Biological Assembly 1  

 3D View: Structure | 1D-3D View | Validation Report | Ligand Interaction

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Hetero 4-mer - A2B2 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 39.94 kDa 
• Atom Count: 2706 
• Modelled Residue Count: 327 
• Deposited Residue Count: 354 
• Unique protein chains: 2

1XEX

Structural biochemistry of ATP-driven dimerization and DNA stimulated activation of SMC ATPases.

• PDB DOI: 10.2210/pdb1XEX/pdb

• Classification: CELL CYCLE
• Organism(s): Pyrococcus furiosus
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 2004-09-13 Released: 2004-12-07 
• Deposition Author(s): Lammens, A., Schele, A., Hopfner, K.-P.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.50 Å
• R-Value Free: 0.261 
• R-Value Work: 0.207 

Literature

Structural biochemistry of ATP-driven dimerization and DNA-stimulated activation of SMC ATPases

Lammens, A., Schele, A., Hopfner, K.-P.

(2004) Curr Biol 14: 1778-1782

• PubMed: 15458651 
• DOI: 10.1016/j.cub.2004.09.044
• Primary Citation of Related Structures:  
  1XEW, 1XEX


• PubMed Abstract: 
  

Structural maintenance of chromosome (SMC) proteins play a central role in higher-order chromosome structure in all kingdoms of life. SMC proteins consist of a long coiled-coil domain that joins an ATP binding cassette (ABC) ATPase domain on one side and a dimerization domain on the other side. SMC proteins require ATP binding or hydrolysis to promote cohesion and condensation, which is suggested to proceed via formation of SMC rings or assemblies. To learn more about the role of ATP in the architecture of SMC proteins, we report crystal structures of nucleotide-free and ATP bound P. furiosus SMC ATPase domains. ATP dimerizes two SMC ATPase domains by binding to opposing Walker A and signature motifs, indicating that ATP binding can directly assemble SMC proteins. DNA stimulates ATP hydrolysis in the engaged SMC ABC domains, suggesting that ATP hydrolysis can be allosterically regulated. Structural and mutagenesis data identify an SMC protein conserved-arginine finger that is required for DNA stimulation of the ATPase activity and directly connects a putative DNA interaction site to ATP. Our results suggest that stimulation of the SMC ATPase activity may be a specific feature to regulate the ATP-driven assembly and disassembly of SMC proteins.

---

Organizational Affiliation: 

Gene Center and Institute of Biochemistry, University of Munich, Feodor-Lynen-Strasse 25, 81377 Munich, Germany.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
SMC protein	A	182	Pyrococcus furiosus	Mutation(s): 0  Gene Names: smc
UniProt
Find proteins for Q8TZY2 (Pyrococcus furiosus (strain ATCC 43587 / DSM 3638 / JCM 8422 / Vc1)) Explore Q8TZY2  Go to UniProtKB:  Q8TZY2

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
SMC protein	B	172	Pyrococcus furiosus	Mutation(s): 1  Gene Names: SMC

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ATP	D [auth A]	ADENOSINE-5'-TRIPHOSPHATE C10 H16 N5 O13 P3 ZKHQWZAMYRWXGA-KQYNXXCUSA-N
MG	C [auth A]	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.50 Å
• R-Value Free: 0.261 
• R-Value Work: 0.207 
• Space Group: P 3₁ 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 102.6	α = 90
b = 102.6	β = 90
c = 87.2	γ = 120

Software Package:

Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
SHARP	phasing
CNS	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2004-09-13 
• Released Date: 2004-12-07 
Deposition Author(s): Lammens, A., Schele, A., Hopfner, K.-P.

Revision History  

• Version 1.0: 2004-12-07
  Type: Initial release
  
• Version 1.1: 2008-04-30
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2021-11-10
  Changes: Database references, Derived calculations