2IUT | pdb_00002iut

P. aeruginosa FtsK motor domain, dimeric

• PDB DOI: https://doi.org/10.2210/pdb2IUT/pdb

• Classification: MEMBRANE PROTEIN
• Organism(s): Pseudomonas aeruginosa
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2006-06-07 Released: 2006-08-29 
• Deposition Author(s): Massey, T.H., Mercogliano, C.P., Yates, J., Sherratt, D.J., Lowe, J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.25 Å
• R-Value Free: 
  0.267 (Depositor), 0.210 (DCC) 
• R-Value Work: 
  0.221 (Depositor), 0.210 (DCC) 
• R-Value Observed: 
  0.221 (Depositor) 

Literature

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

• PubMed: 16916635 
• 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.

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Organizational Affiliation: 

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

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors and generated by PQS (software)

Macromolecule Content

• Total Structure Weight: 126.55 kDa 
• Atom Count: 6,673 
• Modelled Residue Count: 818 
• Deposited Residue Count: 1,148 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
DNA TRANSLOCASE FTSK	A, B	574	Pseudomonas aeruginosa	Mutation(s): 0
UniProt
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

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
AGS	C [auth A], F [auth B]	PHOSPHOTHIOPHOSPHORIC ACID-ADENYLATE ESTER C10 H16 N5 O12 P3 S NLTUCYMLOPLUHL-KQYNXXCUSA-N
MG	D [auth A], E [auth B]	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.25 Å
• R-Value Free:  0.267 (Depositor), 0.210 (DCC) 
• R-Value Work:  0.221 (Depositor), 0.210 (DCC) 
• R-Value Observed: 0.221 (Depositor) 

Space Group: P 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 46.168	α = 94.57
b = 57.431	β = 93.8
c = 98.057	γ = 107.66

Software Package:

Software Name	Purpose
CNS	refinement
MOSFLM	data reduction
SCALA	data scaling
PHASER	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2006-08-29 
Deposition Author(s): Massey, T.H., Mercogliano, C.P., Yates, J., Sherratt, D.J., Lowe, J.

Revision History  

• 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
• Version 1.2: 2024-05-08
  Changes: Data collection, Database references, Derived calculations, Other