2JKY

SACCHAROMYCES CEREVISIAE HYPOXANTHINE-GUANINE PHOSPHORIBOSYLTRANSFERASE IN COMPLEX WITH GMP (GUANOSINE 5'- MONOPHOSPHATE) (TETRAGONAL CRYSTAL FORM)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.203 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history

Literature

Functional Significance of Four Successive Glycine Residues in the Pyrophosphate Binding Loop of Fungal 6-Oxopurine Phosphoribosyltransferases.

Moynie, L.Giraud, M.F.Breton, A.Boissier, F.Daignan-Fornier, B.Dautant, A.

(2012) Protein Sci. 21: 1185

  • DOI: 10.1002/pro.2098
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Hypoxanthine-guanine phosphoribosyltransferase (HGPRT) is a key enzyme of the purine recycling pathway that catalyzes the conversion of 5-phospho-ribosyl-α-1-pyrophosphate and guanine or hypoxanthine to guanosine monophosphate (GMP) or inosine monoph ...

    Hypoxanthine-guanine phosphoribosyltransferase (HGPRT) is a key enzyme of the purine recycling pathway that catalyzes the conversion of 5-phospho-ribosyl-α-1-pyrophosphate and guanine or hypoxanthine to guanosine monophosphate (GMP) or inosine monophosphate (IMP), respectively, and pyrophosphate (PPi). We report the first crystal structure of a fungal 6-oxopurine phosphoribosyltransferase, the Saccharomyces cerevisiae HGPRT (Sc-HGPRT) in complex with GMP. The crystal structures of full length protein with (WT1) or without (WT2) sulfate that mimics the phosphate group in the PPi binding site were solved by molecular replacement using the structure of a truncated version (Δ7) solved beforehand by multiwavelength anomalous diffusion. Sc-HGPRT is a dimer and adopts the overall structure of class I phosphoribosyltransferases (PRTs) with a smaller hood domain and a short two-stranded parallel β-sheet linking the N- to the C-terminal end. The catalytic loops in WT1 and WT2 are in an open form while in Δ7, due to an inter-subunit disulfide bridge, the catalytic loop is in either an open or closed form. The closure is concomitant with a peptide plane flipping in the PPi binding loop. Moreover, owing the flexibility of a GGGG motif conserved in fungi, all the peptide bonds of the phosphate binding loop are in trans conformation whereas in nonfungal 6-oxopurine PRTs, one cis-peptide bond is required for phosphate binding. Mutations affecting the enzyme activity or the previously characterized feedback inhibition by GMP are located at the nucleotide binding site and the dimer interface.


    Related Citations: 
    • Crystal Structure of Escherichia Coli Xanthine Phosphoribosyltransferase.
      Vos, S.,De Jersey, J.,Martin, J.L.
      (1997) Biochemistry 36: 4125
    • Structures of Free and Complexed Forms of Escherichia Coli Xanthine-Guanine Phosphoribosyltransferase.
      Vos, S.,Parry, R.J.,Burns, M.R.,De Jersey, J.,Martin, J.L.
      (1998) J.Mol.Biol. 282: 875
    • Lethal Accumulation of Guanylic Nucleotides in Saccharomyces Cerevisiae Hpt1-Deregulated Mutants.
      Breton, A.,Pinson, B.,Coulpier, F.,Giraud, M.,Dautant, A.,Daignan-Fornier, B.
      (2008) Genetics 178: 815


    Organizational Affiliation

    IBGC, Université de Bordeaux, UMR 5095, F-33000 Bordeaux, France.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
HYPOXANTHINE-GUANINE PHOSPHORIBOSYLTRANSFERASE
A, B
213Saccharomyces cerevisiae (strain ATCC 204508 / S288c)Mutation(s): 0 
Gene Names: HPT1 (BRA6)
EC: 2.4.2.8
Find proteins for Q04178 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to UniProtKB:  Q04178
Small Molecules
Ligands 3 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
MG
Query on MG

Download SDF File 
Download CCD File 
A
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 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: 2.3 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.203 
  • Space Group: I 4
Unit Cell:
Length (Å)Angle (°)
a = 128.443α = 90.00
b = 128.443β = 90.00
c = 56.126γ = 90.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
SOLVEphasing
DENZOdata reduction
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-11-17
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Advisory, Version format compliance
  • Version 1.2: 2012-09-19
    Type: Database references, Derived calculations, Other, Structure summary
  • Version 1.3: 2019-03-06
    Type: Data collection, Experimental preparation, Other
  • Version 1.4: 2019-05-08
    Type: Data collection, Experimental preparation