Crystal Structure of D-63 from Sulfolobus Spindle Virus 1

Experimental Data Snapshot

  • Resolution: 2.60 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.222 
  • R-Value Observed: 0.225 

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Structure of d-63 from sulfolobus spindle-shaped virus 1: surface properties of the dimeric four-helix bundle suggest an adaptor protein function

Kraft, P.Oeckinghaus, A.Gauss, G.H.Wiedenheft, B.Young, M.Lawrence, C.M.

(2004) J Virol 78: 7438-7442

  • DOI: https://doi.org/10.1128/JVI.78.14.7438-7442.2004
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Sulfolobus spindle-shaped virus 1 (SSV1) and its fusellovirus homologues can be found in many acidic (pH or=70 degrees C) around the world. SSV1 contains a 15.5-kb double-stranded DNA genome that encodes 34 proteins with greater than 50 amino acids. A site-specific integrase and a DnaA-like protein have been previously identified by sequence homology, and three structural proteins have been isolated from purified virus and identified by N-terminal sequencing (VP1, VP2, and VP3). The functions of the remaining 29 proteins are currently unknown. To assign functions to these proteins, we have initiated biochemical and structural studies on the SSV1 proteome. Here we report the structure of SSV1 D-63. The structure reveals a helix-turn-helix motif that dimerizes to form an antiparallel four-helix bundle. Mapping residues conserved among three fusellovirus isolates onto the structure shows that one face of the rod-shaped molecule is highly conserved. This conserved surface spans the dimer axis and thus exhibits 2-fold symmetry. Two smaller conserved patches, also related by 2-fold symmetry, are found on the opposite face of the molecule. All of these conserved surfaces are devoid of clefts or pockets typically used to bind small molecules, suggesting that D-63 may function as an adaptor protein in macromolecular assembly.

  • Organizational Affiliation

    Department of Chemistry and Biochemistry, Montana State University, Bozeman, MT 59717, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Hypothetical 7.5 kDa protein
A, B, C, D
69Sulfolobus spindle-shaped virus 1Mutation(s): 2 
Gene Names: D-63
Find proteins for P20215 (Sulfolobus spindle-shape virus 1)
Explore P20215 
Go to UniProtKB:  P20215
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP20215
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on MSE
A, B, C, D
Experimental Data & Validation

Experimental Data

  • Resolution: 2.60 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.222 
  • R-Value Observed: 0.225 
  • Space Group: P 62
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 110.65α = 90
b = 110.65β = 90
c = 47.45γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-07-13
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance