P. aeruginosa FtsK motor domain, dimeric

Experimental Data Snapshot

  • Resolution: 2.25 Å
  • R-Value Free: 0.267 
  • R-Value Work: 0.221 
  • R-Value Observed: 0.221 

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Double-Stranded DNA Translocation: Structure and Mechanism of Hexameric Ftsk

Massey, T.H.Mercogliano, C.P.Yates, J.Sherratt, D.J.Lowe, J.

(2006) Mol Cell 23: 457

  • DOI: https://doi.org/10.1016/j.molcel.2006.06.019

  • PubMed Abstract: 

    FtsK is a DNA translocase that coordinates chromosome segregation and cell division in bacteria. In addition to its role as activator of XerCD site-specific recombination, FtsK can translocate double-stranded DNA (dsDNA) rapidly and directionally and reverse direction. We present crystal structures of the FtsK motor domain monomer, showing that it has a RecA-like core, the FtsK hexamer, and also showing that it is a ring with a large central annulus and a dodecamer consisting of two hexamers, head to head. Electron microscopy (EM) demonstrates the DNA-dependent existence of hexamers in solution and shows that duplex DNA passes through the middle of each ring. Comparison of FtsK monomer structures from two different crystal forms highlights a conformational change that we propose is the structural basis for a rotary inchworm mechanism of DNA translocation.

  • Organizational Affiliation

    Division of Molecular Genetics, Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, United Kingdom.

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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
574Pseudomonas aeruginosaMutation(s): 0 
Find proteins for Q9I0M3 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Explore Q9I0M3 
Go to UniProtKB:  Q9I0M3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9I0M3
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.25 Å
  • R-Value Free: 0.267 
  • R-Value Work: 0.221 
  • R-Value Observed: 0.221 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 46.168α = 94.57
b = 57.431β = 93.8
c = 98.057γ = 107.66
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-08-29
    Type: Initial release
  • Version 1.1: 2013-01-30
    Changes: Atomic model, Derived calculations, Non-polymer description, Other, Version format compliance