5KAP

Trypanosome brucei Hypoxanthine-guanine phosphoribosyltranferase in complex with a 9-(4-(phosphonobutil)hypoxanthine


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.95 Å
  • R-Value Free: 0.309 
  • R-Value Work: 0.275 
  • R-Value Observed: 0.278 

wwPDB Validation 3D Report Full Report



Literature

Crystal structures and inhibition of Trypanosoma brucei hypoxanthine-guanine phosphoribosyltransferase.

Teran, D.Hockova, D.Cesnek, M.Zikova, A.Naesens, L.Keough, D.T.Guddat, L.W.

(2016) Sci Rep 6: 35894-35894

  • DOI: 10.1038/srep35894
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Human African Trypanosomiasis (HAT) is a life-threatening infectious disease caused by the protozoan parasite, Trypanosoma brucei (Tbr). Due to the debilitating side effects of the current therapeutics and the emergence of resistance to these drugs, ...

    Human African Trypanosomiasis (HAT) is a life-threatening infectious disease caused by the protozoan parasite, Trypanosoma brucei (Tbr). Due to the debilitating side effects of the current therapeutics and the emergence of resistance to these drugs, new medications for this disease need to be developed. One potential new drug target is 6-oxopurine phosphoribosyltransferase (PRT), an enzyme central to the purine salvage pathway and whose activity is critical for the production of the nucleotides (GMP and IMP) required for DNA/RNA synthesis within this protozoan parasite. Here, the first crystal structures of this enzyme have been determined, these in complex with GMP and IMP and with three acyclic nucleoside phosphonate (ANP) inhibitors. The K i values for GMP and IMP are 30.5 μM and 77 μM, respectively. Two of the ANPs have K i values considerably lower than for the nucleotides, 2.3 μM (with guanine as base) and 15.8 μM (with hypoxanthine as base). The crystal structures show that when two of the ANPs bind, they induce an unusual conformation change to the loop where the reaction product, pyrophosphate, is expected to bind. This and other structural differences between the Tbr and human enzymes suggest selective inhibitors for the Tbr enzyme can be designed.


    Organizational Affiliation

    The School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, 4072 QLD, Australia.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Hypoxanthine-guanine phosphoribosyltransferaseA, B216Trypanosoma brucei bruceiMutation(s): 0 
Gene Names: HGPRT
EC: 2.4.2.8
Find proteins for Q07010 (Trypanosoma brucei brucei)
Explore Q07010 
Go to UniProtKB:  Q07010
Protein Feature View
 ( Mouse scroll to zoom / Hold left click to move )
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
6RH
Query on 6RH

Download CCD File 
A, B
4-(6-oxidanylidene-1~{H}-purin-9-yl)butylphosphonic acid
C9 H13 N4 O4 P
SXKIHSHTTWSCGF-UHFFFAOYSA-N
 Ligand Interaction
SO4
Query on SO4

Download CCD File 
A, B
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
MG
Query on MG

Download CCD File 
A, B
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.95 Å
  • R-Value Free: 0.309 
  • R-Value Work: 0.275 
  • R-Value Observed: 0.278 
  • Space Group: P 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 45.106α = 90
b = 93.893β = 90
c = 109.784γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
PHASESphasing
XDSdata reduction
XDSdata scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

  • Deposited Date: 2016-06-01 
  • Released Date: 2016-11-09 
  • Deposition Author(s): Teran, D., Guddat, L.

Revision History 

  • Version 1.0: 2016-11-09
    Type: Initial release