Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Standalone Viewers  
Protein Workshop | Ligand Explorer

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 42210.16 
• Atom Count: 2960 
• Residue Count: 364 
• Unique protein chains: 1

1HKK

High resoultion crystal structure of human chitinase in complex with allosamidin

• DOI: 10.2210/pdb1HKK/pdb

• Classification: HYDROLASE
• Organism(s): Homo sapiens


• Deposited: 2003-03-10 Released: 2004-03-11 
• Deposition Author(s): Rao, F.V., Houston, D.R., Boot, R.G., Aerts, J.M.F.G., Sakuda, S., Van Aalten, D.M.F.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.85 Å
• R-Value Free: 0.189 
• R-Value Work: 0.179 

Literature

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

• PubMed: 12639956 
• DOI: 10.1074/jbc.M300362200
• Primary Citation of Related Structures:  
  1HKM, 1HKJ, 1HKI


• 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.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
CHITOTRIOSIDASE-1	A	364	Homo sapiens	Mutation(s): 0  Gene Names: CHIT1 EC: 3.2.1.14
Find proteins for Q13231 (Homo sapiens) Go to Gene View: CHIT1 Go to UniProtKB:  Q13231

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
ZN	A	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N
NAA	A	N-ACETYL-D-ALLOSAMINE C8 H15 N O6 OVRNDRQMDRJTHS-UIAUGNHASA-N
AMI	A	ALLOSAMIZOLINE C9 H16 N2 O4 MKJAYSJDHSEFRI-PVFLNQBWSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.85 Å
• R-Value Free: 0.189 
• R-Value Work: 0.179 
• Space Group: P 4₃ 2₁ 2

Unit Cell:

Length (Å)	Angle (°)
a = 94.858	α = 90.00
b = 94.858	β = 90.00
c = 83.483	γ = 90.00

Software Package:

Software Name	Purpose
SCALEPACK	data scaling
DENZO	data reduction
CNS	refinement
AMoRE	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2003-03-10 
• Released Date: 2004-03-11 
• Deposition Author(s): Rao, F.V., Houston, D.R., Boot, R.G., Aerts, J.M.F.G., Sakuda, S., Van Aalten, D.M.F.

Revision History 

• Version 1.0: 2004-03-11
  Type: Initial release
• Version 1.1: 2011-05-08
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance