X-ray structure of DNA processing protein A (DprA) from Streptococcus pneumoniae

Experimental Data Snapshot

  • Resolution: 2.70 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.219 
  • R-Value Observed: 0.221 

wwPDB Validation   3D Report Full Report

This is version 1.1 of the entry. See complete history


Structure-function analysis of pneumococcal DprA protein reveals that dimerization is crucial for loading RecA recombinase onto DNA during transformation.

Quevillon-Cheruel, S.Campo, N.Mirouze, N.Mortier-Barriere, I.Brooks, M.A.Boudes, M.Durand, D.Soulet, A.L.Lisboa, J.Noirot, P.Martin, B.van Tilbeurgh, H.Noirot-Gros, M.F.Claverys, J.P.Polard, P.

(2012) Proc Natl Acad Sci U S A 109: E2466-E2475

  • DOI: https://doi.org/10.1073/pnas.1205638109
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Transformation promotes genome plasticity in bacteria via RecA-driven homologous recombination. In the gram-positive human pathogen Streptococcus pneumoniae, the transformasome a multiprotein complex, internalizes, protects, and processes transforming DNA to generate chromosomal recombinants. Double-stranded DNA is internalized as single strands, onto which the transformation-dedicated DNA processing protein A (DprA) ensures the loading of RecA to form presynaptic filaments. We report that the structure of DprA consists of the association of a sterile alpha motif domain and a Rossmann fold and that DprA forms tail-to-tail dimers. The isolation of DprA self-interaction mutants revealed that dimerization is crucial for the formation of nucleocomplexes in vitro and for genetic transformation. Residues important for DprA-RecA interaction also were identified and mutated, establishing this interaction as equally important for transformation. Positioning of key interaction residues on the DprA structure revealed an overlap of DprA-DprA and DprA-RecA interaction surfaces. We propose a model in which RecA interaction promotes rearrangement or disruption of the DprA dimer, enabling the subsequent nucleation of RecA and its polymerization onto ssDNA.

  • Organizational Affiliation

    Institut de Biochimie et de Biophysique Moléculaire et Cellulaire, Université de Paris-Sud, Centre National de la Recherche Scientifique, Unité Mixte de Recherche 8619, Bât 430, 91405 Orsay Cedex, France. sophie.quevillon-cheruel@u-psud.fr

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
DNA processing protein DprA
A, B, C
288Streptococcus pneumoniaeMutation(s): 0 
Gene Names: SP_1266
Find proteins for A0A0H2UQA6 (Streptococcus pneumoniae serotype 4 (strain ATCC BAA-334 / TIGR4))
Explore A0A0H2UQA6 
Go to UniProtKB:  A0A0H2UQA6
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A0H2UQA6
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.70 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.219 
  • R-Value Observed: 0.221 
  • Space Group: I 41 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 300.24α = 90
b = 300.24β = 90
c = 78.34γ = 90
Software Package:
Software NamePurpose
ADSCdata collection
XDSdata reduction
XSCALEdata scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-08-29
    Type: Initial release
  • Version 1.1: 2012-09-26
    Changes: Database references