Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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

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

Macromolecule Content

• Total Structure Weight: 28.27 kDa 
• Atom Count: 2051 
• Residue Count: 244 
• Unique protein chains: 1

1WCV

Structure of the bacterial chromosome segregation protein Soj

• DOI: 10.2210/pdb1WCV/pdb

• Classification: CHROMOSOME SEGREGATION
• Organism(s): Thermus thermophilus HB27
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2004-11-25 Released: 2005-01-12 
• Deposition Author(s): Leonard, T.A., Butler, P.J.G., Lowe, J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.60 Å
• R-Value Free: 0.252 
• R-Value Work: 0.229 
• R-Value Observed: 0.229 

Literature

Bacterial Chromosome Segregation: Structure and DNA Binding of the Soj Dimer--A Conserved Biological Switch

Leonard, T.A., Butler, P.J.G., Lowe, J.

(2005) EMBO J 24: 270

• PubMed: 15635448 
• DOI: 10.1038/sj.emboj.7600530
• Primary Citation of Related Structures:  
  2BEK, 2BEJ, 1WCV


• PubMed Abstract: 
  

Soj and Spo0J of the Gram-negative hyperthermophile Thermus thermophilus belong to the conserved ParAB family of bacterial proteins implicated in plasmid and chromosome partitioning. Spo0J binds to DNA near the replication origin and localises at the poles following initiation of replication. Soj oscillates in the nucleoid region in an ATP- and Spo0J-dependent fashion. Here, we show that Soj undergoes ATP-dependent dimerisation in solution and forms nucleoprotein filaments with DNA. Crystal structures of Soj in three nucleotide states demonstrate that the empty and ADP-bound states are monomeric, while a hydrolysis-deficient mutant, D44A, is capable of forming a nucleotide 'sandwich' dimer. Soj ATPase activity is stimulated by Spo0J or the N-terminal 20 amino-acid peptide of Spo0J. Our analysis shows that dimerisation and activation involving a peptide containing a Lys/Arg is conserved for Soj, ParA and MinD and their modulators Spo0J, ParB and MinE, respectively. By homology to the nitrogenase iron protein and the GTPases Ffh/FtsY, we suggest that Soj dimerisation and regulation represent a conserved biological switch.

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Organizational Affiliation: 

MRC Laboratory of Molecular Biology, Cambridge, UK. [e-mail]

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
SEGREGATION PROTEIN	1	257	Thermus thermophilus HB27	Mutation(s): 0  Gene Names: soj, TT_C1605 EC: 3.6
Find proteins for Q72H90 (Thermus thermophilus (strain HB27 / ATCC BAA-163 / DSM 7039)) Explore Q72H90  Go to UniProtKB:  Q72H90

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
IOD	1	IODIDE ION I XMBWDFGMSWQBCA-UHFFFAOYSA-M
CL	1	CHLORIDE ION Cl VEXZGXHMUGYJMC-UHFFFAOYSA-M

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.60 Å
• R-Value Free: 0.252 
• R-Value Work: 0.229 
• R-Value Observed: 0.229 
• Space Group: P 4₃ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 61.353	α = 90
b = 61.353	β = 90
c = 124.526	γ = 90

Software Package:

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

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2004-11-25 
• Released Date: 2005-01-12 
Deposition Author(s): Leonard, T.A., Butler, P.J.G., Lowe, J.

Revision History 

• Version 1.0: 2005-01-12
  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: 2018-01-24
  Changes: Source and taxonomy