NMR Structure of ParG symmetric dimer

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 20 
  • Conformers Submitted: 11 
  • Selection Criteria: structures with the lowest energy,target function 

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This is version 1.3 of the entry. See complete history


ParG, a protein required for active partition of bacterial plasmids, has a dimeric ribbon-helix-helix structure.

Golovanov, A.P.Barilla, D.Golovanova, M.Hayes, F.Lian, L.Y.

(2003) Mol Microbiol 50: 1141-1153

  • DOI: https://doi.org/10.1046/j.1365-2958.2003.03750.x
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The ParG protein (8.6 kDa) is an essential component of the DNA partition complex of multidrug resistance plasmid TP228. ParG is a dimer in solution, interacts with DNA sequences upstream of the parFG genes and also with the ParF partition protein both in the absence and presence of target DNA. Here, the solution nuclear magnetic resonance structure of ParG is reported. The ParG dimer is composed of a folded domain formed by two closely intertwined C-terminal parts (residues 33-76), and two highly mobile tails consisting of N-terminal regions (residues 1-32). The folded part of ParG has the ribbon-helix-helix (RHH) architecture similar to that of the Arc/MetJ superfamily of DNA-binding transcriptional repressors, although the primary sequence similarity is very low. ParG interacts with DNA predominantly via its folded domain; this interaction is coupled with ParG oligomerization. The dimeric RHH structure of ParG suggests that it binds to DNA by inserting the double-stranded beta-sheet into the major groove of DNA, in a manner similar to transcriptional repressors from the Arc/MetJ superfamily, and that ParG can function as a transcriptional repressor itself. A new classification of proteins belonging to the Arc/MetJ superfamily and ParG homologues is proposed, based on the location of a conserved positively charged residue at either the beginning or at the end of the beta-strand which forms part of the DNA recognition motif.

  • Organizational Affiliation

    Department of Biomolecular Sciences, University of Manchester Institute of Science and Technology (UMIST), PO Box 88, Manchester M60 1QD, UK.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
plasmid partition protein ParG
A, B
76Salmonella entericaMutation(s): 0 
Gene Names: parG
Find proteins for Q9KJ82 (Salmonella newport)
Explore Q9KJ82 
Go to UniProtKB:  Q9KJ82
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9KJ82
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 20 
  • Conformers Submitted: 11 
  • Selection Criteria: structures with the lowest energy,target function 

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-01-13
    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: 2022-02-23
    Changes: Database references, Derived calculations