Crystal structure of Aedes aegypti alanine glyoxylate aminotransferase

Experimental Data Snapshot

  • Resolution: 1.75 Å
  • R-Value Free: 0.203 
  • R-Value Work: 0.172 
  • R-Value Observed: 0.174 

Starting Model: experimental
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Crystal Structures of Aedes aegypti Alanine Glyoxylate Aminotransferase.

Han, Q.Robinson, H.Gao, Y.G.Vogelaar, N.Wilson, S.R.Rizzi, M.Li, J.

(2006) J Biol Chem 281: 37175-37182

  • DOI: https://doi.org/10.1074/jbc.M607032200
  • Primary Citation of Related Structures:  
    2HUF, 2HUI, 2HUU

  • PubMed Abstract: 

    Mosquitoes are unique in having evolved two alanine glyoxylate aminotransferases (AGTs). One is 3-hydroxykynurenine transaminase (HKT), which is primarily responsible for catalyzing the transamination of 3-hydroxykynurenine (3-HK) to xanthurenic acid (XA). Interestingly, XA is used by malaria parasites as a chemical trigger for their development within the mosquito. This 3-HK to XA conversion is considered the major mechanism mosquitoes use to detoxify the chemically reactive and potentially toxic 3-HK. The other AGT is a typical dipteran insect AGT and is specific for converting glyoxylic acid to glycine. Here we report the 1.75A high-resolution three-dimensional crystal structure of AGT from the mosquito Aedes aegypti (AeAGT) and structures of its complexes with reactants glyoxylic acid and alanine at 1.75 and 2.1A resolution, respectively. This is the first time that the three-dimensional crystal structures of an AGT with its amino acceptor, glyoxylic acid, and amino donor, alanine, have been determined. The protein is dimeric and adopts the type I-fold of pyridoxal 5-phosphate (PLP)-dependent aminotransferases. The PLP co-factor is covalently bound to the active site in the crystal structure, and its binding site is similar to those of other AGTs. The comparison of the AeAGT-glyoxylic acid structure with other AGT structures revealed that these glyoxylic acid binding residues are conserved in most AGTs. Comparison of the AeAGT-alanine structure with that of the Anopheles HKT-inhibitor complex suggests that a Ser-Asn-Phe motif in the latter may be responsible for the substrate specificity of HKT enzymes for 3-HK.

  • Organizational Affiliation

    Department of Biochemistry, Virginia Tech, Blacksburg, Virginia 24061, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Alanine glyoxylate aminotransferase
A, B
393Aedes aegyptiMutation(s): 1 
Find proteins for Q3LSM4 (Aedes aegypti)
Explore Q3LSM4 
Go to UniProtKB:  Q3LSM4
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ3LSM4
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on LLP
A, B
Experimental Data & Validation

Experimental Data

  • Resolution: 1.75 Å
  • R-Value Free: 0.203 
  • R-Value Work: 0.172 
  • R-Value Observed: 0.174 
  • Space Group: H 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 136.964α = 90
b = 136.964β = 90
c = 120.473γ = 120
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-09-26
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2023-08-30
    Changes: Data collection, Database references, Derived calculations, Refinement description
  • Version 1.4: 2023-11-15
    Changes: Data collection