Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 23.73 kDa 
• Atom Count: 1718 
• Residue Count: 196 
• Unique protein chains: 1

2FBY

WRN exonuclease, Eu complex

• DOI: 10.2210/pdb2FBY/pdb

• Classification: TRANSFERASE
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2005-12-10 Released: 2006-04-25 
• Deposition Author(s): Perry, J.J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Free: 0.245 
• R-Value Work: 0.221 
• R-Value Observed: 0.221 

Literature

WRN exonuclease structure and molecular mechanism imply an editing role in DNA end processing.

Perry, J.J., Yannone, S.M., Holden, L.G., Hitomi, C., Asaithamby, A., Han, S., Cooper, P.K., Chen, D.J., Tainer, J.A.

(2006) Nat Struct Mol Biol 13: 414-422

• PubMed: 16622405 
• DOI: 10.1038/nsmb1088
• Structures With Same Primary Citation


• PubMed Abstract: 
  

WRN is unique among the five human RecQ DNA helicases in having a functional exonuclease domain (WRN-exo) and being defective in the premature aging and cancer-related disorder Werner syndrome. Here, we characterize WRN-exo crystal structures, biochemical activity and participation in DNA end joining. Metal-ion complex structures, active site mutations and activity assays reveal a nuclease mechanism mediated by two metal ions. The DNA end-binding Ku70/80 complex specifically stimulates WRN-exo activity, and structure-based mutational inactivation of WRN-exo alters DNA end joining in human cells. We furthermore establish structural and biochemical similarities of WRN-exo to DnaQ-family replicative proofreading exonucleases, describing WRN-specific adaptations consistent with double-stranded DNA specificity and functionally important conformational changes. These results indicate WRN-exo is a human DnaQ family member and support DnaQ-like proofreading activities stimulated by Ku70/80, with implications for WRN functions in age-related pathologies and maintenance of genomic integrity.

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Organizational Affiliation: 

Department of Molecular Biology and Skaggs Institute for Chemical Biology, The Scripps Research Institute, La Jolla, California 92037, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Werner syndrome helicase	A	205	Homo sapiens	Mutation(s): 0  Gene Names: WRN, RECQ3, RECQL2 EC: 2.7.7 (PDB Primary Data), 3.6.4.12 (UniProt), 3.1 (UniProt)
Find proteins for Q14191 (Homo sapiens) Explore Q14191  Go to UniProtKB:  Q14191
NIH Common Fund Data Resources
PHAROS  Q14191 GTEx  ENSG00000165392

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
EU3	A	EUROPIUM (III) ION Eu LNBHUCHAFZUEGJ-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Free: 0.245 
• R-Value Work: 0.221 
• R-Value Observed: 0.221 
• Space Group: P 3₂ 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 80.089	α = 90
b = 80.089	β = 90
c = 92.97	γ = 120

Software Package:

Software Name	Purpose
HKL-2000	data collection
SCALEPACK	data scaling
AMoRE	phasing
CNS	refinement
HKL-2000	data reduction

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2005-12-10 
• Released Date: 2006-04-25 
Deposition Author(s): Perry, J.J.

Revision History 

• Version 1.0: 2006-04-25
  Type: Initial release
  
• Version 1.1: 2008-05-01
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance