4CZ1

Crystal structure of kynurenine formamidase from Bacillus anthracis complexed with 2-aminoacetophenone.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.24 Å
  • R-Value Free: 0.224 
  • R-Value Work: 0.184 
  • R-Value Observed: 0.186 

Starting Model: experimental
View more details

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Structure of Bacterial Kynurenine Formamidase Reveals a Crowded Binuclear-Zinc Catalytic Site Primed to Generate a Potent Nucleophile.

Diaz-Saez, L.Srikannathasan, V.Zoltner, M.Hunter, W.N.

(2014) Biochem J 462: 581

  • DOI: https://doi.org/10.1042/BJ20140511
  • Primary Citation of Related Structures:  
    4CO9, 4COB, 4COG, 4CZ1

  • PubMed Abstract: 

    Tryptophan is an important precursor for chemical entities that ultimately support the biosynthesis of key metabolites. The second stage of tryptophan catabolism is catalysed by kynurenine formamidase, an enzyme that is different between eukaryotes and prokaryotes. In the present study, we characterize the catalytic properties and present the crystal structures of three bacterial kynurenine formamidases. The structures reveal a new amidase protein fold, a highly organized and distinctive binuclear Zn2+ catalytic centre in a confined, hydrophobic and relatively rigid active site. The structure of a complex with 2-aminoacetophenone delineates aspects of molecular recognition extending to the observation that the substrate itself may be conformationally restricted to assist binding in the confined space of the active site and for subsequent processing. The cations occupy a crowded environment, and, unlike most Zn2+-dependent enzymes, there is little scope to increase co-ordination number during catalysis. We propose that the presence of a bridging water/hydroxide ligand in conjunction with the placement of an active site histidine supports a distinctive amidation mechanism.


  • Organizational Affiliation

    *Division of Biological Chemistry and Drug Discovery, College of Life Sciences, University of Dundee, Dow Street, Dundee DD1 5EH, U.K.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
KYNURENINE FORMAMIDASE
A, B, C, D
209Bacillus anthracis str. AmesMutation(s): 0 
Gene Names: KYNB
EC: 3.5.1.9
UniProt
Find proteins for Q81PP9 (Bacillus anthracis)
Explore Q81PP9 
Go to UniProtKB:  Q81PP9
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ81PP9
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
VNJ
Query on VNJ

Download Ideal Coordinates CCD File 
G [auth A]2-aminoacetophenone
C8 H9 N O
GTDQGKWDWVUKTI-UHFFFAOYSA-N
ZN
Query on ZN

Download Ideal Coordinates CCD File 
E [auth A]
F [auth A]
I [auth B]
J [auth B]
K [auth C]
E [auth A],
F [auth A],
I [auth B],
J [auth B],
K [auth C],
L [auth C],
N [auth D],
O [auth D]
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
MG
Query on MG

Download Ideal Coordinates CCD File 
H [auth A],
M [auth C],
P [auth D]
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.24 Å
  • R-Value Free: 0.224 
  • R-Value Work: 0.184 
  • R-Value Observed: 0.186 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 73.695α = 90
b = 66.561β = 90.24
c = 84.061γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
Aimlessdata scaling
MOLREPphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-04-30
    Type: Initial release
  • Version 1.1: 2014-07-02
    Changes: Atomic model, Database references, Derived calculations, Other
  • Version 1.2: 2014-09-03
    Changes: Database references
  • Version 1.3: 2019-03-06
    Changes: Data collection, Experimental preparation, Other
  • Version 1.4: 2023-12-20
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description