|Entry||Database: EMDB / ID: 9238|
|Title||Single-particle reconstruction of reovirus T3D/T1L S4|
|Map data||Single-particle reconstruction of reovirus T3D/T1L S4|
|Sample||reovirus T3D/T1L S4:|
|Method||single particle reconstruction / cryo EM / 8.6 Å resolution|
|Authors||Snyder AJ / Wang JCY / Danthi P|
|Citation||Journal: J. Virol. / Year: 2018|
Title: Components of the reovirus capsid differentially contribute to stability.
Authors: Anthony J Snyder / Joseph Che-Yen Wang / Pranav Danthi
Abstract: The mammalian orthoreovirus (reovirus) outer capsid is composed of 200 μ1-σ3 heterohexamers and a maximum of 12 σ1 trimers. During cell entry, σ3 is degraded by luminal or intracellular proteases ...The mammalian orthoreovirus (reovirus) outer capsid is composed of 200 μ1-σ3 heterohexamers and a maximum of 12 σ1 trimers. During cell entry, σ3 is degraded by luminal or intracellular proteases to generate the infectious subviral particle (ISVP). When ISVP formation is prevented, reovirus fails to establish a productive infection, suggesting proteolytic priming is required for entry. ISVPs are then converted to ISVP*s, which is accompanied by μ1 rearrangements. The μ1 and σ3 proteins confer resistance to inactivating agents; however, neither the impact on capsid properties nor the mechanism (or basis) of inactivation is fully understood. In this report, we utilized T1L/T3D M2 and T3D/T1L S4 to investigate the determinants of reovirus stability. Both reassortants encode mismatched subunits. When μ1-σ3 were derived from different strains, virions resembled wild type in structure and protease sensitivity. T1L/T3D M2 and T3D/T1L S4 ISVPs were less thermostable than wild type ISVPs. In contrast, virions were equally susceptible to heating. Virion associated μ1 adopted an ISVP*-like conformation concurrent with inactivation; σ3 preserves infectivity by preventing μ1 rearrangements. Moreover, thermostability was enhanced by a hyperstable variant of μ1. Unlike the outer capsid, the inner capsid (core) was highly resistant to elevated temperatures. The dual layered architecture allowed for differential sensitivity to inactivating agents. Nonenveloped and enveloped viruses are exposed to the environment during transmission to a new host. Protein-protein and/or protein-lipid interactions stabilize the particle and protect the viral genome. Mammalian orthoreovirus (reovirus) is composed of two concentric, protein shells. The μ1 and σ3 proteins form the outer capsid; contacts between neighboring subunits are thought to confer resistance to inactivating agents. We further investigated the determinants of reovirus stability. The outer capsid was disrupted concurrent with the loss of infectivity; virion associated μ1 rearranged into an altered conformation. Heat sensitivity was controlled by σ3; however, particle integrity was enhanced by a single μ1 mutation. In contrast, the inner capsid (core) displayed superior resistance to heating. These findings reveal structural components that differentially contribute to reovirus stability.
|Date||Deposition: Oct 19, 2018 / Header (metadata) release: Oct 31, 2018 / Map release: Oct 31, 2018 / Last update: Oct 31, 2018|
|Structure viewer||EM map: |
Downloads & links
|File||emd_9238.map.gz (map file in CCP4 format, 530605 KB)|
|Projections & slices|
Images are generated by Spider.
|Voxel size||X=Y=Z: 2.61 Å|
CCP4 map header:
-Entire reovirus T3D/T1L S4
|Entire||Name: reovirus T3D/T1L S4 / Number of components: 1|
-Component #1: virus, Reovirus sp.
|Virus||Name: Reovirus sp. / Class: VIRION / Empty: No / Enveloped: No / Isolate: STRAIN|
|Species||Species: Reovirus sp.|
|Specimen||Specimen state: particle / Method: cryo EM|
|Sample solution||pH: 7.4|
|Vitrification||Cryogen name: ETHANE|
-Electron microscopy imaging
|Imaging||Microscope: JEOL 3200FS|
|Electron gun||Electron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Electron dose: 2 e/Å2 / Illumination mode: FLOOD BEAM|
|Lens||Imaging mode: BRIGHT FIELD|
|Specimen Holder||Model: OTHER|
|Camera||Detector: DIRECT ELECTRON DE-64 (8k x 8k)|
|Processing||Method: single particle reconstruction / Number of projections: 27339|
|3D reconstruction||Resolution: 8.6 Å / Resolution method: FSC 0.143 CUT-OFF|
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