+Open data
-Basic information
Entry | Database: EMDB / ID: EMD-15391 | ||||||||||||
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Title | Subtomogram average of RNA-loaded poliovirus | ||||||||||||
Map data | Subtomogram average of RNA-loaded poliovirus | ||||||||||||
Sample |
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Keywords | poliovirus / cellular tomography / in situ / VIRUS | ||||||||||||
Biological species | Human poliovirus 1 Mahoney | ||||||||||||
Method | subtomogram averaging / cryo EM / Resolution: 28.0 Å | ||||||||||||
Authors | Dahmane S / Carlson LA | ||||||||||||
Funding support | France, European Union, Sweden, 3 items
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Citation | Journal: Nat Commun / Year: 2022 Title: Membrane-assisted assembly and selective secretory autophagy of enteroviruses. Authors: Selma Dahmane / Adeline Kerviel / Dustin R Morado / Kasturika Shankar / Björn Ahlman / Michael Lazarou / Nihal Altan-Bonnet / Lars-Anders Carlson / Abstract: Enteroviruses are non-enveloped positive-sense RNA viruses that cause diverse diseases in humans. Their rapid multiplication depends on remodeling of cytoplasmic membranes for viral genome ...Enteroviruses are non-enveloped positive-sense RNA viruses that cause diverse diseases in humans. Their rapid multiplication depends on remodeling of cytoplasmic membranes for viral genome replication. It is unknown how virions assemble around these newly synthesized genomes and how they are then loaded into autophagic membranes for release through secretory autophagy. Here, we use cryo-electron tomography of infected cells to show that poliovirus assembles directly on replication membranes. Pharmacological untethering of capsids from membranes abrogates RNA encapsidation. Our data directly visualize a membrane-bound half-capsid as a prominent virion assembly intermediate. Assembly progression past this intermediate depends on the class III phosphatidylinositol 3-kinase VPS34, a key host-cell autophagy factor. On the other hand, the canonical autophagy initiator ULK1 is shown to restrict virion production since its inhibition leads to increased accumulation of virions in vast intracellular arrays, followed by an increased vesicular release at later time points. Finally, we identify multiple layers of selectivity in virus-induced autophagy, with a strong selection for RNA-loaded virions over empty capsids and the segregation of virions from other types of autophagosome contents. These findings provide an integrated structural framework for multiple stages of the poliovirus life cycle. | ||||||||||||
History |
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-Structure visualization
Supplemental images |
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-Downloads & links
-EMDB archive
Map data | emd_15391.map.gz | 9.8 MB | EMDB map data format | |
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Header (meta data) | emd-15391-v30.xml emd-15391.xml | 13.4 KB 13.4 KB | Display Display | EMDB header |
Images | emd_15391.png | 22.9 KB | ||
Masks | emd_15391_msk_1.map | 10.5 MB | Mask map | |
Filedesc metadata | emd-15391.cif.gz | 4 KB | ||
Others | emd_15391_half_map_1.map.gz emd_15391_half_map_2.map.gz | 9.7 MB 9.7 MB | ||
Archive directory | http://ftp.pdbj.org/pub/emdb/structures/EMD-15391 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-15391 | 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_15391.map.gz / Format: CCP4 / Size: 10.5 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) | ||||||||||||||||||||||||||||||||||||
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Annotation | Subtomogram average of RNA-loaded poliovirus | ||||||||||||||||||||||||||||||||||||
Projections & slices | Image control
Images are generated by Spider. | ||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 4.29 Å | ||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
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-Supplemental data
-Mask #1
File | emd_15391_msk_1.map | ||||||||||||
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Projections & Slices |
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Density Histograms |
-Half map: half map 2
File | emd_15391_half_map_1.map | ||||||||||||
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Annotation | half map 2 | ||||||||||||
Projections & Slices |
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Density Histograms |
-Half map: half map 1
File | emd_15391_half_map_2.map | ||||||||||||
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Annotation | half map 1 | ||||||||||||
Projections & Slices |
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Density Histograms |
-Sample components
-Entire : Human poliovirus 1 Mahoney
Entire | Name: Human poliovirus 1 Mahoney |
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Components |
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-Supramolecule #1: Human poliovirus 1 Mahoney
Supramolecule | Name: Human poliovirus 1 Mahoney / type: virus / ID: 1 / Parent: 0 / NCBI-ID: 12081 / Sci species name: Human poliovirus 1 Mahoney / Virus type: VIRION / Virus isolate: STRAIN / Virus enveloped: No / Virus empty: Yes |
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-Experimental details
-Structure determination
Method | cryo EM |
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Processing | subtomogram averaging |
Aggregation state | particle |
-Sample preparation
Buffer | pH: 7.4 |
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Vitrification | Cryogen name: ETHANE-PROPANE |
-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 / Nominal defocus max: 4.0 µm / Nominal defocus min: 3.0 µm |
Image recording | Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Average electron dose: 3.0 e/Å2 |
Experimental equipment | Model: Titan Krios / Image courtesy: FEI Company |
-Image processing
Extraction | Number tomograms: 13 / Number images used: 556 |
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Final 3D classification | Number classes: 1 / Avg.num./class: 1 |
Final angle assignment | Type: ANGULAR RECONSTITUTION / Software - Name: Dynamo |
Final reconstruction | Applied symmetry - Point group: I (icosahedral) / Resolution.type: BY AUTHOR / Resolution: 28.0 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: Dynamo / Number subtomograms used: 357 |