High resolution crystal structure of human kynurenine aminotransferase-I in complex with aminooxyacetate

Experimental Data Snapshot

  • Resolution: 1.54 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.199 

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High resolution crystal structures of human kynurenine aminotransferase-I bound to PLP cofactor, and in complex with aminooxyacetate.

Nadvi, N.A.Salam, N.K.Park, J.Akladios, F.N.Kapoor, V.Collyer, C.A.Gorrell, M.D.Church, W.B.

(2017) Protein Sci 26: 727-736

  • DOI: https://doi.org/10.1002/pro.3119
  • Primary Citation of Related Structures:  
    4WLH, 4WLJ

  • PubMed Abstract: 

    In this study, we report two high-resolution structures of the pyridoxal 5' phosphate (PLP)-dependent enzyme kynurenine aminotransferase-I (KAT-I). One is the native structure with the cofactor in the PLP form bound to Lys247 with the highest resolution yet available for KAT-I at 1.28 Å resolution, and the other with the general PLP-dependent aminotransferase inhibitor, aminooxyacetate (AOAA) covalently bound to the cofactor at 1.54 Å. Only small conformational differences are observed in the vicinity of the aldimine (oxime) linkage with which the PLP forms the Schiff base with Lys247 in the 1.28 Å resolution native structure, in comparison to other native PLP-bound structures. We also report the inhibition of KAT-1 by AOAA and aminooxy-phenylpropionic acid (AOPP), with IC50s of 13.1 and 5.7 μM, respectively. The crystal structure of the enzyme in complex with the inhibitor AOAA revealed that the cofactor is the PLP form with the external aldimine linkage. The location of this oxime with the PLP, which forms in place of the native internal aldimine linkage of PLP of the native KAT-I, is away from the position of the native internal aldimine, with the free Lys247 substantially retaining the orientation of the native structure. Tyr101, at the active site, was observed in two conformations in both structures.

  • Organizational Affiliation

    School of Molecular Bioscience, University of Sydney, Sydney, New South Wales, Australia.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Kynurenine--oxoglutarate transaminase 1
A, B
422Homo sapiensMutation(s): 0 
Gene Names: CCBL1
EC: (PDB Primary Data), (PDB Primary Data), (PDB Primary Data)
UniProt & NIH Common Fund Data Resources
Find proteins for Q16773 (Homo sapiens)
Explore Q16773 
Go to UniProtKB:  Q16773
GTEx:  ENSG00000171097 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ16773
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on IK2

Download Ideal Coordinates CCD File 
C [auth A],
D [auth B]
C10 H15 N2 O8 P
Experimental Data & Validation

Experimental Data

  • Resolution: 1.54 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.199 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 102.74α = 90
b = 107.65β = 112.98
c = 81.75γ = 90
Software Package:
Software NamePurpose
Blu-Icedata collection
PDB_EXTRACTdata extraction
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-12-03
    Type: Initial release
  • Version 1.1: 2017-05-31
    Changes: Database references
  • Version 1.2: 2023-09-27
    Changes: Advisory, Data collection, Database references, Refinement description