1ZUJ

The crystal structure of the Lactococcus lactis MG1363 DpsA protein

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.90 Å
  • R-Value Free: 0.322 
  • R-Value Work: 0.253 
  • R-Value Observed: 0.256 

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This is version 1.2 of the entry. See complete history. 


Literature

The crystal structures of Lactococcus lactis MG1363 Dps proteins reveal the presence of an N-terminal helix that is required for DNA binding.

Stillman, T.J., Upadhyay, M., Norte, V.A., Sedelnikova, S.E., Carradus, M., Tzokov, S., Bullough, P.A., Shearman, C.A., Gasson, M.J., Williams, C.H., Artymiuk, P.J., Green, J.

(2005) Mol Microbiol 57: 1101-1112

  • DOI: 10.1111/j.1365-2958.2005.04757.x
  • Primary Citation of Related Structures:  
    1ZS3, 1ZUJ

  • PubMed Abstract: 

    • Dps proteins play a major role in the protection of bacterial DNA from damage by reactive oxygen species. Previous studies have implicated the extended lysine-containing N-terminal regions of Dps subunits in DNA binding, but this part of the structure has not previously been observed crystallographically ...

    Dps proteins play a major role in the protection of bacterial DNA from damage by reactive oxygen species. Previous studies have implicated the extended lysine-containing N-terminal regions of Dps subunits in DNA binding, but this part of the structure has not previously been observed crystallographically. Here the structures of two Dps proteins (DpsA and DpsB) from Lactococcus lactis MG1363 reveal for the first time the presence of an N-terminal alpha helix that extends from the core of the Dps subunit. Consequently, the N-terminal helices are displayed in parallel pairs on the exterior of the dodecameric Dps assemblies. Both DpsA and DpsB bind DNA. Deletion of the DpsA N-terminal helix impaired DNA binding. The N-terminal Lys residues of Escherichia coli Dps have been implicated in DNA binding. Replacement of the lactococcal DpsA Lys residues 9, 15 and 16 by Glu did not inhibit DNA binding. However, DNA binding was inhibited by EDTA, suggesting a role for cations in DNA binding. In contrast to E. coli, Bacillus brevis and Mycobacterium smegmatis Dps:DNA complexes, in which DNA interacts with crystalline Dps phases, L. lactis DNA:Dps complexes appeared as non-crystalline aggregates of protein and DNA in electron micrographs.

    Related Citations: 
    • Two operons that encode FNR-like proteins in Lactococcus lactis
      Gostick, D.O., Griffin, H.G., Shearman, C.A., Scott, C., Green, J., Gasson, M.J., Guest, J.R.
      (1999) Mol Microbiol 31: 1523
    Organizational Affiliation: 

    Krebs Institute for Biomolecular Research, Department of Molecular Biology and Biotechnology, Firth Court, Western Bank, University of Sheffield, Sheffield S10 2TN, UK.



Macromolecules
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(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
hypothetical protein Llacc01001955A, B, C, D179Lactococcus lactisMutation(s): 0 
Gene Names: flpA
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.90 Å
  • R-Value Free: 0.322 
  • R-Value Work: 0.253 
  • R-Value Observed: 0.256 
  • Space Group: H 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 131.84α = 90
b = 131.84β = 90
c = 325.7γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
CCP4data scaling
TNTphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-08-30
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance