2VGZ

CRYSTAL STRUCTURE OF HUMAN KYNURENINE AMINOTRANSFERASE II


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.182 
  • R-Value Observed: 0.185 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Crystal Structure of Human Kynurenine Aminotransferase II, a Drug Target for the Treatment of Schizophrenia.

Rossi, F.Garavaglia, S.Montalbano, V.Walsh, M.A.Rizzi, M.

(2008) J Biol Chem 283: 3559

  • DOI: 10.1074/jbc.M707925200
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Kynurenic acid is an endogenous neuroactive compound whose unbalancing is involved in the pathogenesis and progression of several neurological diseases. Kynurenic acid synthesis in the human brain is sustained by the catalytic activity of two kynuren ...

    Kynurenic acid is an endogenous neuroactive compound whose unbalancing is involved in the pathogenesis and progression of several neurological diseases. Kynurenic acid synthesis in the human brain is sustained by the catalytic activity of two kynurenine aminotransferases, hKAT I and hKAT II. A wealth of pharmacological data highlight hKAT II as a sensible target for the treatment of neuropathological conditions characterized by a kynurenic acid excess, such as schizophrenia and cognitive impairment. We have solved the structure of human KAT II by means of the single-wavelength anomalous dispersion method at 2.3-A resolution. Although closely resembling the classical aminotransferase fold, the hKAT II architecture displays unique features. Structural comparison with a prototypical aspartate aminotransferase reveals a novel antiparallel strand-loop-strand motif that forms an unprecedented intersubunit beta-sheet in the functional hKAT II dimer. Moreover, the N-terminal regions of hKAT II and aspartate aminotransferase appear to have converged to highly similar although 2-fold symmetry-related conformations, which fulfill the same functional role. A detailed structural comparison of hKAT I and hKAT II reveals a larger and more aliphatic character to the active site of hKAT II due to the absence of the aromatic cage involved in ligand binding in hKAT I. The observed structural differences could be exploited for the rational design of highly selective hKAT II inhibitors.


    Organizational Affiliation

    DiSCAFF-INFM, University of Piemonte Orientale A. Avogadro, 28100 Novara, Italy.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
KYNURENINE/ALPHA-AMINOADIPATE AMINOTRANSFERASE
A, B
427HOMO SAPIENSMutation(s): 0 
Gene Names: AADATKAT2
EC: 2.6.1.39 (PDB Primary Data), 2.6.1.7 (PDB Primary Data)
Find proteins for Q8N5Z0 (Homo sapiens)
Go to UniProtKB:  Q8N5Z0
NIH Common Fund Data Resources
PHAROS  Q8N5Z0
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PLP
Query on PLP

Download CCD File 
A, B
PYRIDOXAL-5'-PHOSPHATE
C8 H10 N O6 P
NGVDGCNFYWLIFO-UHFFFAOYSA-N
 Ligand Interaction
IOD
Query on IOD

Download CCD File 
A
IODIDE ION
I
XMBWDFGMSWQBCA-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.182 
  • R-Value Observed: 0.185 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 99.631α = 90
b = 154.956β = 90
c = 61.201γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling
SHELX-SHARPphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-12-04
    Type: Initial release
  • Version 1.1: 2015-12-09
    Changes: Atomic model, Database references, Derived calculations, Non-polymer description, Other, Structure summary, Version format compliance