Biotechnology and Biological Sciences Research Council (BBSRC)
BB/P020208/1
United Kingdom
Biotechnology and Biological Sciences Research Council (BBSRC)
BB/P026397/1
United Kingdom
Wellcome Trust
108466/Z/15/Z
United Kingdom
Citation
Journal: Structure / Year: 2020 Title: Need for Speed: Examining Protein Behavior during CryoEM Grid Preparation at Different Timescales. Authors: David P Klebl / Molly S C Gravett / Dimitrios Kontziampasis / David J Wright / Robin S Bon / Diana C F Monteiro / Martin Trebbin / Frank Sobott / Howard D White / Michele C Darrow / Rebecca ...Authors: David P Klebl / Molly S C Gravett / Dimitrios Kontziampasis / David J Wright / Robin S Bon / Diana C F Monteiro / Martin Trebbin / Frank Sobott / Howard D White / Michele C Darrow / Rebecca F Thompson / Stephen P Muench / Abstract: A host of new technologies are under development to improve the quality and reproducibility of cryoelectron microscopy (cryoEM) grid preparation. Here we have systematically investigated the ...A host of new technologies are under development to improve the quality and reproducibility of cryoelectron microscopy (cryoEM) grid preparation. Here we have systematically investigated the preparation of three macromolecular complexes using three different vitrification devices (Vitrobot, chameleon, and a time-resolved cryoEM device) on various timescales, including grids made within 6 ms (the fastest reported to date), to interrogate particle behavior at the air-water interface for different timepoints. Results demonstrate that different macromolecular complexes can respond to the thin-film environment formed during cryoEM sample preparation in highly variable ways, shedding light on why cryoEM sample preparation can be difficult to optimize. We demonstrate that reducing time between sample application and vitrification is just one tool to improve cryoEM grid quality, but that it is unlikely to be a generic "silver bullet" for improving the quality of every cryoEM sample preparation.
History
Deposition
Apr 17, 2020
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Header (metadata) release
Aug 5, 2020
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Map release
Aug 5, 2020
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Update
May 19, 2021
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Current status
May 19, 2021
Processing site: PDBe / Status: Released
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Structure visualization
Movie
Surface view with section colored by density value
Cryogen name: ETHANE / Chamber humidity: 90 % / Chamber temperature: 278 K / Instrument: FEI VITROBOT MARK IV / Details: blot time 6 s blot force 6.
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Electron microscopy
Microscope
FEI TITAN KRIOS
Image recording
Film or detector model: FEI FALCON III (4k x 4k) / Detector mode: INTEGRATING / Average exposure time: 1.5 sec. / Average electron dose: 75.0 e/Å2
Electron beam
Acceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron optics
Illumination mode: SPOT SCAN / Imaging mode: BRIGHT FIELD
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
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Image processing
Final reconstruction
Applied symmetry - Point group: C7 (7 fold cyclic) / Resolution.type: BY AUTHOR / Resolution: 7.1 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION / Number images used: 41675
Initial angle assignment
Type: NOT APPLICABLE
Final angle assignment
Type: MAXIMUM LIKELIHOOD / Software - Name: RELION Details: The final angular assignment was done in a bigger, combined dataset which was then split into the original datasets to generate this reconstruction
FSC plot (resolution estimation)
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