Crystal structure of type I inorganic pyrophosphatase from Toxoplasma gondii.

Experimental Data Snapshot

  • Resolution: 2.35 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.204 
  • R-Value Observed: 0.206 

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Structural and Biochemical Characterization of Apicomplexan Inorganic Pyrophosphatases

Jamwal, A.Yogavel, M.Abdin, M.Z.Jain, S.K.Sharma, A.

(2017) Sci Rep 7: 5255-5255

  • DOI: https://doi.org/10.1038/s41598-017-05234-y
  • Primary Citation of Related Structures:  
    5WRT, 5WRU

  • PubMed Abstract: 

    Inorganic pyrophosphatases (PPase) participate in energy cycling and they are essential for growth and survival of organisms. Here we report extensive structural and functional characterization of soluble PPases from the human parasites Plasmodium falciparum (PfPPase) and Toxoplasma gondii (TgPPase). Our results show that PfPPase is a cytosolic enzyme whose gene expression is upregulated during parasite asexual stages. Cambialistic PfPPase actively hydrolyzes linear short chain polyphosphates like PP i , polyP 3 and ATP in the presence of Zn 2+ . A remarkable new feature of PfPPase is the low complexity asparagine-rich N-terminal region that mediates its dimerization. Deletion of N-region has an unexpected and substantial effect on the stability of PfPPase domain, resulting in aggregation and significant loss of enzyme activity. Significantly, the crystal structures of PfPPase and TgPPase reveal unusual and unprecedented dimeric organizations and provide new fundamental insights into the variety of oligomeric assemblies possible in eukaryotic inorganic PPases.

  • Organizational Affiliation

    Molecular Medicine Group, International Centre for Genetic Engineering and Biotechnology, Aruna Asaf Ali Marg, New Delhi, 110067, India.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Soluble inorganic pyrophosphatase
A, B
235Toxoplasma gondiiMutation(s): 0 
Gene Names: sPP1
Find proteins for Q4VUZ3 (Toxoplasma gondii)
Explore Q4VUZ3 
Go to UniProtKB:  Q4VUZ3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ4VUZ3
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.35 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.204 
  • R-Value Observed: 0.206 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 88.957α = 90
b = 88.957β = 90
c = 158.665γ = 120
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Department of Biotechnology, Govt. of IndiaIndia--

Revision History  (Full details and data files)

  • Version 1.0: 2017-10-11
    Type: Initial release
  • Version 1.1: 2024-03-20
    Changes: Data collection, Database references, Derived calculations, Refinement description