Crystal structure of immunomodulatory active chitinase from Trichuris suis - TsES1 - 6 molecules in ASU

Experimental Data Snapshot

  • Resolution: 2.69 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.193 
  • R-Value Observed: 0.193 

Starting Model: experimental
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A Helminth-Derived Chitinase Structurally Similar to Mammalian Chitinase Displays Immunomodulatory Properties in Inflammatory Lung Disease.

Ebner, F.Lindner, K.Janek, K.Niewienda, A.Malecki, P.H.Weiss, M.S.Sutherland, T.E.Heuser, A.Kuhl, A.A.Zentek, J.Hofmann, A.Hartmann, S.

(2021) J Immunol Res 2021: 6234836-6234836

  • DOI: https://doi.org/10.1155/2021/6234836
  • Primary Citation of Related Structures:  
    6G9C, 6G9E

  • PubMed Abstract: 

    Immunomodulation of airway hyperreactivity by excretory-secretory (ES) products of the first larval stage (L1) of the gastrointestinal nematode Trichuris suis is reported by us and others. Here, we aimed to identify the proteins accounting for the modulatory effects of the T. suis L1 ES proteins and studied six selected T. suis L1 proteins for their immunomodulatory efficacy in a murine OVA-induced allergic airway disease model. In particular, an enzymatically active T. suis chitinase mediated amelioration of clinical signs of airway hyperreactivity, primarily associated with suppression of eosinophil recruitment into the lung, the associated chemokines, and increased numbers of RELM α + interstitial lung macrophages. While there is no indication of T. suis chitinase directly interfering with dendritic cell activation or antigen presentation to CD4 T cells, treatment of allergic mice with the worm chitinase influenced the hosts' own chitinase activity in the inflamed lung. The three-dimensional structure of the T. suis chitinase as determined by high-resolution X-ray crystallography revealed high similarities to mouse acidic mammalian chitinase (AMCase) but a unique ability of T. suis chitinase to form dimers. Our data indicate that the structural similarities between the parasite and host chitinase contribute to the disease-ameliorating effect of the helminth-derived chitinase on allergic lung inflammation.

  • Organizational Affiliation

    Institute of Immunology, Department of Veterinary Medicine, Freie Universität Berlin, Berlin, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Immunomodulatory active chitinase
A, B, C, D, E
A, B, C, D, E, F
495Trichuris suisMutation(s): 0 
Gene Names: M513_10624
Find proteins for A0A085LU44 (Trichuris suis)
Explore A0A085LU44 
Go to UniProtKB:  A0A085LU44
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A085LU44
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.69 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.193 
  • R-Value Observed: 0.193 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 220.063α = 90
b = 172.618β = 128.41
c = 138.564γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
Aimlessdata scaling
PDB_EXTRACTdata extraction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2019-04-24
    Type: Initial release
  • Version 1.1: 2022-12-21
    Changes: Database references, Derived calculations
  • Version 1.2: 2024-01-31
    Changes: Data collection, Refinement description