2VFA

Crystal structure of a chimera of Plasmodium falciparum and human hypoxanthine-guanine phosphoribosyl transferases


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.230 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Crystal Structure of a Chimera of Human and Plasmodium Falciparum Hypoxanthine Guanine Phosphoribosyltransferases Provides Insights Into Oligomerization.

Gayathri, P.Sujay Subbayya, I.N.Ashok, C.S.Selvi, T.S.Balaram, H.Murthy, M.R.N.

(2008) Proteins 73: 1010

  • DOI: 10.1002/prot.22129

  • PubMed Abstract: 
  • The crystal structure of a chimera of Plasmodium falciparum (Pf) and human hypoxanthine guanine phosphoribosyltransferases (HGPRT), which consists of the core of the protein from the human enzyme and the hood region from the Pf enzyme, has been deter ...

    The crystal structure of a chimera of Plasmodium falciparum (Pf) and human hypoxanthine guanine phosphoribosyltransferases (HGPRT), which consists of the core of the protein from the human enzyme and the hood region from the Pf enzyme, has been determined as a complex with the product guanosine monophosphate (GMP). The chimera can utilize hypoxanthine, guanine, and xanthine as substrates, similar to the Pf enzyme. It exists as a monomer-dimer mixture in solution, but shifts to a tetramer on addition of phosphoribosyl pyrophosphate (PRPP). The structural studies reveal that the asymmetric unit of the crystal consists of two monomers of the chimeric HGPRT. Surprisingly, the dimer interface of the chimera is the less extensive AC interface of the parent HGPRTs. An analysis of the crystal structures of the various human HGPRTs provides an explanation for the oligomeric characteristics of the chimera. Pro93 and Tyr197 form part of crucial interactions holding together the AB interface in the unliganded or GMP-bound forms of HGPRT, while Pro93 and His26 interact at the interface after binding of PRPP. Replacement of Tyr197 of human HGPRT by Ile207 in the chimera disrupts the interaction at the AB interface in the absence of PRPP. In the presence of PRPP, the interaction between Pro93 and His26 could restore the AB interface, shifting the chimeric enzyme to a tetrameric state. The structure provides valuable insights into the differences in the AB interface between Pf and human HGPRTs, which may be useful for designing selective inhibitors against the parasite enzyme.


    Organizational Affiliation

    Molecular Biophysics Unit, Indian Institute of Science, Bangalore 560 012, India.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
HYPOXANTHINE-GUANINE-XANTHINE PHOSPHORIBOSYLTRANSFERASE, HYPOXANTHINE-GUANINE PHOSPHORIBOSYLTRANSFERASE
A, B
229Plasmodium falciparumHomo sapiens
This entity is chimeric
Mutation(s): 0 
Gene Names: LACZ, HPRT1 (HPRT)
EC: 2.4.2.22, 2.4.2.8 2.4.2.8
Find proteins for P20035 (Plasmodium falciparum)
Go to UniProtKB:  P20035
Find proteins for P00492 (Homo sapiens)
Go to Gene View: HPRT1
Go to UniProtKB:  P00492
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A, B
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
5GP
Query on 5GP

Download SDF File 
Download CCD File 
A, B
GUANOSINE-5'-MONOPHOSPHATE
C10 H14 N5 O8 P
RQFCJASXJCIDSX-UUOKFMHZSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.230 
  • Space Group: I 2 3
Unit Cell:
Length (Å)Angle (°)
a = 161.811α = 90.00
b = 161.811β = 90.00
c = 161.811γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
PHASERphasing
SCALAdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-06-17
    Type: Initial release
  • Version 1.1: 2012-08-29
    Type: Database references, Derived calculations, Non-polymer description, Other, Structure summary, Version format compliance
  • Version 1.2: 2017-03-15
    Type: Source and taxonomy
  • Version 1.3: 2017-07-05
    Type: Data collection