Experimental Data Snapshot

  • Resolution: 1.80 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.214 
  • R-Value Observed: 0.214 

wwPDB Validation   3D Report Full Report

Ligand Structure Quality Assessment 

This is version 1.4 of the entry. See complete history


Crystal structure of adenosine kinase from Toxoplasma gondii at 1.8 A resolution.

Cook, W.J.DeLucas, L.J.Chattopadhyay, D.

(2000) Protein Sci 9: 704-707

  • DOI: https://doi.org/10.1110/ps.9.4.704
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Human infection with Toxoplasma gondii is an important cause of morbidity and mortality. Protozoan parasites such as T. gondii are incapable of de novo purine biosynthesis and must acquire purines from their host, so the purine salvage pathway offers a number of potential targets for antiparasitic chemotherapy. In T. gondii tachyzoites, adenosine is the predominantly salvaged purine nucleoside, and thus adenosine kinase is a key enzyme in the purine salvage pathway of this parasite. The structure of T. gondii adenosine kinase was solved using molecular replacement and refined by simulated annealing at 1.8 A resolution to an R-factor of 0.214. The overall structure and the active site geometry are similar to human adenosine kinase, although there are significant differences. The T. gondii adenosine kinase has several unique features compared to the human sequence, including a five-residue deletion in one of the four linking segments between the two domains, which is probably responsible for a major change in the orientation of the two domains with respect to each other. These structural differences suggest the possibility of developing specific inhibitors of the parasitic enzyme.

  • Organizational Affiliation

    Department of Pathology, University of Alabama at Birmingham, 35294, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
ADENOSINE KINASE363Toxoplasma gondiiMutation(s): 1 
Find proteins for Q9TVW2 (Toxoplasma gondii)
Explore Q9TVW2 
Go to UniProtKB:  Q9TVW2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9TVW2
Sequence Annotations
  • Reference Sequence
Small Molecules
Binding Affinity Annotations 
IDSourceBinding Affinity
ADN BindingDB:  1DGM Ki: 8900 (nM) from 1 assay(s)
PDBBind:  1DGM Ki: 8900 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 1.80 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.214 
  • R-Value Observed: 0.214 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 47.55α = 90
b = 68.75β = 100.3
c = 57.29γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report

Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2000-11-29
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2021-11-03
    Changes: Database references, Derived calculations
  • Version 1.4: 2023-08-09
    Changes: Data collection, Refinement description