1DBR

HYPOXANTHINE GUANINE XANTHINE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Work: 0.168 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Crystal structures of Toxoplasma gondii HGXPRTase reveal the catalytic role of a long flexible loop.

Schumacher, M.A.Carter, D.Ross, D.S.Ullman, B.Brennan, R.G.

(1996) Nat Struct Biol 3: 881-887

  • DOI: 10.1038/nsb1096-881
  • Primary Citation of Related Structures:  
    1DBR

  • PubMed Abstract: 
  • Crystal structures of substrate-free and XMP-soaked hypoxanthine-guanine-xanthine phosphoribosyltransferase (HGXPRTase) of the opportunistic pathogen Toxoplasma gondii have been determined to 2.4 and 2.9 A resolution, respectively. HGXPRTase displays the conserved PRTase fold ...

    Crystal structures of substrate-free and XMP-soaked hypoxanthine-guanine-xanthine phosphoribosyltransferase (HGXPRTase) of the opportunistic pathogen Toxoplasma gondii have been determined to 2.4 and 2.9 A resolution, respectively. HGXPRTase displays the conserved PRTase fold. In the structure of the enzyme bound to its product, a long flexible loop (residues 115-126) is located away from the active site. Comparison to the substrate-free structure reveals a striking relocation of the loop, which is poised to cover the catalytic pocket, thus providing a mechanism by which the HG(X)PRTases shield their oxocarbonium transition states from nucleophilic attack by the bulk solvent. The conserved Ser 117-Tyr 118 dipeptide within the loop is brought to the active site, completing the ensemble of catalytic residues.


    Organizational Affiliation

    Department of Biochemistry and Molecular Biology, Oregon Health Sciences University, Portland 97201-3098, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
HYPOXANTHINE GUANINE XANTHINE PHOSPHORIBOSYLTRANSFERASEA, B, C, D231Toxoplasma gondiiMutation(s): 0 
Gene Names: HPRT
EC: 2.4.2.22 (UniProt), 2.4.2.8 (UniProt)
UniProt
Find proteins for Q26997 (Toxoplasma gondii)
Explore Q26997 
Go to UniProtKB:  Q26997
Protein Feature View
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Work: 0.168 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 65.15α = 90
b = 109.22β = 111.8
c = 79.74γ = 90
Software Package:
Software NamePurpose
TNTrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1997-12-03
    Type: Initial release
  • Version 1.1: 2008-03-03
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance