2A3A

Crystal structure of Aspergillus fumigatus chitinase B1 in complex with theophylline

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.187 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history. 


Literature

Methylxanthine drugs are chitinase inhibitors: investigation of inhibition and binding modes.

Rao, F.V., Andersen, O.A., Vora, K.A., Demartino, J.A., van Aalten, D.M.

(2005) Chem Biol 12: 973-980

  • DOI: 10.1016/j.chembiol.2005.07.009
  • Primary Citation of Related Structures:  
    2A3C, 2A3B, 2A3A, 2A3E

  • PubMed Abstract: 

    • Family 18 chitinases play key roles in a range of pathogenic organisms and are overexpressed in the asthmatic lung. By screening a library of marketed drug molecules, we have identified methylxanthine derivatives as possible inhibitor leads. These de ...

    Family 18 chitinases play key roles in a range of pathogenic organisms and are overexpressed in the asthmatic lung. By screening a library of marketed drug molecules, we have identified methylxanthine derivatives as possible inhibitor leads. These derivatives, theophylline, caffeine, and pentoxifylline, are used therapeutically as antiinflammatory agents, with pleiotropic mechanisms of action. Here it is shown that they are also competitive inhibitors against a fungal family 18 chitinase, with pentoxifylline being the most potent (K(i) of 37 microM). Crystallographic analysis of chitinase-inhibitor complexes revealed specific interactions with the active site, mimicking the reaction intermediate analog, allosamidin. Mutagenesis identified the key active site residues, conserved in mammalian chitinases, which contribute to inhibitor affinity. Enzyme assays also revealed that these methylxanthines are active against human chitinases.

    Organizational Affiliation: 

    Division of Biological Chemistry and Molecular Microbiology, School of Life Sciences, University of Dundee, Scotland.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
chitinaseA, B433Aspergillus fumigatusMutation(s): 0 
Gene Names: chiB1
EC: 3.2.1.14
Find proteins for Q873X9 (Neosartorya fumigata)
Explore Q873X9 
Go to UniProtKB:  Q873X9
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
TEP
Query on TEP
Download CCD File 
A, B
THEOPHYLLINE
C7 H8 N4 O2
ZFXYFBGIUFBOJW-UHFFFAOYSA-N		 Ligand Interaction
SO4
Query on SO4
Download CCD File 
A, B
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L		 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
TEPIC50:  1500000   nM  Binding MOAD
TEPIC50:  1500000   nM  BindingDB
TEPIC50 :  1500000   nM  PDBBind
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.187 
  • Space Group: P 41
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 117.229α = 90
b = 117.229β = 90
c = 100.021γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
PHASESphasing
CNSrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-09-27
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance