RadA bound to dTDP

Experimental Data Snapshot

  • Resolution: 3.50 Å
  • R-Value Free: 0.224 
  • R-Value Work: 0.183 
  • R-Value Observed: 0.185 

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Bacterial RadA is a DnaB-type helicase interacting with RecA to promote bidirectional D-loop extension.

Marie, L.Rapisarda, C.Morales, V.Berge, M.Perry, T.Soulet, A.L.Gruget, C.Remaut, H.Fronzes, R.Polard, P.

(2017) Nat Commun 8: 15638-15638

  • DOI: https://doi.org/10.1038/ncomms15638
  • Primary Citation of Related Structures:  
    5LKM, 5LKQ

  • PubMed Abstract: 

    Homologous recombination (HR) is a central process of genome biology driven by a conserved recombinase, which catalyses the pairing of single-stranded DNA (ssDNA) with double-stranded DNA to generate a D-loop intermediate. Bacterial RadA is a conserved HR effector acting with RecA recombinase to promote ssDNA integration. The mechanism of this RadA-mediated assistance to RecA is unknown. Here, we report functional and structural analyses of RadA from the human pathogen Streptococcus pneumoniae. RadA is found to facilitate RecA-driven ssDNA recombination over long genomic distances during natural transformation. RadA is revealed as a hexameric DnaB-type helicase, which interacts with RecA to promote orientated unwinding of branched DNA molecules mimicking D-loop boundaries. These findings support a model of DNA branch migration in HR, relying on RecA-mediated loading of RadA hexamers on each strand of the recipient dsDNA in the D-loop, from which they migrate divergently to facilitate incorporation of invading ssDNA.

  • Organizational Affiliation

    Laboratoire de Microbiologie et Génétique Moléculaires, UMR5100, Centre de Biologie Intégrative (CBI), Centre National de la Recherche Scientifique (CNRS), Université de Toulouse, UPS, Toulouse F-31062, France.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
DNA repair protein RadA
A, B, C
452Streptococcus pneumoniaeMutation(s): 0 
Gene Names: radAERS022181_02072
EC: 3.6.4
Find proteins for Q8DRP0 (Streptococcus pneumoniae (strain ATCC BAA-255 / R6))
Explore Q8DRP0 
Go to UniProtKB:  Q8DRP0
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8DRP0
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.50 Å
  • R-Value Free: 0.224 
  • R-Value Work: 0.183 
  • R-Value Observed: 0.185 
  • Space Group: I 2 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 99.4α = 90
b = 169.9β = 90
c = 187.42γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XDSdata scaling

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number

Revision History  (Full details and data files)

  • Version 1.0: 2017-06-07
    Type: Initial release