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Open data
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Basic information
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Title | SIRM reconstruction of the unpublished protein | |||||||||
![]() | SIRM reconstruction of the unpublished protein, after Validation and Mask-Picking. | |||||||||
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![]() | Unpublished protein / MEMBRANE PROTEIN | |||||||||
Biological species | ![]() | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 3.8 Å | |||||||||
![]() | Zhang XZ / Zhu DJ / Cao WL | |||||||||
Funding support | ![]()
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![]() | ![]() Title: Correction of preferred orientation-induced distortion in cryo-electron microscopy maps. Authors: Dongjie Zhu / Weili Cao / Junxi Li / Chunling Wu / Duanfang Cao / Xinzheng Zhang / ![]() Abstract: Reconstruction maps of cryo-electron microscopy (cryo-EM) exhibit distortion when the cryo-EM dataset is incomplete, usually caused by unevenly distributed orientations. Prior efforts had been ...Reconstruction maps of cryo-electron microscopy (cryo-EM) exhibit distortion when the cryo-EM dataset is incomplete, usually caused by unevenly distributed orientations. Prior efforts had been attempted to address this preferred orientation problem using tilt-collection strategy and modifications to grids or to air-water interfaces. However, these approaches often require time-consuming experiments, and the effect was always protein dependent. Here, we developed a procedure containing removing misaligned particles and an iterative reconstruction method based on signal-to-noise ratio of Fourier component to correct this distortion by recovering missing data using a purely computational algorithm. This procedure called signal-to-noise ratio iterative reconstruction method (SIRM) was applied on incomplete datasets of various proteins to fix distortion in cryo-EM maps and to a more isotropic resolution. In addition, SIRM provides a better reference map for further reconstruction refinements, resulting in an improved alignment, which ultimately improves map quality and benefits model building. | |||||||||
History |
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Structure visualization
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 27.8 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 12.8 KB 12.8 KB | Display Display | ![]() |
Images | ![]() | 49.4 KB | ||
Masks | ![]() | 30.5 MB | ![]() | |
Filedesc metadata | ![]() | 3.8 KB | ||
Others | ![]() ![]() | 23.4 MB 23.4 MB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Validation report
Summary document | ![]() | 996.5 KB | Display | ![]() |
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Full document | ![]() | 996.1 KB | Display | |
Data in XML | ![]() | 10.4 KB | Display | |
Data in CIF | ![]() | 12.1 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
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Links
EMDB pages | ![]() ![]() |
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Map
File | ![]() | ||||||||||||||||||||
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Annotation | SIRM reconstruction of the unpublished protein, after Validation and Mask-Picking. | ||||||||||||||||||||
Voxel size | X=Y=Z: 1.167 Å | ||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||
Details | EMDB XML:
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-Supplemental data
-Mask #1
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Projections & Slices |
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Density Histograms |
-Half map: Conventional reconstruction of the unpublished protein, after Validation...
File | emd_38082_half_map_1.map | ||||||||||||
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Annotation | Conventional reconstruction of the unpublished protein, after Validation and Mask-Picking. Only used for measuring FSC. | ||||||||||||
Projections & Slices |
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Density Histograms |
-Half map: Conventional reconstruction of the unpublished protein, after Validation...
File | emd_38082_half_map_2.map | ||||||||||||
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Annotation | Conventional reconstruction of the unpublished protein, after Validation and Mask-Picking. Only used for measuring FSC. | ||||||||||||
Projections & Slices |
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Density Histograms |
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Sample components
-Entire : Unpublished protein
Entire | Name: Unpublished protein |
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Components |
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-Supramolecule #1: Unpublished protein
Supramolecule | Name: Unpublished protein / type: complex / ID: 1 / Parent: 0 |
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Source (natural) | Organism: ![]() |
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Buffer | pH: 7.5 |
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Vitrification | Cryogen name: ETHANE |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Image recording | Film or detector model: GATAN K3 (6k x 4k) / Average electron dose: 52.0 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.0 µm / Nominal defocus min: 0.8 µm |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Image processing
Startup model | Type of model: OTHER |
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Final reconstruction | Applied symmetry - Point group: C1 (asymmetric) / Resolution.type: BY AUTHOR / Resolution: 3.8 Å / Resolution method: OTHER / Software - Name: RELION (ver. 3.1.2) / Software - details: SIRM-RELION Details: The main map was low-passed to 3.8 Angstrom. The reported resolution via FSC-0.143 Gold-standard was 3.3 Angstrom Number images used: 74350 |
Initial angle assignment | Type: ANGULAR RECONSTITUTION |
Final angle assignment | Type: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 3.1.2) |