Crystal structure of a double Ile-to-Met mutant of protein ORF34 from lactococcus phage p2

Experimental Data Snapshot

  • Resolution: 2.10 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.239 
  • R-Value Observed: 0.240 

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Structure and Function of Phage P2 Orf34(P2), a New Type of Single-Stranded DNA Binding Protein.

Scaltriti, E.Tegoni, M.Rivetti, C.Launay, H.Masson, J.Y.Magadan, A.H.Tremblay, D.Moineau, S.Ramoni, R.Lichiere, J.Campanacci, V.Cambillau, C.Ortiz-Lombardia, M.

(2009) Mol Microbiol 73: 1156

  • DOI: https://doi.org/10.1111/j.1365-2958.2009.06844.x
  • Primary Citation of Related Structures:  
    2WKC, 2WKD

  • PubMed Abstract: 

    Lactococcus lactis, a Gram-positive bacterium widely used by the dairy industry, is subject to infection by a diverse population of virulent phages, predominantly by those of the 936 group, including the siphovirus phage p2. Confronted with the negative impact of phage infection on milk fermentation, the study of the biology of lactococcal provides insight from applied and fundamental perspectives. We decided to characterize the product of the orf34 gene from lactococcus phage p2, which was considered as a candidate single-stranded DNA binding protein (SSB) due to its localization downstream of a gene coding for a single-strand annealing protein. Two-dimensional gel electrophoresis showed that ORF34(p2) is expressed in large amounts during the early phases of phage infection, suggesting an important role in this process. Gel-shift assays, surface plasmon resonance and atomic force microscopy demonstrated that ORF34(p2) interacts with single-strand DNA with nanomolar affinity. We also determined the crystal structure of ORF34(p2) and showed that it bears a variation of the typical oligonucleotide/oligosaccharide binding-fold of SSBs. Finally, we found that ORF34(p2) is able to stimulate Escherichia coli RecA-mediated homologous recombination. The specific structural and biochemical properties that distinguish ORF34(p2) from other SSB proteins are discussed.

  • Organizational Affiliation

    Architecture et Fonction des Macromolécules Biologiques, UMR 6098 CNRS and Universités d'Aix-Marseille I and II, Campus de Luminy, Marseille Cedex 09, France.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
ORF34P2119Lactococcus virus P2Mutation(s): 2 
Find proteins for Q09WL7 (Lactococcus virus jj50)
Explore Q09WL7 
Go to UniProtKB:  Q09WL7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ09WL7
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on MSE
Experimental Data & Validation

Experimental Data

  • Resolution: 2.10 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.239 
  • R-Value Observed: 0.240 
  • Space Group: P 63 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 75.74α = 90
b = 75.74β = 90
c = 88.04γ = 120
Software Package:
Software NamePurpose
TRUNCATEdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-09-15
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Refinement description, Version format compliance
  • Version 1.2: 2019-05-29
    Changes: Data collection, Derived calculations, Experimental preparation, Other