EMPIAR-10421
Single-Particle CryoEM of Human Apoferritin Light Chain Vitrified Using Back-it-up [multiple data sets in MRCS and MRC formats]
Publication:

Through-grid wicking enables high-speed cryoEM specimen preparation

Tan YZ, Rubinstein JL

bioRxiv (2020)

Related EMDB entry:
Deposited:
2020-05-13
Released:
2021-05-17
Last modified:
2021-05-17
Imageset size:
2.07 TB
Imageset DOI:
Experimental metadata:
Download xml json
Contains:
  • micrographs - multiframe
  • micrographs - single frame
  • picked particles - multiframe - processed
1. Unaligned Falcon IV movie frames
Category:
micrographs - multiframe
Image format:
MRCS
No. of images or tilt series:
3168
Image size:
(4096, 4096)
Pixel type:
SIGNED 16 BIT INTEGER
Pixel spacing:
(0.816, 0.816)
Details:
3,168 movies were acquired from two grids of apoferritin prepared with BIU. The pixel size was calibrated at 0.816 Å/pixel by fitting a crystal structure of human ferritin L chain (PDB ID: 2FFX) into a preliminary 3D map. Movies were collected for 9 sec with 29 exposure fractions, a camera exposure rate of ~3 e-/pix/sec, and total specimen exposure of ~40 e-/Å^2. Note: Due to software issues, the last frames in these raw movies have errors. Please exclude the last frame (frame 30) when doing any alignments.
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2. Aligned Dose-Weighted Micrographs
Category:
micrographs - single frame
Image format:
MRC
No. of images or tilt series:
3168
Image size:
(4096, 4096)
Pixel type:
32 BIT FLOAT
Pixel spacing:
(0.816, 0.816)
Details:
Exposure fractions were aligned with MotionCor2 within Relion, using 7x7 patches and a B factor of 500 pixel^2 for global alignment and 150 pixel^2 for local alignment. There is a micrographs_ctf.star file with CTF estimation from CTFFind4. Note: Due to software issues, the last frames in these raw movies have errors. Please exclude the last frame (frame 30) when doing any alignments.
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3. Final Particle Stack with Final Euler Angles and Shifts
Category:
picked particles - multiframe - processed
Image format:
MRCS
No. of images or tilt series:
1
Image size:
(288, 288)
Pixel type:
32 BIT FLOAT
Pixel spacing:
(0.816, 0.816)
Details:
Final polished particle stack with Euler angles and shifts. Higher order CTF aberration corrections were done within CryoSPARC 2 but the resulting parameters were not able to be exported to .star format here. When using this particle stack, it is recommended to do higher order CTF aberration corrections again in CryoSPARC/Relion to obtain the best resolution.
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