negative regulation of Arp2/3 complex-mediated actin nucleation / fructose-bisphosphate aldolase / fructose-bisphosphate aldolase activity / M band / I band / glycolytic process / protein homotetramerization / positive regulation of cell migration 類似検索 - 分子機能
Fructose-bisphosphate aldolase class-I active site / Fructose-bisphosphate aldolase class-I active site. / Fructose-bisphosphate aldolase, class-I / Fructose-bisphosphate aldolase class-I / Aldolase-type TIM barrel 類似検索 - ドメイン・相同性
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: 100 % / チャンバー内温度: 277.15 K / 装置: HOMEMADE PLUNGER 詳細: 3 microliters of purified aldolase was applied to grids and manually blotted for four to five seconds using Whatman No. 1 filter paper. Blot time counting commenced once the blotted sample on ...詳細: 3 microliters of purified aldolase was applied to grids and manually blotted for four to five seconds using Whatman No. 1 filter paper. Blot time counting commenced once the blotted sample on the filter paper stopped spreading, monitored visually using a lamp positioned behind the sample. At the end of 4-5 s, the blotting paper was pulled back and immediately plunged into a well of liquid ethane cooled by liquid nitrogen..
詳細
Lyophillized rabbit muscle aldolase was purchased (Sigma Aldrich) and solubilized in 20 mM HEPES (pH 7.5), 50 mM NaCl at ~3 mg/ml. Aldolase was loaded onto a using a Sepharose 6 10/300 (GE Healthcare) column equilibrated in the solubilization buffer, and fractions corresponding to apoferritin were pooled and concentrated to 1.6 mg/ml.
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
Alpine detector
粒子像選択
選択した数: 1914721 / 詳細: template-based picking in cryoSPARC
初期モデル
モデルのタイプ: NONE
最終 再構成
想定した対称性 - 点群: D2 (2回x2回 2面回転対称) アルゴリズム: BACK PROJECTION / 解像度のタイプ: BY AUTHOR / 解像度: 3.1 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: Per-particle defocus, beam tilt, and trefoil aberration estimation were performed in RELION, and 3D auto-refinement with D2 symmetry and CTF refinement including 4th-order (symmetrical) aberration correction 使用した粒子像数: 674124