crystal structure of Uracil-DNA glycosylase from Atlantic cod (Gadus morhua)

Experimental Data Snapshot

  • Resolution: 1.90 Å
  • R-Value Free: 0.206 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.186 

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The Crystal Structure of Uracil-DNA Glycosylase from Atlantic Cod (Gadus Morhua) Reveals Cold-Adaptation Features

Leiros, I.Moe, E.Lanes, O.Smalas, A.O.Willassen, N.P.

(2003) Acta Crystallogr D Biol Crystallogr 59: 1357

  • DOI: https://doi.org/10.1107/s0907444903011144
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Uracil-DNA glycosylase (UDG; EC is a DNA-repair protein that catalyses the hydrolysis of promutagenic uracil residues from single- or double-stranded DNA, generating free uracil and abasic DNA. The crystal structure of the catalytic domain of cod uracil-DNA glycosylase (cUDG) has been determined to 1.9 A resolution, with final R factors of 18.61 and 20.57% for the working and test sets of reflections, respectively. This is the first crystal structure of a uracil-DNA glycosylase from a cold-adapted species and a detailed comparison with the human enzyme is performed in order to rationalize the cold-adapted behaviour of the cod enzyme at the structural level. The catalytic domain of cUDG comprises 223 residues, with a sequence identity to the human UDG of 75%. The tertiary structures of the two enzymes are also similar, with an overall displacement in main-chain atomic positions of 0.63 A. The amino-acid substitutions and the differences in intramolecular hydrogen bonds, hydrophobic interactions, ion-pair interactions and electrostatic potentials are compared and discussed in order to gain insight into the factors that cause the increased activity and reduced thermostability of the cod enzyme. In particular, the reduced number of strong ion-pair interactions in the C-terminal half of cUDG is believed to greatly affect the flexibility and/or stability. Increased positive electrostatic surface potential on the DNA-facing side of cUDG seems to be responsible for increasing the affinity for the negatively charged DNA compared with that of hUDG.

  • Organizational Affiliation

    Department of Chemistry, Faculty of Science, University of Tromsø, N-9037 Tromsø, Norway.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
223Gadus morhuaMutation(s): 3 
Find proteins for Q9I983 (Gadus morhua)
Explore Q9I983 
Go to UniProtKB:  Q9I983
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9I983
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.90 Å
  • R-Value Free: 0.206 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.186 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 68.58α = 90
b = 67.189β = 119.86
c = 68.644γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-04-05
    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: 2023-12-13
    Changes: Data collection, Database references, Refinement description