Acidic Mammalian Chinase, Catalytic Domain

Experimental Data Snapshot

  • Resolution: 2.00 Å
  • R-Value Free: 0.228 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.199 

wwPDB Validation   3D Report Full Report

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Triad of polar residues implicated in pH specificity of acidic mammalian chitinase.

Olland, A.M.Strand, J.Presman, E.Czerwinski, R.Joseph-McCarthy, D.Krykbaev, R.Schlingmann, G.Chopra, R.Lin, L.Fleming, M.Kriz, R.Stahl, M.Somers, W.Fitz, L.Mosyak, L.

(2009) Protein Sci 18: 569-578

  • DOI: https://doi.org/10.1002/pro.63
  • Primary Citation of Related Structures:  
    3FXY, 3FY1

  • PubMed Abstract: 

    Acidic mammalian chitinase (AMCase) is a mammalian chitinase that has been implicated in allergic asthma. One of only two active mammalian chinases, AMCase, is distinguished from other chitinases by several unique features. Here, we present the novel structure of the AMCase catalytic domain, both in the apo form and in complex with the inhibitor methylallosamidin, determined to high resolution by X-ray crystallography. These results provide a structural basis for understanding some of the unique characteristics of this enzyme, including the low pH optimum and the preference for the beta-anomer of the substrate. A triad of polar residues in the second-shell is found to modulate the highly conserved chitinase active site. As a novel target for asthma therapy, structural details of AMCase activity will help guide the future design of specific and potent AMCase inhibitors.

  • Organizational Affiliation

    Department of Chemical and Screening Sciences, Structural Biology and Computational Chemistry, Wyeth Research, Cambridge, Massachusetts 02140, USA. aolland@wyeth.com

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Acidic mammalian chitinase
A, B, C, D
395Homo sapiensMutation(s): 1 
Gene Names: CHIA
UniProt & NIH Common Fund Data Resources
Find proteins for Q9BZP6 (Homo sapiens)
Explore Q9BZP6 
Go to UniProtKB:  Q9BZP6
GTEx:  ENSG00000134216 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9BZP6
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.00 Å
  • R-Value Free: 0.228 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.199 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 69.941α = 90
b = 92.36β = 95.92
c = 111.669γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

  • Released Date: 2009-03-10 
  • Deposition Author(s): Olland, A.M.

Revision History  (Full details and data files)

  • Version 1.0: 2009-03-10
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance