1R71

Crystal Structure of the DNA binding domain of KorB in complex with the operator DNA

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.198 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history. 


Literature

Sequence-specific DNA binding determined by contacts outside the helix-turn-helix motif of the ParB homolog KorB.

Khare, D., Ziegelin, G., Lanka, E., Heinemann, U.

(2004) Nat Struct Mol Biol 11: 656-663

  • DOI: 10.1038/nsmb773
  • Primary Citation of Related Structures:  
    1R71

  • PubMed Abstract: 

    • The KorB protein of the broad-host-range plasmid RP4 acts as a multifunctional regulator of plasmid housekeeping genes, including those responsible for replication, maintenance and conjugation. Additionally, KorB functions as the ParB analog of the p ...

    The KorB protein of the broad-host-range plasmid RP4 acts as a multifunctional regulator of plasmid housekeeping genes, including those responsible for replication, maintenance and conjugation. Additionally, KorB functions as the ParB analog of the plasmid's partitioning system. The protein structure consists of eight helices, two of which belong to a predicted helix-turn-helix motif. Each half-site of the palindromic operator DNA binds one copy of the protein in the major groove. As confirmed by mutagenesis, recognition specificity is based mainly on two side chain interactions outside the helix-turn-helix motif with two bases next to the central base pair of the 13-base pair operator sequence. The surface of the KorB DNA-binding domain mirrors the overall acidity of KorB, whereas DNA binding occurs via a basic interaction surface. We present a model of KorB, including the structure of its dimerization domain, and discuss its interactions with the highly basic ParA homolog IncC.

    Organizational Affiliation: 

    Max-Delbrück-Centrum für Molekulare Medizin, Robert-Rössle-Strasse 10, D-13125 Berlin, Germany.



Macromolecules

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(by identity cutoff)  |  Structure
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Transcriptional repressor protein korBA, B, C, D178Escherichia coliMutation(s): 0 
Gene Names: korB
Find proteins for P07674 (Escherichia coli)
Explore P07674 
Go to UniProtKB:  P07674
Protein Feature View
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  • Reference Sequence
  • Find similar nucleic acids by:  Sequence   |   Structure
    • Entity ID: 1
    MoleculeChainsLengthOrganismImage
    5'-D(*AP*(BRU)P*TP*TP*TP*AP*GP*CP*GP*GP*CP*TP*AP*AP*AP*AP*G)-3'E, G, J, K17N/A
    • Find similar nucleic acids by:  Sequence   |   Structure
      • Entity ID: 2
      MoleculeChainsLengthOrganismImage
      5'-D(*CP*(BRU)P*TP*TP*TP*AP*GP*CP*CP*GP*CP*TP*AP*AP*AP*AP*(BRU))-3'F, H, I, L17N/A
      Experimental Data & Validation

      Experimental Data

      • Method: X-RAY DIFFRACTION
      • Resolution: 2.20 Å
      • R-Value Free: 0.250 
      • R-Value Work: 0.195 
      • R-Value Observed: 0.198 
      • Space Group: P 32 2 1
      Unit Cell:
      Length ( Å )Angle ( ˚ )
      a = 110.44α = 90
      b = 110.44β = 90
      c = 160.53γ = 120
      Software Package:
      Software NamePurpose
      REFMACrefinement
      MAR345data collection
      XDSdata scaling
      SOLVEphasing
      RESOLVEphasing

      Structure Validation

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      View more in-depth experimental data

      Entry History 

      Deposition Data

      Revision History 

      • Version 1.0: 2004-06-01
        Type: Initial release
      • Version 1.1: 2008-04-29
        Changes: Version format compliance
      • Version 1.2: 2011-07-13
        Changes: Version format compliance
      • Version 1.3: 2017-10-11
        Changes: Refinement description