Biological Assembly 1  

 3D View: Structure | Electron Density

Global Symmetry: Helical - H  (3D View)
Global Stoichiometry: Homo 3-mer - A3 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 30.75 kDa 
• Atom Count: 1901 
• Modelled Residue Count: 229 
• Deposited Residue Count: 267 
• Unique protein chains: 1

1WUD

E. coli RecQ HRDC domain

• DOI: 10.2210/pdb1WUD/pdb

• Classification: HYDROLASE
• Organism(s): Escherichia coli
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): Yes 


• Deposited: 2004-12-04 Released: 2005-08-09 
• Deposition Author(s): Bernstein, D.A., Keck, J.L.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.20 Å
• R-Value Free: 0.263 
• R-Value Work: 0.225 
• R-Value Observed: 0.227 

Literature

Conferring Substrate Specificity to DNA Helicases: Role of the RecQ HRDC Domain

Bernstein, D.A., Keck, J.L.

(2005) Structure 13: 1173-1182

• PubMed: 16084389 
• DOI: 10.1016/j.str.2005.04.018
• Primary Citation of Related Structures:  
  1WUD


• PubMed Abstract: 
  

RecQ DNA helicases are multidomain enzymes that play pivotal roles in genome maintenance pathways. While the ATPase and helicase activities of these enzymes can be attributed to the conserved catalytic core domain, the role of the Helicase-and-RNase-D-C-terminal (HRDC) domain in RecQ function has yet to be elucidated. Here, we report the crystal structure of the E. coli RecQ HRDC domain, revealing a globular fold that resembles known DNA binding domains. We show that this domain preferentially binds single-stranded DNA and identify its DNA binding surface. HRDC domain mutations in full-length RecQ lead to surprising differences in its structure-specific DNA binding properties. These data support a model in which naturally occurring variations in DNA binding residues among diverse RecQ homologs serve to target these enzymes to distinct substrates and provide insight into a mechanism whereby RecQ enzymes have evolved distinct functions in organisms that encode multiple recQ genes.

---

Organizational Affiliation: 

Department of Biomolecular Chemistry, University of Wisconsin Medical School, Madison 53706-1532, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
ATP-dependent DNA helicase recQ	A, B, C [auth D]	89	Escherichia coli	Mutation(s): 5  EC: 3.6.1 (PDB Primary Data), 3.6.4.12 (UniProt)
UniProt
Find proteins for P15043 (Escherichia coli (strain K12)) Explore P15043  Go to UniProtKB:  P15043

Small Molecules

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
MSE	A, B, C [auth D]	L-PEPTIDE LINKING	C5 H11 N O2 Se		MET

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.20 Å
• R-Value Free: 0.263 
• R-Value Work: 0.225 
• R-Value Observed: 0.227 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 38.304	α = 90
b = 64.611	β = 90
c = 98.114	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
HKL-2000	data reduction
SCALEPACK	data scaling
SOLVE	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2004-12-04 
• Released Date: 2005-08-09 
Deposition Author(s): Bernstein, D.A., Keck, J.L.

Revision History  

• Version 1.0: 2005-08-09
  Type: Initial release
  
• Version 1.1: 2008-04-30
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Refinement description, Version format compliance