Structural and functional attributes of malaria parasite Ap4A hydrolase

Experimental Data Snapshot

  • Resolution: 2.60 Å
  • R-Value Free: 0.274 
  • R-Value Work: 0.210 
  • R-Value Observed: 0.217 

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Structural and functional attributes of malaria parasite diadenosine tetraphosphate hydrolase

Sharma, A.Yogavel, M.Sharma, A.

(2016) Sci Rep 6: 19981-19981

  • DOI: https://doi.org/10.1038/srep19981
  • Primary Citation of Related Structures:  
    5CFI, 5CFJ

  • PubMed Abstract: 

    Malaria symptoms are driven by periodic multiplication cycles of Plasmodium parasites in human red blood corpuscles (RBCs). Malaria infection still accounts for ~600,000 annual deaths, and hence discovery of both new drug targets and drugs remains vital. In the present study, we have investigated the malaria parasite enzyme diadenosine tetraphosphate (Ap4A) hydrolase that regulates levels of signalling molecules like Ap4A by hydrolyzing them to ATP and AMP. We have tracked the spatial distribution of parasitic Ap4A hydrolase in infected RBCs, and reveal its unusual localization on the infected RBC membrane in subpopulation of infected cells. Interestingly, enzyme activity assays reveal an interaction between Ap4A hydrolase and the parasite growth inhibitor suramin. We also present a high resolution crystal structure of Ap4A hydrolase in apo- and sulphate- bound state, where the sulphate resides in the enzyme active site by mimicking the phosphate of substrates like Ap4A. The unexpected infected erythrocyte localization of the parasitic Ap4A hydrolase hints at a possible role of this enzyme in purinerigic signaling. In addition, atomic structure of Ap4A hydrolase provides insights for selective drug targeting.

  • Organizational Affiliation

    Structural and Computational Biology Group, International Centre for Genetic Engineering and Biotechnology (ICGEB), Aruna Asaf Ali Road, New Delhi, 110067, India.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
BIS(5'-nucleosyl)-tetraphosphatase (Diadenosine tetraphosphatase), putative
A, B, C, D
152Plasmodium falciparum 3D7Mutation(s): 0 
Gene Names: PFE1035cPF3D7_0520600
Find proteins for C0H4F3 (Plasmodium falciparum (isolate 3D7))
Explore C0H4F3 
Go to UniProtKB:  C0H4F3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupC0H4F3
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.60 Å
  • R-Value Free: 0.274 
  • R-Value Work: 0.210 
  • R-Value Observed: 0.217 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 163.31α = 90
b = 64.245β = 100.08
c = 61.405γ = 90
Software Package:
Software NamePurpose
HKL-2000data processing
DNAdata collection
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-02-10
    Type: Initial release
  • Version 1.1: 2016-02-17
    Changes: Database references
  • Version 1.2: 2017-08-16
    Changes: Database references, Derived calculations