Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report | Ligand Interaction

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 86.93 kDa 
• Atom Count: 6486 
• Modelled Residue Count: 770 
• Deposited Residue Count: 786 
• Unique protein chains: 1

2HUF

Crystal structure of Aedes aegypti alanine glyoxylate aminotransferase

• PDB DOI: 10.2210/pdb2HUF/pdb

• Classification: TRANSFERASE
• Organism(s): Aedes aegypti
• Expression System: Spodoptera frugiperda
• Mutation(s): Yes 


• Deposited: 2006-07-26 Released: 2006-09-26 
• Deposition Author(s): Han, Q., Robinson, H., Gao, Y.G., Vogelaar, N., Wilson, S.R., Rizzi, M., Li, J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.75 Å
• R-Value Free: 0.203 
• R-Value Work: 0.172 
• R-Value Observed: 0.174 

Literature

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

• PubMed: 16990263 
• DOI: 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.

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Organizational Affiliation: 

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

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Alanine glyoxylate aminotransferase	A, B	393	Aedes aegypti	Mutation(s): 1  Gene Names: 5573438, AAEL010480 EC: 2.6.1.44 (PDB Primary Data), 2.6.1.51 (UniProt)
UniProt
Find proteins for Q3LSM4 (Aedes aegypti) Explore Q3LSM4  Go to UniProtKB:  Q3LSM4

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
1BO	C [auth A], D [auth B]	1-BUTANOL C4 H10 O LRHPLDYGYMQRHN-UHFFFAOYSA-N

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
LLP	A, B	L-PEPTIDE LINKING	C14 H22 N3 O7 P		LYS

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• 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 = 136.964	α = 90
b = 136.964	β = 90
c = 120.473	γ = 120

Software Package:

Software Name	Purpose
REFMAC	refinement
HKL-2000	data reduction
HKL-2000	data scaling
MOLREP	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2006-07-26 
• Released Date: 2006-09-26 
Deposition Author(s): Han, Q., Robinson, H., Gao, Y.G., Vogelaar, N., Wilson, S.R., Rizzi, M., Li, J.

Revision History  

• 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