1G9S

CRYSTAL STRUCTURE OF A COMPLEX BETWEEN E.COLI HPRT AND IMP


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.201 
  • R-Value Observed: 0.201 

Starting Model: experimental
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This is version 1.4 of the entry. See complete history


Literature

Crystal structures of free, IMP-, and GMP-bound Escherichia coli hypoxanthine phosphoribosyltransferase.

Guddat, L.W.Vos, S.Martin, J.L.Keough, D.T.de Jersey, J.

(2002) Protein Sci 11: 1626-1638

  • DOI: https://doi.org/10.1110/ps.0201002
  • Primary Citation of Related Structures:  
    1G9S, 1G9T, 1GRV

  • PubMed Abstract: 

    Crystal structures have been determined for free Escherichia coli hypoxanthine phosphoribosyltransferase (HPRT) (2.9 A resolution) and for the enzyme in complex with the reaction products, inosine 5'-monophosphate (IMP) and guanosine 5'-monophosphate (GMP) (2.8 A resolution). Of the known 6-oxopurine phosphoribosyltransferase (PRTase) structures, E. coli HPRT is most similar in structure to that of Tritrichomonas foetus HGXPRT, with a rmsd for 150 Calpha atoms of 1.0 A. Comparison of the free and product bound structures shows that the side chain of Phe156 and the polypeptide backbone in this vicinity move to bind IMP or GMP. A nonproline cis peptide bond, also found in some other 6-oxopurine PRTases, is observed between Leu46 and Arg47 in both the free and complexed structures. For catalysis to occur, the 6-oxopurine PRTases have a requirement for divalent metal ion, usually Mg(2+) in vivo. In the free structure, a Mg(2+) is coordinated to the side chains of Glu103 and Asp104. This interaction may be important for stabilization of the enzyme before catalysis. E. coli HPRT is unique among the known 6-oxopurine PRTases in that it exhibits a marked preference for hypoxanthine as substrate over both xanthine and guanine. The structures suggest that its substrate specificity is due to the modes of binding of the bases. In E. coli HPRT, the carbonyl oxygen of Asp163 would likely form a hydrogen bond with the 2-exocyclic nitrogen of guanine (in the HPRT-guanine-PRib-PP-Mg(2+) complex). However, hypoxanthine does not have a 2-exocyclic atom and the HPRT-IMP structure suggests that hypoxanthine is likely to occupy a different position in the purine-binding pocket.


  • Organizational Affiliation

    Department of Biochemistry and Molecular Biology, School of Molecular and Microbial Science, The University of Queensland, St. Lucia, Qld. 4072, Australia.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
HYPOXANTHINE PHOSPHORIBOSYLTRANSFERASE
A, B
182Escherichia coliMutation(s): 0 
Gene Names: HPT
EC: 2.4.2.8
UniProt
Find proteins for P0A9M2 (Escherichia coli (strain K12))
Explore P0A9M2 
Go to UniProtKB:  P0A9M2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0A9M2
Sequence Annotations
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  • Reference Sequence
Small Molecules
Binding Affinity Annotations 
IDSourceBinding Affinity
IMP PDBBind:  1G9S Ki: 2.47e+5 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.201 
  • R-Value Observed: 0.201 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 84.14α = 90
b = 84.14β = 90
c = 167.27γ = 120
Software Package:
Software NamePurpose
X-PLORmodel building
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling
X-PLORphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-08-28
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance
  • Version 1.3: 2024-03-13
    Changes: Data collection, Database references, Derived calculations
  • Version 1.4: 2024-04-03
    Changes: Refinement description