2XTK

ChiA1 from Aspergillus fumigatus in complex with acetazolamide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.216 
  • R-Value Observed: 0.218 

Starting Model: other
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wwPDB Validation   3D Report Full Report


Ligand Structure Quality Assessment 


This is version 1.3 of the entry. See complete history


Literature

Acetazolamide-Based Fungal Chitinase Inhibitors.

Schuttelkopf, A.W.Gros, L.Blair, D.E.Frearson, J.A.Van Aalten, D.M.F.Gilbert, I.H.

(2010) Bioorg Med Chem 18: 8334

  • DOI: https://doi.org/10.1016/j.bmc.2010.09.062
  • Primary Citation of Related Structures:  
    2XTK

  • PubMed Abstract: 

    Chitin is an essential structural component of the fungal cell wall. Chitinases are thought to be important for fungal cell wall remodelling, and inhibition of these enzymes has been proposed as a potential strategy for development of novel anti-fungals. The fungal pathogen Aspergillus fumigatus possesses two distinct multi-gene chitinase families. Here we explore acetazolamide as a chemical scaffold for the inhibition of an A. fumigatus 'plant-type' chitinase. A co-crystal structure of AfChiA1 with acetazolamide was used to guide synthesis and screening of acetazolamide analogues that yielded SAR in agreement with these structural data. Although acetazolamide and its analogues are weak inhibitors of the enzyme, they have a high ligand efficiency and as such are interesting leads for future inhibitor development.


  • Organizational Affiliation

    University of Dundee, Sir James Black Centre, UK.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
CLASS III CHITINASE CHIA1
A, B
310Aspergillus fumigatus A1163Mutation(s): 0 
EC: 3.2.1.14
UniProt
Find proteins for B0Y2Y2 (Aspergillus fumigatus (strain CBS 144.89 / FGSC A1163 / CEA10))
Explore B0Y2Y2 
Go to UniProtKB:  B0Y2Y2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupB0Y2Y2
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
AZM
Query on AZM

Download Ideal Coordinates CCD File 
C [auth A],
L [auth B]
5-ACETAMIDO-1,3,4-THIADIAZOLE-2-SULFONAMIDE
C4 H6 N4 O3 S2
BZKPWHYZMXOIDC-UHFFFAOYSA-N
PO4
Query on PO4

Download Ideal Coordinates CCD File 
D [auth A]
E [auth A]
F [auth A]
G [auth A]
H [auth A]
D [auth A],
E [auth A],
F [auth A],
G [auth A],
H [auth A],
I [auth A],
J [auth A],
K [auth A],
M [auth B],
N [auth B],
O [auth B],
P [auth B],
Q [auth B],
R [auth B],
S [auth B],
T [auth B]
PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
Binding Affinity Annotations 
IDSourceBinding Affinity
AZM BindingDB:  2XTK IC50: 1.64e+5 (nM) from 1 assay(s)
PDBBind:  2XTK IC50: 1.64e+5 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.216 
  • R-Value Observed: 0.218 
  • Space Group: I 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 76.638α = 90
b = 125.831β = 90
c = 211.688γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
DENZOdata reduction
SCALEPACKdata 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: 2011-10-26
    Type: Initial release
  • Version 1.1: 2012-08-29
    Changes: Database references
  • Version 1.2: 2024-05-01
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description
  • Version 1.3: 2024-11-13
    Changes: Structure summary