ParR from plasmid pB171

Experimental Data Snapshot

  • Resolution: 2.80 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.239 
  • R-Value Observed: 0.239 

wwPDB Validation   3D Report Full Report

This is version 1.2 of the entry. See complete history


Structural Analysis of the Parr/Parc Plasmid Partition Complex.

Moller-Jensen, J.Ringgaard, S.Mercogliano, C.P.Gerdes, K.Lowe, J.

(2007) EMBO J 26: 4413

  • DOI: https://doi.org/10.1038/sj.emboj.7601864
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Accurate DNA partition at cell division is vital to all living organisms. In bacteria, this process can involve partition loci, which are found on both chromosomes and plasmids. The initial step in Escherichia coli plasmid R1 partition involves the formation of a partition complex between the DNA-binding protein ParR and its cognate centromere site parC on the DNA. The partition complex is recognized by a second partition protein, the actin-like ATPase ParM, which forms filaments required for the active bidirectional movement of DNA replicates. Here, we present the 2.8 A crystal structure of ParR from E. coli plasmid pB171. ParR forms a tight dimer resembling a large family of dimeric ribbon-helix-helix (RHH)2 site-specific DNA-binding proteins. Crystallographic and electron microscopic data further indicate that ParR dimers assemble into a helix structure with DNA-binding sites facing outward. Genetic and biochemical experiments support a structural arrangement in which the centromere-like parC DNA is wrapped around a ParR protein scaffold. This structure holds implications for how ParM polymerization drives active DNA transport during plasmid partition.

  • Organizational Affiliation

    MRC-Laboratory of Molecular Biology, Cambridge, UK. jakobm@bmb.sdu.dk

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
130Escherichia coliMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.80 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.239 
  • R-Value Observed: 0.239 
  • Space Group: P 61 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 96.768α = 90
b = 96.768β = 90
c = 124.945γ = 120
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-10-09
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance