Vibiro cholerae ParA2

Experimental Data Snapshot

  • Resolution: 2.60 Å
  • R-Value Free: 0.337 
  • R-Value Work: 0.274 
  • R-Value Observed: 0.280 

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This is version 1.2 of the entry. See complete history


The structure of the bacterial DNA segregation ATPase filament reveals the conformational plasticity of ParA upon DNA binding.

Parker, A.V.Mann, D.Tzokov, S.B.Hwang, L.C.Bergeron, J.R.C.

(2021) Nat Commun 12: 5166-5166

  • DOI: https://doi.org/10.1038/s41467-021-25429-2
  • Primary Citation of Related Structures:  
    7NPD, 7NPF

  • PubMed Abstract: 

    The efficient segregation of replicated genetic material is an essential step for cell division. Bacterial cells use several evolutionarily-distinct genome segregation systems, the most common of which is the type I Par system. It consists of an adapter protein, ParB, that binds to the DNA cargo via interaction with the parS DNA sequence; and an ATPase, ParA, that binds nonspecific DNA and mediates cargo transport. However, the molecular details of how this system functions are not well understood. Here, we report the cryo-EM structure of the Vibrio cholerae ParA2 filament bound to DNA, as well as the crystal structures of this protein in various nucleotide states. These structures show that ParA forms a left-handed filament on DNA, stabilized by nucleotide binding, and that ParA undergoes profound structural rearrangements upon DNA binding and filament assembly. Collectively, our data suggest the structural basis for ParA's cooperative binding to DNA and the formation of high ParA density regions on the nucleoid.

  • Organizational Affiliation

    Department of Molecular Biology and Biotechnology, the University of Sheffield, Sheffield, UK. ling.hwang@aru.ac.uk.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Walker A-type ATPase407Vibrio choleraeMutation(s): 0 
Gene Names: 
Find proteins for Q9KKJ2 (Vibrio cholerae serotype O1 (strain ATCC 39315 / El Tor Inaba N16961))
Explore Q9KKJ2 
Go to UniProtKB:  Q9KKJ2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9KKJ2
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.60 Å
  • R-Value Free: 0.337 
  • R-Value Work: 0.274 
  • R-Value Observed: 0.280 
  • Space Group: P 32 1 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 63.247α = 90
b = 63.247β = 90
c = 214.373γ = 120
Software Package:
Software NamePurpose
XDSdata reduction
xia2data scaling
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2021-05-19
    Type: Initial release
  • Version 1.1: 2021-10-13
    Changes: Data collection, Database references, Refinement description
  • Version 1.2: 2024-01-31
    Changes: Data collection, Refinement description