E. coli FtsK motor domain

Experimental Data Snapshot

  • Resolution: 2.70 Å
  • R-Value Free: 0.298 
  • R-Value Work: 0.246 
  • R-Value Observed: 0.246 

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This is version 1.3 of the entry. See complete history


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
  • Primary Citation of Related Structures:  
    2IUS, 2IUT, 2IUU

  • 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.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C, D, E
A, B, C, D, E, F
512Escherichia coliMutation(s): 1 
Find proteins for P46889 (Escherichia coli (strain K12))
Explore P46889 
Go to UniProtKB:  P46889
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP46889
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.70 Å
  • R-Value Free: 0.298 
  • R-Value Work: 0.246 
  • R-Value Observed: 0.246 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 97.6α = 90
b = 117.2β = 100.5
c = 132.8γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-08-29
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2024-05-08
    Changes: Data collection, Database references, Other