ジャーナル: Nat Methods / 年: 2023 タイトル: ELI trifocal microscope: a precise system to prepare target cryo-lamellae for in situ cryo-ET study. 著者: Shuoguo Li / Ziyan Wang / Xing Jia / Tongxin Niu / Jianguo Zhang / Guoliang Yin / Xiaoyun Zhang / Yun Zhu / Gang Ji / Fei Sun / 要旨: Cryo-electron tomography (cryo-ET) has become a powerful approach to study the high-resolution structure of cellular macromolecular machines in situ. However, the current correlative cryo- ...Cryo-electron tomography (cryo-ET) has become a powerful approach to study the high-resolution structure of cellular macromolecular machines in situ. However, the current correlative cryo-fluorescence and electron microscopy lacks sufficient accuracy and efficiency to precisely prepare cryo-lamellae of target locations for subsequent cryo-ET. Here we describe a precise cryogenic fabrication system, ELI-TriScope, which sets electron (E), light (L) and ion (I) beams at the same focal point to achieve accurate and efficient preparation of a target cryo-lamella. ELI-TriScope uses a commercial dual-beam scanning electron microscope modified to incorporate a cryo-holder-based transfer system and embed an optical imaging system just underneath the vitrified specimen. Cryo-focused ion beam milling can be accurately navigated by monitoring the real-time fluorescence signal of the target molecule. Using ELI-TriScope, we prepared a batch of cryo-lamellae of HeLa cells targeting the centrosome with a success rate of ~91% and discovered new in situ structural features of the human centrosome by cryo-ET.
全体 : gamma-tubulin ring complex in human centrosomes of HCT116 and HeL...
全体
名称: gamma-tubulin ring complex in human centrosomes of HCT116 and HeLa cells
要素
細胞: gamma-tubulin ring complex in human centrosomes of HCT116 and HeLa cells
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超分子 #1: gamma-tubulin ring complex in human centrosomes of HCT116 and HeL...
超分子
名称: gamma-tubulin ring complex in human centrosomes of HCT116 and HeLa cells タイプ: cell / ID: 1 / 親要素: 0 詳細: Data from HeLa cells were obtained from EMPIARC-200003 dataset of human centrosomes
由来(天然)
生物種: Homo sapiens (ヒト) / 株: HCT116 & HeLa
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実験情報
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構造解析
手法
クライオ電子顕微鏡法
解析
サブトモグラム平均法
試料の集合状態
cell
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試料調製
緩衝液
pH: 7
凍結
凍結剤: ETHANE
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電子顕微鏡法
顕微鏡
TFS KRIOS
撮影
フィルム・検出器のモデル: GATAN K3 BIOQUANTUM (6k x 4k) 平均電子線量: 3.3 e/Å2