1W7L

Crystal structure of human kynurenine aminotransferase I


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.193 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Crystal Structure of Human Kynurenine Aminotransferase I

Rossi, F.Han, Q.Li, J.Li, J.Rizzi, M.

(2004) J Biol Chem 279: 50214

  • DOI: 10.1074/jbc.M409291200
  • Primary Citation of Related Structures:  
    1W7N, 1W7M, 1W7L

  • PubMed Abstract: 
  • The kynurenine pathway has long been regarded as a valuable target for the treatment of several neurological disorders accompanied by unbalanced levels of metabolites along the catabolic cascade, kynurenic acid among them. The irreversible transamina ...

    The kynurenine pathway has long been regarded as a valuable target for the treatment of several neurological disorders accompanied by unbalanced levels of metabolites along the catabolic cascade, kynurenic acid among them. The irreversible transamination of kynurenine is the sole source of kynurenic acid, and it is catalyzed by different isoforms of the 5'-pyridoxal phosphate-dependent kynurenine aminotransferase (KAT). The KAT-I isozyme has also been reported to possess beta-lyase activity toward several sulfur- and selenium-conjugated molecules, leading to the proposal of a role of the enzyme in carcinogenesis associated with environmental pollutants. We solved the structure of human KAT-I in its 5'-pyridoxal phosphate and pyridoxamine phosphate forms and in complex with the competing substrate l-Phe. The enzyme active site revealed a striking crown of aromatic residues decorating the ligand binding pocket, which we propose as a major molecular determinant for substrate recognition. Ligand-induced conformational changes affecting Tyr(101) and the Trp(18)-bearing alpha-helix H1 appear to play a central role in catalysis. Our data reveal a key structural role of Glu(27), providing a molecular basis for the reported loss of enzymatic activity displayed by the equivalent Glu --> Gly mutation in KAT-I of spontaneously hypertensive rats.


    Organizational Affiliation

    Dipartimento di Scienze Chimiche, Alimentari, Farmaceutiche, Farmacologiche-Istituto Nazionale di Fisica della Materia, University of Piemonte Orientale "Amedeo Avogadro," Via Bovio 6, 28100 Novara, Italy.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
KYNURENINE--OXOGLUTARATE TRANSAMINASE IA422Homo sapiensMutation(s): 0 
Gene Names: KYAT1CCBL1
EC: 4.4.1.13 (PDB Primary Data), 2.6.1.7 (UniProt), 2.6.1.64 (UniProt)
Find proteins for Q16773 (Homo sapiens)
Explore Q16773 
Go to UniProtKB:  Q16773
NIH Common Fund Data Resources
PHAROS  Q16773
Protein Feature View
Expand
 ( Mouse scroll to zoom / Hold left click to move )
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PLP
Query on PLP

Download CCD File 
A
PYRIDOXAL-5'-PHOSPHATE
C8 H10 N O6 P
NGVDGCNFYWLIFO-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.193 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 146.372α = 90
b = 146.372β = 90
c = 67.449γ = 120
Software Package:
Software NamePurpose
REFMACrefinement

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-09-08
    Type: Initial release
  • Version 1.1: 2015-09-16
    Changes: Database references, Derived calculations, Non-polymer description, Other, Source and taxonomy, Structure summary, Version format compliance
  • Version 1.2: 2015-12-23
    Changes: Atomic model, Derived calculations, Non-polymer description, Other, Structure summary