Crystal structure of ORF132 of the archaeal virus Acidianus Filamentous Virus 1 (AFV1)

Experimental Data Snapshot

  • Resolution: 1.95 Å
  • R-Value Free: 0.196 
  • R-Value Work: 0.157 
  • R-Value Observed: 0.162 

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Acidianus filamentous virus 1 coat proteins display a helical fold spanning the filamentous archaeal viruses lineage

Goulet, A.Blangy, S.Redder, P.Prangishvili, D.Felisberto-Rodrigues, C.Forterre, P.Campanacci, V.Cambillau, C.

(2009) Proc Natl Acad Sci U S A 106: 21155-21160

  • DOI: https://doi.org/10.1073/pnas.0909893106
  • Primary Citation of Related Structures:  
    3FBL, 3FBZ

  • PubMed Abstract: 

    Acidianus filamentous virus 1 (AFV1), a member of the Lipothrixviridae family, infects the hyperthermophilic, acidophilic crenarchaeaon Acidianus hospitalis. The virion, covered with a lipidic outer shell, is 9,100-A long and contains a 20.8-kb linear dsDNA genome. We have identified the two major coat proteins of the virion (MCPs; 132 and 140 amino acids). They bind DNA and form filaments when incubated with linear dsDNA. A C-terminal domain is identified in their crystal structure with a four-helix-bundle fold. In the topological model of the virion filament core, the genomic dsDNA superhelix wraps around the AFV1-132 basic protein, and the AFV1-140 basic N terminus binds genomic DNA, while its lipophilic C-terminal domain is imbedded in the lipidic outer shell. The four-helix bundle fold of the MCPs from AFV1 is identical to that of the coat protein (CP) of Sulfolobus islandicus rod-shaped virus (SIRV), a member of the Rudiviridae family. Despite low sequence identity between these proteins, their high degree of structural similarity suggests that they could have derived from a common ancestor and could thus define an yet undescribed viral lineage.

  • Organizational Affiliation

    Architecture et Fonction des Macromolécules Biologiques, Centre national de la Recherche Scientifique and Universités Aix-Marseille I & II, Architecture et Fonction des Macromolécules Biologiques, Unité Mixte de Recherche 6098, Case 932, 163 avenue de Luminy, 13288 Marseille Cedex 9, France.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Putative uncharacterized protein82Captovirus AFV1Mutation(s): 0 
Gene Names: AFV1_ORF132
Find proteins for Q70LC7 (Acidianus filamentous virus 1 (isolate United States/Yellowstone))
Explore Q70LC7 
Go to UniProtKB:  Q70LC7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ70LC7
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on CL

Download Ideal Coordinates CCD File 
Experimental Data & Validation

Experimental Data

  • Resolution: 1.95 Å
  • R-Value Free: 0.196 
  • R-Value Work: 0.157 
  • R-Value Observed: 0.162 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 28.353α = 90
b = 47.576β = 90
c = 60.079γ = 90
Software Package:
Software NamePurpose
PHENIXmodel building
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-11-10
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance