Crystal Structure of sso2452 from Sulfolobus solfataricus P2

Experimental Data Snapshot

  • Resolution: 2.00 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.200 
  • R-Value Observed: 0.203 

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Structural and Functional Characterisation of a Conserved Archaeal Rada Paralog with Antirecombinase Activity.

Mcrobbie, A.M.Carter, L.G.Kerou, M.Liu, H.Mcmahon, S.A.Johnson, K.A.Oke, M.Naismith, J.H.White, M.F.

(2009) J Mol Biol 389: 661

  • DOI: https://doi.org/10.1016/j.jmb.2009.04.060
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    DNA recombinases (RecA in bacteria, Rad51 in eukarya and RadA in archaea) catalyse strand exchange between homologous DNA molecules, the central reaction of homologous recombination, and are among the most conserved DNA repair proteins known. RecA is the sole protein responsible for this reaction in bacteria, whereas there are several Rad51 paralogs that cooperate to catalyse strand exchange in eukaryotes. All archaea have at least one (and as many as four) RadA paralog, but their function remains unclear. Herein, we show that the three RadA paralogs encoded by the Sulfolobus solfataricus genome are expressed under normal growth conditions and are not UV inducible. We demonstrate that one of these proteins, Sso2452, which is representative of the large archaeal RadC subfamily of archaeal RadA paralogs, functions as an ATPase that binds tightly to single-stranded DNA. However, Sso2452 is not an active recombinase in vitro and inhibits D-loop formation by RadA. We present the high-resolution crystal structure of Sso2452, which reveals key structural differences from the canonical RecA family recombinases that may explain its functional properties. The possible roles of the archaeal RadA paralogs in vivo are discussed.

  • Organizational Affiliation

    Centre for Biomolecular Sciences, University of St. Andrews, North Haugh, St. Andrews, Fife KY16 9ST, UK.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
SSO2452235Saccharolobus solfataricus P2Mutation(s): 0 
Find proteins for Q97VZ8 (Saccharolobus solfataricus (strain ATCC 35092 / DSM 1617 / JCM 11322 / P2))
Explore Q97VZ8 
Go to UniProtKB:  Q97VZ8
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ97VZ8
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.00 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.200 
  • R-Value Observed: 0.203 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 41.105α = 90
b = 169.596β = 90
c = 39.428γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XSCALEdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-05-19
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.2: 2018-03-07
    Changes: Source and taxonomy
  • Version 1.3: 2023-12-13
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description