- EMDB-43527: Apoferritin at 100 keV on Alpine detector with a side-entry cryoholder -
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基本情報
登録情報
データベース: EMDB / ID: EMD-43527
タイトル
Apoferritin at 100 keV on Alpine detector with a side-entry cryoholder
マップデータ
mouse apoferritin determined at 100 keV on a Talos 200C with a Gatan Alpine camera using a Gatan 626 side-entry cryoholder
試料
複合体: Heavy chain apoferritin from mouse
タンパク質・ペプチド: Heavy chain apoferritin from mouse
キーワード
Protein complex / TRANSPORT PROTEIN
機能・相同性
機能・相同性情報
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
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
GM14305
米国
引用
ジャーナル: J Struct Biol / 年: 2024 タイトル: High-resolution single-particle imaging at 100-200 keV with the Gatan Alpine direct electron detector. 著者: Lieza M Chan / Brandon J Courteau / Allison Maker / Mengyu Wu / Benjamin Basanta / Hev Mehmood / David Bulkley / David Joyce / Brian C Lee / Stephen Mick / Cory Czarnik / Sahil Gulati / ...著者: Lieza M Chan / Brandon J Courteau / Allison Maker / Mengyu Wu / Benjamin Basanta / Hev Mehmood / David Bulkley / David Joyce / Brian C Lee / Stephen Mick / Cory Czarnik / Sahil Gulati / Gabriel C Lander / Kliment A Verba / 要旨: Developments in direct electron detector technology have played a pivotal role in enabling high-resolution structural studies by cryo-EM at 200 and 300 keV. Yet, theory and recent experiments ...Developments in direct electron detector technology have played a pivotal role in enabling high-resolution structural studies by cryo-EM at 200 and 300 keV. Yet, theory and recent experiments indicate advantages to imaging at 100 keV, energies for which the current detectors have not been optimized. In this study, we evaluated the Gatan Alpine detector, designed for operation at 100 and 200 keV. Compared to the Gatan K3, Alpine demonstrated a significant DQE improvement at these energies, specifically a ∼ 4-fold improvement at Nyquist at 100 keV. In single-particle cryo-EM experiments, Alpine datasets yielded better than 2 Å resolution reconstructions of apoferritin at 120 and 200 keV on a ThermoFisher Scientific (TFS) Glacios microscope fitted with a non-standard SP-Twin lens. We also achieved a ∼ 3.2 Å resolution reconstruction of a 115 kDa asymmetric protein complex, proving Alpine's effectiveness with complex biological samples. In-depth analysis revealed that Alpine reconstructions are comparable to K3 reconstructions at 200 keV, and remarkably, reconstruction from Alpine at 120 keV on a TFS Glacios surpassed all but the 300 keV data from a TFS Titan Krios with GIF/K3. Additionally, we show Alpine's capability for high-resolution data acquisition and screening on lower-end systems by obtaining ∼ 3 Å resolution reconstructions of apoferritin and aldolase at 100 keV and detailed 2D averages of a 55 kDa sample using a side-entry cryo holder. Overall, we show that Gatan Alpine performs well with the standard 200 keV imaging systems and may potentially capture the benefits of lower accelerating voltages, bringing smaller sized particles within the scope of cryo-EM.
凍結剤: ETHANE / チャンバー内湿度: 95 % / チャンバー内温度: 277.15 K / 装置: HOMEMADE PLUNGER 詳細: 3 uL of sample/grid was manually blotted for 4 seconds prior to immediate plunge-freezing in liquid nitrogen-cooled ethane.
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電子顕微鏡法
顕微鏡
TFS TALOS F200C
温度
最低: 64.0 K / 最高: 70.0 K
詳細
Grids loaded into Talos F200C with a Gatan 626 side-entry cryoholder
撮影
フィルム・検出器のモデル: OTHER / デジタル化 - サイズ - 横: 2304 pixel / デジタル化 - サイズ - 縦: 3240 pixel / 撮影したグリッド数: 1 / 実像数: 318 / 平均露光時間: 20.0 sec. / 平均電子線量: 195.0 e/Å2 詳細: 318 movies were acquired in super resolution CDS mode with an exposure rate of 7.1 EPS, for a total of 20 sec (100 ms per frame, 200 frames)
試料ホルダーモデル: GATAN 626 SINGLE TILT LIQUID NITROGEN CRYO TRANSFER HOLDER ホルダー冷却材: NITROGEN
実験機器
モデル: Tecnai F20 / 画像提供: FEI Company
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画像解析
詳細
Gatan Alpine Detector
粒子像選択
選択した数: 82977 詳細: Particles were picked in cryoSPARC using scaled templates of apoferritin from a previously acquired dataset
初期モデル
モデルのタイプ: NONE / 詳細: cryoSPARC ab initio
最終 再構成
想定した対称性 - 点群: O (正8面体型対称) / アルゴリズム: BACK PROJECTION / 解像度のタイプ: BY AUTHOR / 解像度: 2.6 Å / 解像度の算出法: FSC 0.143 CUT-OFF / ソフトウェア - 名称: RELION (ver. 3.1) 詳細: Stack was imported into RELION 3.1 and particles were sorted into optics groups according to beam-image shift parameters stored in the Leginon database. Per-particle defocus, beam tilt, and ...詳細: Stack was imported into RELION 3.1 and particles were sorted into optics groups according to beam-image shift parameters stored in the Leginon database. Per-particle defocus, beam tilt, and trefoil aberration estimation were subsequently performed. 使用した粒子像数: 51253