6APT

Trypanosoma brucei hypoxanthine guanine phosphoribosyltransferase in complex with {[(2S)-3-(2-amino-6-oxo-1,6-dihydro-9H-purin-9-yl)propane-1,2-diyl]bis(oxyethane-2,1-diyl)}bis(phosphonic acid)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.79 Å
  • R-Value Free: 0.212 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.199 

wwPDB Validation 3D Report Full Report



Literature

Evaluation of the Trypanosoma brucei 6-oxopurine salvage pathway as a potential target for drug discovery.

Dolezelova, E.Teran, D.Gahura, O.Kotrbova, Z.Prochazkova, M.Keough, D.Spacek, P.Hockova, D.Guddat, L.Zikova, A.

(2018) PLoS Negl Trop Dis 12: e0006301-e0006301

  • DOI: 10.1371/journal.pntd.0006301
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Due to toxicity and compliance issues and the emergence of resistance to current medications new drugs for the treatment of Human African Trypanosomiasis are needed. A potential approach to developing novel anti-trypanosomal drugs is by inhibition of ...

    Due to toxicity and compliance issues and the emergence of resistance to current medications new drugs for the treatment of Human African Trypanosomiasis are needed. A potential approach to developing novel anti-trypanosomal drugs is by inhibition of the 6-oxopurine salvage pathways which synthesise the nucleoside monophosphates required for DNA/RNA production. This is in view of the fact that trypanosomes lack the machinery for de novo synthesis of the purine ring. To provide validation for this approach as a drug target, we have RNAi silenced the three 6-oxopurine phosphoribosyltransferase (PRTase) isoforms in the infectious stage of Trypanosoma brucei demonstrating that the combined activity of these enzymes is critical for the parasites' viability. Furthermore, we have determined crystal structures of two of these isoforms in complex with several acyclic nucleoside phosphonates (ANPs), a class of compound previously shown to inhibit 6-oxopurine PRTases from several species including Plasmodium falciparum. The most potent of these compounds have Ki values as low as 60 nM, and IC50 values in cell based assays as low as 4 μM. This data provides a solid platform for further investigations into the use of this pathway as a target for anti-trypanosomal drug discovery.


    Organizational Affiliation

    Faculty of Science, University of South Bohemia, Branišovská, České Budějovice, Czech Republic.



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
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
45T
Query on 45T

Download CCD File 
A, B
{[(2S)-3-(2-amino-6-oxo-1,6-dihydro-9H-purin-9-yl)propane-1,2-diyl]bis(oxyethane-2,1-diyl)}bis(phosphonic acid)
C12 H21 N5 O9 P2
KFMQQVHVLQIQPE-QMMMGPOBSA-N
 Ligand Interaction
PEG
Query on PEG

Download CCD File 
A, B
DI(HYDROXYETHYL)ETHER
C4 H10 O3
MTHSVFCYNBDYFN-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
45TKi:  890   nM  Binding MOAD
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.79 Å
  • R-Value Free: 0.212 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.199 
  • Space Group: P 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 44.676α = 90
b = 94.401β = 90
c = 110.016γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XDSdata scaling
PHASERphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2018-03-14
    Type: Initial release