Structure of Anopheles gambiae 3-hydroxykynurenine transaminase

Experimental Data Snapshot

  • Resolution: 2.40 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.213 
  • R-Value Observed: 0.213 

Starting Model: experimental
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Crystal Structure of the Anopheles Gambiae 3-Hydroxykynurenine Transaminase

Rossi, F.Garavaglia, S.Giovenzana, G.B.Arca, B.Li, J.Rizzi, M.

(2006) Proc Natl Acad Sci U S A 103: 5711

  • DOI: https://doi.org/10.1073/pnas.0510233103
  • Primary Citation of Related Structures:  
    2CH1, 2CH2

  • PubMed Abstract: 

    In Anopheles gambiae, the vector for the most deadly malaria parasite Plasmodium falciparum, xanthurenic acid (XA) plays a key role in parasite gametogenesis and fertility. In mosquitoes, XA is produced by transamination of 3-hydroxykynurenine (3-HK), a reaction that represents the main route to prevent the accumulation of the potentially toxic 3-HK excess. Interfering with XA metabolism in A. gambiae therefore appears an attractive avenue for the development of malaria transmission-blocking drugs and insecticides. We have determined the crystal structure of A. gambiae 3-HK transaminase in its pyridoxal 5'-phosphate form and in complex with a newly synthesized competitive enzyme inhibitor. Structural inspection of the enzyme active site reveals the key molecular determinants for ligand recognition and catalysis. Major contributions toward inhibitor binding are provided by a salt bridge between the inhibitor carboxylate and Arg-356 and by a remarkable hydrogen bond network involving the anthranilic moiety of the inhibitor and backbone atoms of residues Gly-25 and Asn-44. This study may be useful for the structure-based design of specific enzyme inhibitors of potential interest as antimalarial agents.

  • Organizational Affiliation

    Dipartimento di Scienze Chimiche, Alimentari Farmaceutiche e Farmacologiche-Drug and Food Biotechnology Center, University of Piemonte Orientale "Amedeo Avogadro," Via Bovio 6, 28100 Novara, Italy.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C, D
396Anopheles gambiaeMutation(s): 0 
Find proteins for Q7PRG3 (Anopheles gambiae)
Explore Q7PRG3 
Go to UniProtKB:  Q7PRG3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ7PRG3
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.40 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.213 
  • R-Value Observed: 0.213 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 87.434α = 90
b = 84.167β = 99.86
c = 118.793γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-03-28
    Type: Initial release
  • Version 1.1: 2013-07-17
    Changes: Atomic model, Database references, Derived calculations, Non-polymer description, Other, Structure summary, Version format compliance
  • Version 1.2: 2023-12-13
    Changes: Data collection, Database references, Derived calculations, Refinement description