F93 FROM STIV, a winged-helix DNA-binding protein

Experimental Data Snapshot

  • Resolution: 2.20 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.192 

wwPDB Validation   3D Report Full Report

This is version 1.2 of the entry. See complete history


A Winged-Helix Protein from Sulfolobus Turreted Icosahedral Virus Points Toward Stabilizing Disulfide Bonds in the Intracellular Proteins of a Hyperthermophilic Virus.

Larson, E.T.Eilers, B.Menon, S.Reiter, D.Ortmann, A.Young, M.J.Lawrence, C.M.

(2007) Virology 368: 249

  • DOI: https://doi.org/10.1016/j.virol.2007.06.040
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Sulfolobus turreted icosahedral virus (STIV) was the first non-tailed icosahedral virus to be isolated from an archaeal host. Like other archaeal viruses, its 37 open reading frames generally lack sequence similarity to genes with known function. The roles of the gene products in this and other archaeal viruses are thus largely unknown. However, a protein's three-dimensional structure may provide functional and evolutionary insight in cases of minimal sequence similarity. In this vein, the structure of STIV F93 reveals a homodimer with strong similarity to the winged-helix family of DNA-binding proteins. Importantly, an interchain disulfide bond is found at the dimer interface, prompting analysis of the cysteine distribution in the putative intracellular proteins of the viral proteome. The analysis suggests that intracellular disulfide bonds are common in cellular STIV proteins, where they enhance the thermostability of the viral proteome.

  • Organizational Affiliation

    Thermal Biology Institute, Montana State University, Bozeman, MT 59717, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
99Sulfolobus turreted icosahedral virus 1Mutation(s): 0 
Find proteins for Q6Q0J9 (Sulfolobus turreted icosahedral virus 1)
Explore Q6Q0J9 
Go to UniProtKB:  Q6Q0J9
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ6Q0J9
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.20 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.192 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 42.05α = 90
b = 102.594β = 90
c = 92.398γ = 90
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-05-31
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.2: 2019-05-08
    Changes: Data collection, Experimental preparation, Other