Crystal structure of Sso10a-2, a DNA-binding protein from Sulfolobus solfataricus

Experimental Data Snapshot

  • Resolution: 2.00 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.205 
  • R-Value Observed: 0.206 

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Diverse architectural properties of Sso10a proteins: Evidence for a role in chromatin compaction and organization.

Driessen, R.P.Lin, S.N.Waterreus, W.J.van der Meulen, A.L.van der Valk, R.A.Laurens, N.Moolenaar, G.F.Pannu, N.S.Wuite, G.J.Goosen, N.Dame, R.T.

(2016) Sci Rep 6: 29422-29422

  • DOI: https://doi.org/10.1038/srep29422
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Sso10a proteins are small DNA-binding proteins expressed by the crenarchaeal model organism Sulfolobus solfataricus. Based on the structure of Sso10a1, which contains a winged helix-turn-helix motif, it is believed that Sso10a proteins function as sequence-specific transcription factors. Here we show that Sso10a1 and Sso10a2 exhibit different distinct DNA-binding modes. While the ability to bend DNA is shared between the two proteins, DNA bridging is observed only for Sso10a1 and only Sso10a2 exhibits filament formation along DNA. The architectural properties of Sso10a proteins suggest that these proteins fulfil generic roles in chromatin organization and compaction. As these proteins exhibit different binding behaviour depending on their DNA binding stoichiometry, altered levels of expression in the cell can be exploited to drive changes in local genome folding, which may operate to modulate transcription.

  • Organizational Affiliation

    Leiden Institute of Chemistry, Cell Observatory and Centre for Microbial Cell Biology, Leiden University, Einsteinweg 55, 2333 CC Leiden, The Netherlands.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
DNA-binding protein Sso10a-2
A, B, C
104Saccharolobus solfataricus P2Mutation(s): 0 
Gene Names: AAK42937.1SSO2827
Find proteins for Q97V10 (Saccharolobus solfataricus (strain ATCC 35092 / DSM 1617 / JCM 11322 / P2))
Explore Q97V10 
Go to UniProtKB:  Q97V10
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ97V10
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on MSE
A, B, C
Experimental Data & Validation

Experimental Data

  • Resolution: 2.00 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.205 
  • R-Value Observed: 0.206 
  • Space Group: P 21 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 60.221α = 90
b = 69.538β = 90
c = 80.727γ = 90
Software Package:
Software NamePurpose
SCALAdata scaling
PDB_EXTRACTdata extraction
XDSdata scaling
XSCALEdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-10-30
    Type: Initial release
  • Version 1.1: 2017-01-25
    Changes: Database references