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TitleInsight into the Assembly of Viruses with Vertical Single β-barrel Major Capsid Proteins.
Journal, issue, pagesStructure, Vol. 23, Issue 10, Page 1866-1877, Year 2015
Publish dateOct 6, 2015
AuthorsDavid Gil-Carton / Salla T Jaakkola / Diego Charro / Bibiana Peralta / Daniel Castaño-Díez / Hanna M Oksanen / Dennis H Bamford / Nicola G A Abrescia /
PubMed AbstractArchaeal viruses constitute the least explored niche within the virosphere. Structure-based approaches have revealed close relationships between viruses infecting organisms from different domains of ...Archaeal viruses constitute the least explored niche within the virosphere. Structure-based approaches have revealed close relationships between viruses infecting organisms from different domains of life. Here, using biochemical and cryo-electron microscopy techniques, we solved the structure of euryarchaeal, halophilic, internal membrane-containing Haloarcula hispanica icosahedral virus 2 (HHIV-2). We show that the density of the two major capsid proteins (MCPs) recapitulates vertical single β-barrel proteins and that disulfide bridges stabilize the capsid. Below, ordered density is visible close to the membrane and at the five-fold vertices underneath the host-interacting vertex complex underpinning membrane-protein interactions. The HHIV-2 structure exemplifies the division of conserved architectural elements of a virion, such as the capsid, from those that evolve rapidly due to selective environmental pressure such as host-recognizing structures. We propose that in viruses with two vertical single β-barrel MCPs the vesicle is indispensable, and membrane-protein interactions serve as protein-railings for guiding the assembly.
External linksStructure / PubMed:26320579
MethodsEM (single particle) / EM (subtomogram averaging)
Resolution13.0 - 38.0 Å
Structure data

EMDB-3109:
Insight into the assembly of viruses with vertical single beta-barrel major capsid proteins
Method: EM (single particle) / Resolution: 13.0 Å

EMDB-3110:
Insight into the assembly of viruses with vertical single beta-barrel major capsid proteins
Method: EM (subtomogram averaging) / Resolution: 33.0 Å

EMDB-3111:
Insight into the assembly of viruses with vertical single beta-barrel major capsid proteins
Method: EM (subtomogram averaging) / Resolution: 38.0 Å

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