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TitleAssembly of complex viruses exemplified by a halophilic euryarchaeal virus.
Journal, issue, pagesNat Commun, Vol. 10, Issue 1, Page 1456, Year 2019
Publish dateMar 29, 2019
AuthorsLuigi De Colibus / Elina Roine / Thomas S Walter / Serban L Ilca / Xiangxi Wang / Nan Wang / Alan M Roseman / Dennis Bamford / Juha T Huiskonen / David I Stuart /
PubMed AbstractMany of the largest known viruses belong to the PRD1-adeno structural lineage characterised by conserved pseudo-hexameric capsomers composed of three copies of a single major capsid protein (MCP). ...Many of the largest known viruses belong to the PRD1-adeno structural lineage characterised by conserved pseudo-hexameric capsomers composed of three copies of a single major capsid protein (MCP). Here, by high-resolution cryo-EM analysis, we show that a class of archaeal viruses possess hetero-hexameric MCPs which mimic the PRD1-adeno lineage trimer. These hetero-hexamers are built from heterodimers and utilise a jigsaw-puzzle system of pegs and holes, and underlying minor capsid proteins, to assemble the capsid laterally from the 5-fold vertices. At these vertices proteins engage inwards with the internal membrane vesicle whilst 2-fold symmetric horn-like structures protrude outwards. The horns are assembled from repeated globular domains attached to a central spine, presumably facilitating multimeric attachment to the cell receptor. Such viruses may represent precursors of the main PRD1-adeno lineage, similarly engaging cell-receptors via 5-fold spikes and using minor proteins to define particle size.
External linksNat Commun / PubMed:30926810 / PubMed Central
MethodsEM (single particle)
Resolution3.8 - 7.3 Å
Structure data

4633

6qt9

EMDB-4633, PDB-6qt9:
Cryo-EM structure of SH1 full particle.
Method: EM (single particle) / Resolution: 3.8 Å

EMDB-4634:
Localized reconstruction of archaeal virus SH1 vertex calculated without symmetry
Method: EM (single particle) / Resolution: 7.3 Å

EMDB-4656:
Localized reconstruction of archaeal virus SH1 spike calculated with C2 symmetry
Method: EM (single particle) / Resolution: 6.2 Å

Source
  • haloarcula hispanica virus sh1
KeywordsVIRUS / euryarcheal virus / SH1

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