutrophil degranulation / endocytic vesicle lumen ...Iron uptake and transport / Golgi Associated Vesicle Biogenesis / iron ion sequestering activity / negative regulation of ferroptosis / ferroxidase / autolysosome / ferroxidase activity / negative regulation of fibroblast proliferation / Neutrophil degranulation / endocytic vesicle lumen / ferric iron binding / autophagosome / ferrous iron binding / iron ion transport / intracellular iron ion homeostasis / immune response / iron ion binding / negative regulation of cell population proliferation / mitochondrion / extracellular region / identical protein binding / membrane / cytosol 類似検索 - 分子機能 | |||||||||||||||||||||
生物種 | ![]() ![]() | |||||||||||||||||||||
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: 1.655 Å | |||||||||||||||||||||
![]() | Sun, M. / Azumaya, C. / Tse, E. / Frost, A. / Southworth, D. / Verba, K.A. / Cheng, Y. / Agard, D.A. | |||||||||||||||||||||
資金援助 | ![]()
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![]() | ![]() タイトル: Practical considerations for using K3 cameras in CDS mode for high-resolution and high-throughput single particle cryo-EM. 著者: Ming Sun / Caleigh M Azumaya / Eric Tse / David P Bulkley / Matthew B Harrington / Glenn Gilbert / Adam Frost / Daniel Southworth / Kliment A Verba / Yifan Cheng / David A Agard / ![]() 要旨: Detector technology plays a pivotal role in high-resolution and high-throughput cryo-EM structure determination. Compared with the first-generation, single-electron counting direct detection camera ...Detector technology plays a pivotal role in high-resolution and high-throughput cryo-EM structure determination. Compared with the first-generation, single-electron counting direct detection camera (Gatan K2), the latest K3 camera is faster, larger, and now offers a correlated-double sampling mode (CDS). Importantly this results in a higher DQE and improved throughput compared to its predecessor. In this study, we focused on optimizing camera data collection parameters for daily use within a cryo-EM facility and explored the balance between throughput and resolution. In total, eight data sets of murine heavy-chain apoferritin were collected at different dose rates and magnifications, using 9-hole image shift data collection strategies. The performance of the camera was characterized by the quality of the resultant 3D reconstructions. Our results demonstrated that the Gatan K3 operating in CDS mode outperformed standard (nonCDS) mode in terms of reconstruction resolution in all tested conditions with 8 electrons per pixel per second being the optimal dose rate. At low magnification (64kx) we were able to achieve reconstruction resolutions of 149% of the physical Nyquist limit (1.8 Å with a 1.346 Å physical pixel size). Low magnification allows more particles to be collected per image, aiding analysis of heterogeneous samples requiring large data sets. At moderate magnification (105kx, 0.834 Å physical pixel size) we achieved a resolution of 1.65 Å within 8-h of data collection, a condition optimal for achieving high-resolution on well behaved samples. Our results also show that for an optimal sample like apoferritin, one can achieve better than 2.5 Å resolution with 5 min of data collection. Together, our studies validate the most efficient ways of imaging protein complexes using the K3 direct detector and will greatly benefit the cryo-EM community. | |||||||||||||||||||||
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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 | ![]() | 902.6 KB | 表示 | ![]() |
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文書・詳細版 | ![]() | 907.1 KB | 表示 | |
XML形式データ | ![]() | 96.3 KB | 表示 | |
CIF形式データ | ![]() | 150.7 KB | 表示 | |
アーカイブディレクトリ | ![]() ![]() | HTTPS FTP |
-関連構造データ
関連構造データ | ![]() 22972MC M: このデータのモデリングに利用したマップデータ C: 同じ文献を引用 ( |
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類似構造データ | |
電子顕微鏡画像生データ | ![]() Data size: 8.5 TB Data #1: apoferritin multi-frame raw micrographs non gain normalized frames in LZW compressed TIFF format collected at 8 e/p/s in CDS mode from Gatan K3 [micrographs - multiframe] Data #2: apoferritin multi-frame raw micrographs non gain normalized frames in LZW compressed TIFF format collected at 8 e/p/s in standard mode from Gatan K3 [micrographs - multiframe] Data #3: apoferritin multi-frame raw micrographs non gain normalized frames in LZW compressed TIFF format collected at 4 e/p/s in CDS mode from Gatan K3 [micrographs - multiframe] Data #4: apoferritin multi-frame raw micrographs non gain normalized frames in LZW compressed TIFF format collected at 4 e/p/s in CDS mode from Gatan K3 [micrographs - multiframe] Data #5: apoferritin multi-frame raw micrographs non gain normalized frames in LZW compressed TIFF format collected at 8 e/p/s in CDS mode from Gatan K3 at lower magnification [micrographs - multiframe] Data #6: apoferritin multi-frame raw micrographs non gain normalized frames in LZW compressed TIFF format collected at 8 e/p/s in standard mode from Gatan K3 at lower magnification [micrographs - multiframe] Data #7: apoferritin multi-frame raw micrographs non gain normalized frames in LZW compressed TIFF format collected at 16 e/p/s in CDS mode from Gatan K3 at lower magnification [micrographs - multiframe] Data #8: apoferritin multi-frame raw micrographs non gain normalized frames in LZW compressed TIFF format collected at 16 e/p/s in standard mode from Gatan K3 at lower magnification [micrographs - multiframe]) |
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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: 21097.631 Da / 分子数: 24 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() ![]() ![]() #2: 水 | ChemComp-HOH / | |
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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: PARTICLE / 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: Heavy chain mouse apoferritin / タイプ: COMPLEX / Entity ID: #1 / 由来: RECOMBINANT |
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分子量 | 実験値: NO |
由来(天然) | 生物種: ![]() ![]() |
由来(組換発現) | 生物種: ![]() ![]() |
緩衝液 | pH: 7.5 |
試料 | 包埋: NO / 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: COPPER / グリッドのサイズ: 300 divisions/in. / グリッドのタイプ: Quantifoil |
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 |
試料ホルダ | 試料ホルダーモデル: FEI TITAN KRIOS AUTOGRID HOLDER |
撮影 | 平均露光時間: 6 sec. / 電子線照射量: 69 e/Å2 フィルム・検出器のモデル: GATAN K3 BIOQUANTUM (6k x 4k) 撮影したグリッド数: 1 / 詳細: 9-hole image-shift data collection strategy |
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解析
ソフトウェア | 名称: PHENIX / バージョン: 1.18.2_3874: / 分類: 精密化 | ||||||||||||||||||||||||||||||||||||||||||||
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EMソフトウェア |
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CTF補正 | タイプ: NONE | ||||||||||||||||||||||||||||||||||||||||||||
対称性 | 点対称性: O (正8面体型対称) | ||||||||||||||||||||||||||||||||||||||||||||
3次元再構成 | 解像度: 1.655 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 571000 / 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 | PDB-ID: 5OBA Accession code: 5OBA / Source name: PDB / タイプ: experimental model | ||||||||||||||||||||||||||||||||||||||||||||
精密化 | 交差検証法: NONE 立体化学のターゲット値: GeoStd + Monomer Library + CDL v1.2 | ||||||||||||||||||||||||||||||||||||||||||||
原子変位パラメータ | Biso mean: 21.44 Å2 | ||||||||||||||||||||||||||||||||||||||||||||
拘束条件 |
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