ジャーナル: J Vis Exp / 年: 2017 タイトル: High-resolution Single Particle Analysis from Electron Cryo-microscopy Images Using SPHIRE. 著者: Toshio Moriya / Michael Saur / Markus Stabrin / Felipe Merino / Horatiu Voicu / Zhong Huang / Pawel A Penczek / Stefan Raunser / Christos Gatsogiannis / 要旨: SPHIRE (SPARX for High-Resolution Electron Microscopy) is a novel open-source, user-friendly software suite for the semi-automated processing of single particle electron cryo-microscopy (cryo-EM) ...SPHIRE (SPARX for High-Resolution Electron Microscopy) is a novel open-source, user-friendly software suite for the semi-automated processing of single particle electron cryo-microscopy (cryo-EM) data. The protocol presented here describes in detail how to obtain a near-atomic resolution structure starting from cryo-EM micrograph movies by guiding users through all steps of the single particle structure determination pipeline. These steps are controlled from the new SPHIRE graphical user interface and require minimum user intervention. Using this protocol, a 3.5 Å structure of TcdA1, a Tc toxin complex from Photorhabdus luminescens, was derived from only 9500 single particles. This streamlined approach will help novice users without extensive processing experience and a priori structural information, to obtain noise-free and unbiased atomic models of their purified macromolecular complexes in their native state.
EMPIAR-10089 (タイトル: Single Particle cryoEM Dataset of TcdA1 in prepore state (SPHIRE tutorial) Data size: 72.8 Data #1: Unaligned multi-frame micrographs of TcdA1 in prepore state (SPHIRE tutorial dataset) [micrographs - multiframe])
フィルム・検出器のモデル: FEI FALCON II (4k x 4k) 実像数: 112 / 平均電子線量: 2.5 e/Å2
電子線
加速電圧: 300 kV / 電子線源: FIELD EMISSION GUN
電子光学系
照射モード: OTHER / 撮影モード: BRIGHT FIELD / 倍率(公称値): 59000
試料ステージ
ホルダー冷却材: NITROGEN
実験機器
モデル: Titan Krios / 画像提供: FEI Company
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画像解析
粒子像選択
選択した数: 8416
CTF補正
ソフトウェア - 名称: SPHIRE
初期モデル
モデルのタイプ: OTHER 詳細: initial model was obtained using VIPER (SPHIRE) from 2D class averages
最終 再構成
想定した対称性 - 点群: C5 (5回回転対称) / 解像度のタイプ: BY AUTHOR / 解像度: 3.5 Å / 解像度の算出法: FSC 0.143 CUT-OFF / ソフトウェア - 名称: SPHIRE 詳細: The density was filtered to its local resolution, using localfilt (SPHIRE) 使用した粒子像数: 4943