1YIY

Aedes aegypti kynurenine aminotransferase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Work: 0.218 

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This is version 1.2 of the entry. See complete history


Literature

Crystal structures of Aedes aegypti kynurenine aminotransferase.

Han, Q.Gao, Y.G.Robinson, H.Ding, H.Wilson, S.Li, J.

(2005) FEBS J 272: 2198-2206

  • DOI: 10.1111/j.1742-4658.2005.04643.x
  • Primary Citation of Related Structures:  
    1YIZ, 1YIY

  • PubMed Abstract: 
  • Aedes aegypti kynurenine aminotransferase (AeKAT) catalyzes the irreversible transamination of kynurenine to kynurenic acid, the natural antagonist of NMDA and 7-nicotinic acetycholine receptors. Here, we report the crystal structure of AeKAT in its PMP and PLP forms at 1 ...

    Aedes aegypti kynurenine aminotransferase (AeKAT) catalyzes the irreversible transamination of kynurenine to kynurenic acid, the natural antagonist of NMDA and 7-nicotinic acetycholine receptors. Here, we report the crystal structure of AeKAT in its PMP and PLP forms at 1.90 and 1.55 A, respectively. The structure was solved by a combination of single-wavelength anomalous dispersion and molecular replacement approaches. The initial search model in the molecular replacement method was built with the result of single-wavelength anomalous dispersion data from the Br-AeKAT crystal in combination with homology modeling. The solved structure shows that the enzyme is a homodimer, and that the two subunits are stabilized by a number of hydrogen bonds, salts bridges, and hydrophobic interactions. Each subunit is divided into an N-terminal arm and small and large domains. Based on its folding, the enzyme belongs to the prototypical fold type, aminotransferase subgroup I. The three-dimensional structure shows a strictly conserved 'PLP-phosphate binding cup' featuring PLP-dependent enzymes. The interaction between Cys284 (A) and Cys284 (B) is unique in AeKAT, which might explain the cysteine effect of AeKAT activity. Further mutation experiments of this residue are needed to eventually understand the mechanism of the enzyme modulation by cysteine.


    Organizational Affiliation

    Department of Pathobiology, University of Illinois, Urbana, IL 61802, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
kynurenine aminotransferase; glutamine transaminase KA, B429Aedes aegyptiMutation(s): 0 
Gene Names: KAT5564787AAEL004435
EC: 2.6.1.7 (PDB Primary Data), 2.6.1.64 (PDB Primary Data), 2.6.1.63 (UniProt), 4.4.1.13 (UniProt)
UniProt
Find proteins for Q17CS8 (Aedes aegypti)
Explore Q17CS8 
Go to UniProtKB:  Q17CS8
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Work: 0.218 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 55.358α = 90
b = 95.316β = 90
c = 167.674γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
SCALEPACKdata scaling
AMoREphasing
SHELXL-97refinement
HKL-2000data reduction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-05-10
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance