Crystal structure of human chitinase in complex with methylallosamidin

Experimental Data Snapshot

  • Resolution: 2.60 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.211 
  • R-Value Observed: 0.211 

Starting Model: experimental
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Crystal Structures of Allosamidin Derivatives in Complex with Human Macrophage Chitinase

Rao, F.V.Houston, D.R.Boot, R.G.Aerts, J.M.F.G.Sakuda, S.Van Aalten, D.M.F.

(2003) J Biol Chem 278: 20110

  • DOI: https://doi.org/10.1074/jbc.M300362200
  • Primary Citation of Related Structures:  
    1HKI, 1HKJ, 1HKK, 1HKM

  • PubMed Abstract: 

    The pseudotrisaccharide allosamidin is a potent family 18 chitinase inhibitor with demonstrated biological activity against insects, fungi, and the Plasmodium falciparum life cycle. The synthesis and biological properties of several derivatives have been reported. The structural interactions of allosamidin with several family 18 chitinases have been determined by x-ray crystallography previously. Here, a high resolution structure of chitotriosidase, the human macrophage chitinase, in complex with allosamidin is presented. In addition, complexes of the allosamidin derivatives demethylallosamidin, methylallosamidin, and glucoallosamidin B are described, together with their inhibitory properties. Similar to other chitinases, inhibition of the human chitinase by allosamidin derivatives lacking a methyl group is 10-fold stronger, and smaller effects are observed for the methyl and C3 epimer derivatives. The structures explain the effects on inhibition in terms of altered hydrogen bonding and hydrophobic interactions, together with displaced water molecules. The data reported here represent a first step toward structure-based design of specific allosamidin derivatives.

  • Organizational Affiliation

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

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
CHITOTRIOSIDASE365Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for Q13231 (Homo sapiens)
Explore Q13231 
Go to UniProtKB:  Q13231
GTEx:  ENSG00000133063 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ13231
Sequence Annotations
  • Reference Sequence


Entity ID: 2
MoleculeChains Length2D Diagram Glycosylation3D Interactions
Glycosylation Resources
GlyTouCan:  G49898TV
GlyCosmos:  G49898TV
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on AMI

Download Ideal Coordinates CCD File 
C9 H16 N2 O4
Experimental Data & Validation

Experimental Data

  • Resolution: 2.60 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.211 
  • R-Value Observed: 0.211 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 93.99α = 90
b = 93.99β = 90
c = 87.086γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-03-11
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2019-07-24
    Changes: Advisory, Data collection, Derived calculations
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Atomic model, Data collection, Derived calculations, Other, Structure summary
  • Version 2.1: 2023-12-13
    Changes: Advisory, Data collection, Database references, Derived calculations, Refinement description, Structure summary