Crystal structure of Hypoxanthine-guanine phosphoribosyltransferase from Schistosoma mansoni in complex with IMP

Experimental Data Snapshot

  • Resolution: 2.80 Å
  • R-Value Free: 0.290 
  • R-Value Work: 0.232 
  • R-Value Observed: 0.234 

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In vitro and in vivo characterization of the multiple isoforms of Schistosoma mansoni hypoxanthine-guanine phosphoribosyltransferases.

Romanello, L.Zeraik, A.E.de Freitas Fernandes, A.Torini, J.R.Bird, L.E.Nettleship, J.E.Rada, H.Reddivari, Y.Owens, R.J.Serrao, V.H.B.DeMarco, R.Brandao-Neto, J.Pereira, H.D.

(2019) Mol Biochem Parasitol 229: 24-34

  • DOI: https://doi.org/10.1016/j.molbiopara.2019.02.005
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Schistosoma mansoni, the parasite responsible for schistosomiasis, lacks the "de novo" purine biosynthetic pathway and depends entirely on the purine salvage pathway for the supply of purines. Numerous reports of praziquantel resistance have been described, as well as stimulated efforts to develop new drugs against schistosomiasis. Hypoxanthine-guanine phosphoribosyltransferase (HGPRT) is a key enzyme of the purine salvage pathway. Here, we describe a crystallographic structure of the S. mansoni HPGRT-1 (SmHGPRT), complexed with IMP at a resolution of 2.8 Ǻ. Four substitutions were identified in the region of the active site between SmHGPRT-1 and human HGPRT. We also present data from RNA-Seq and WISH, suggesting that some isoforms of HGPRT might be involved in the process related to sexual maturation and reproduction in worms; furthermore, its enzymatic assays show that the isoform SmHGPRT-3 does not present the same catalytic efficiency as other isoforms. Finally, although other studies have previously suggested this enzyme as a potential antischistosomal chemotherapy target, the kinetics parameters reveal the impossibility to use SmHGPRT as an efficient chemotherapeutic target.

  • Organizational Affiliation

    Instituto de Física de São Carlos, Universidade de São Paulo, 13563-120, São Carlos, SP, Brazil.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Hypoxanthine-guanine phosphoribosyltransferase (HGPRT)
A, B, C, D
250Schistosoma mansoniMutation(s): 0 
Gene Names: HGPRTSmp_103560
Find proteins for P09383 (Schistosoma mansoni)
Explore P09383 
Go to UniProtKB:  P09383
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP09383
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.80 Å
  • R-Value Free: 0.290 
  • R-Value Work: 0.232 
  • R-Value Observed: 0.234 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 59.953α = 90
b = 117.957β = 90
c = 139.366γ = 90
Software Package:
Software NamePurpose
xia2data scaling
PDB_EXTRACTdata extraction
xia2data reduction

Structure Validation

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Ligand Structure Quality Assessment 

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Sao Paulo Research Foundation (FAPESP)Brazil2012/14223-9
Brazilian National Council for Scientific and Technological Development (CNPq)Brazil474402/2013-4

Revision History  (Full details and data files)

  • Version 1.0: 2017-03-15
    Type: Initial release
  • Version 1.1: 2019-03-27
    Changes: Data collection, Database references
  • Version 2.0: 2019-04-17
    Changes: Author supporting evidence, Data collection, Polymer sequence
  • Version 2.1: 2020-01-01
    Changes: Author supporting evidence
  • Version 2.2: 2023-09-27
    Changes: Data collection, Database references, Refinement description