Crystal structure of the Thermoanaerobacter tengcongensis hypoxanthine-guanine phosphoribosyltransferase L160I mutant: insights into the inhibitor design

Experimental Data Snapshot

  • Resolution: 1.70 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.204 
  • R-Value Observed: 0.204 

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Crystal structure of Thermoanaerobacter tengcongensis hypoxanthine-guanine phosphoribosyl transferase L160I mutant--insights into inhibitor design.

Chen, Q.You, D.Liang, Y.Su, X.Gu, X.Luo, M.Zheng, X.

(2007) FEBS J 274: 4408-4415

  • DOI: https://doi.org/10.1111/j.1742-4658.2007.05970.x
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Hypoxanthine-guanine phosphoribosyltransferase (HGPRT) is a potential target for structure-based inhibitor design for the treatment of parasitic diseases. We created point mutants of Thermoanaerobacter tengcongensis HGPRT and tested their activities to identify side chains that were important for function. Mutating residues Leu160 and Lys133 substantially diminished the activity of HGPRT, confirming their importance in catalysis. All 11 HGPRT mutants were subject to crystallization screening. The crystal structure of one mutant, L160I, was determined at 1.7 A resolution. Surprisingly, the active site is occupied by a peptide from the N-terminus of a neighboring tetramer. These crystal contacts suggest an alternate strategy for structure-based inhibitor design.

  • Organizational Affiliation

    National Laboratory of Protein Engineering and Plant Genetic Engineering, Peking University, Beijing, China.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Hypoxanthine-guanine phosphoribosyltransferase185Caldanaerobacter subterraneus subsp. tengcongensisMutation(s): 3 
Gene Names: HGPRTHpt
Find proteins for Q8R7L0 (Caldanaerobacter subterraneus subsp. tengcongensis (strain DSM 15242 / JCM 11007 / NBRC 100824 / MB4))
Explore Q8R7L0 
Go to UniProtKB:  Q8R7L0
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8R7L0
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.70 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.204 
  • R-Value Observed: 0.204 
  • Space Group: I 2 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 52.21α = 90
b = 88.36β = 90
c = 93.03γ = 90
Software Package:
Software NamePurpose
PROTEUM PLUSdata reduction
PROTEUM PLUSdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-04-03
    Type: Initial release
  • Version 1.1: 2007-10-16
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2021-10-20
    Changes: Database references, Derived calculations
  • Version 1.4: 2024-02-14
    Changes: Data collection