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Yorodumi- EMDB-0074: Template-free detection and classification of microsomal membrane... -
+Open data
-Basic information
Entry | Database: EMDB / ID: EMD-0074 | |||||||||
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Title | Template-free detection and classification of microsomal membrane bound complexes | |||||||||
Map data | Ribosome bound to fully assembled translocon complex | |||||||||
Sample |
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Biological species | Canis lupus familiaris (dog) | |||||||||
Method | subtomogram averaging / cryo EM / Resolution: 18.0 Å | |||||||||
Authors | Martinez-Sanchez A / Lucic V | |||||||||
Funding support | Germany, 1 items
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Citation | Journal: Nat Methods / Year: 2020 Title: Template-free detection and classification of membrane-bound complexes in cryo-electron tomograms. Authors: Antonio Martinez-Sanchez / Zdravko Kochovski / Ulrike Laugks / Johannes Meyer Zum Alten Borgloh / Saikat Chakraborty / Stefan Pfeffer / Wolfgang Baumeister / Vladan Lučić / Abstract: With faithful sample preservation and direct imaging of fully hydrated biological material, cryo-electron tomography provides an accurate representation of molecular architecture of cells. However, ...With faithful sample preservation and direct imaging of fully hydrated biological material, cryo-electron tomography provides an accurate representation of molecular architecture of cells. However, detection and precise localization of macromolecular complexes within cellular environments is aggravated by the presence of many molecular species and molecular crowding. We developed a template-free image processing procedure for accurate tracing of complex networks of densities in cryo-electron tomograms, a comprehensive and automated detection of heterogeneous membrane-bound complexes and an unsupervised classification (PySeg). Applications to intact cells and isolated endoplasmic reticulum (ER) allowed us to detect and classify small protein complexes. This classification provided sufficiently homogeneous particle sets and initial references to allow subsequent de novo subtomogram averaging. Spatial distribution analysis showed that ER complexes have different localization patterns forming nanodomains. Therefore, this procedure allows a comprehensive detection and structural analysis of complexes in situ. | |||||||||
History |
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-Structure visualization
Movie |
Movie viewer |
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Structure viewer | EM map: SurfViewMolmilJmol/JSmol |
Supplemental images |
-Downloads & links
-EMDB archive
Map data | emd_0074.map.gz | 6.2 MB | EMDB map data format | |
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Header (meta data) | emd-0074-v30.xml emd-0074.xml | 12.7 KB 12.7 KB | Display Display | EMDB header |
FSC (resolution estimation) | emd_0074_fsc.xml | 4.4 KB | Display | FSC data file |
Images | emd_0074.png | 36.7 KB | ||
Others | emd_0074_half_map_1.map.gz emd_0074_half_map_2.map.gz | 4.9 MB 5 MB | ||
Archive directory | http://ftp.pdbj.org/pub/emdb/structures/EMD-0074 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-0074 | HTTPS FTP |
-Related structure data
-Links
EMDB pages | EMDB (EBI/PDBe) / EMDataResource |
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Related items in Molecule of the Month |
-Map
File | Download / File: emd_0074.map.gz / Format: CCP4 / Size: 6.6 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Annotation | Ribosome bound to fully assembled translocon complex | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 5.24 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
CCP4 map header:
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-Supplemental data
-Half map: Ribosome bound to fully assembled translocon complex, 2nd half map
File | emd_0074_half_map_1.map | ||||||||||||
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Annotation | Ribosome bound to fully assembled translocon complex, 2nd half map | ||||||||||||
Projections & Slices |
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Density Histograms |
-Half map: Ribosome bound to fully assembled translocon complex, 1st half map
File | emd_0074_half_map_2.map | ||||||||||||
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Annotation | Ribosome bound to fully assembled translocon complex, 1st half map | ||||||||||||
Projections & Slices |
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Density Histograms |
-Sample components
-Entire : Mammalian ribosome bound to the native protein translocon on cani...
Entire | Name: Mammalian ribosome bound to the native protein translocon on canine pancreatic ER vesicles |
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Components |
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-Supramolecule #1: Mammalian ribosome bound to the native protein translocon on cani...
Supramolecule | Name: Mammalian ribosome bound to the native protein translocon on canine pancreatic ER vesicles type: complex / ID: 1 / Parent: 0 |
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Source (natural) | Organism: Canis lupus familiaris (dog) |
-Experimental details
-Structure determination
Method | cryo EM |
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Processing | subtomogram averaging |
Aggregation state | particle |
-Sample preparation
Concentration | 2.0 mg/mL |
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Buffer | pH: 7.6 |
Vitrification | Cryogen name: ETHANE-PROPANE / Chamber humidity: 70 % / Instrument: FEI VITROBOT MARK IV / Details: Blot 3 seconds before plunging.. |
-Electron microscopy
Microscope | FEI TITAN KRIOS |
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Electron beam | Acceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELDBright-field microscopy |
Image recording | Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: COUNTING / Average electron dose: 30.0 e/Å2 |
Experimental equipment | Model: Titan Krios / Image courtesy: FEI Company |
-Image processing
-Atomic model buiding 1
Refinement | Protocol: AB INITIO MODEL |
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