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TitleThe cryo-EM structure of African swine fever virus unravels a unique architecture comprising two icosahedral protein capsids and two lipoprotein membranes.
Journal, issue, pagesJ Biol Chem, Vol. 295, Issue 1, Page 1-12, Year 2020
Publish dateJan 3, 2020
AuthorsGerman Andrés / Diego Charro / Tania Matamoros / Rebecca S Dillard / Nicola G A Abrescia /
PubMed AbstractAfrican swine fever virus (ASFV) is a complex nucleocytoplasmic large DNA virus (NCLDV) that causes a devastating swine disease currently present in many countries of Africa, Europe, and Asia. ...African swine fever virus (ASFV) is a complex nucleocytoplasmic large DNA virus (NCLDV) that causes a devastating swine disease currently present in many countries of Africa, Europe, and Asia. Despite intense research efforts, relevant gaps in the architecture of the infectious virus particle remain. Here, we used single-particle cryo-EM to analyze the three-dimensional structure of the mature ASFV particle. Our results show that the ASFV virion, with a radial diameter of ∼2,080 Å, encloses a genome-containing nucleoid surrounded by two distinct icosahedral protein capsids and two lipoprotein membranes. The outer capsid forms a hexagonal lattice (triangulation number = 277) composed of 8,280 copies of the double jelly-roll major capsid protein (MCP) p72, arranged in trimers displaying a pseudo-hexameric morphology, and of 60 copies of a penton protein at the vertices. The inner protein layer, organized as a = 19 capsid, confines the core shell, and it is composed of the mature products derived from the ASFV polyproteins pp220 and pp62. Also, an icosahedral membrane lies between the two protein layers, whereas a pleomorphic envelope wraps the outer capsid. This high-level organization confers to ASFV a unique architecture among the NCLDVs that likely reflects the complexity of its infection process and may help explain current challenges in controlling it.
External linksJ Biol Chem / PubMed:31649031 / PubMed Central
MethodsEM (single particle)
Resolution4.6 - 23.1 Å
Structure data

EMDB-10325:
cryo-EM map of ASFV MCP p72 homotrimers purified from virion
Method: EM (single particle) / Resolution: 4.6 Å

EMDB-10346:
Structure of African Swine fever virus
Method: EM (single particle) / Resolution: 23.1 Å

Source
  • African swine fever virus

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