Trypanosoma cruzi trans-sialidase in complex with MuNANA (Michaelis complex)

Experimental Data Snapshot

  • Resolution: 1.65 Å
  • R-Value Free: 0.194 
  • R-Value Work: 0.162 
  • R-Value Observed: 0.163 

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This is version 1.4 of the entry. See complete history


Structural Insights into the Catalytic Mechanism of Trypanosoma cruzi trans-Sialidase.

Amaya, M.F.Watts, A.G.Damager, I.Wehenkel, A.Nguyen, T.Buschiazzo, A.Paris, G.Frasch, A.C.Withers, S.G.Alzari, P.M.

(2004) Structure 12: 775-784

  • DOI: https://doi.org/10.1016/j.str.2004.02.036
  • Primary Citation of Related Structures:  
    1S0I, 1S0J, 2AH2

  • PubMed Abstract: 

    Sialidases are a superfamily of sialic-acid-releasing enzymes that are of significant interest due to their implication as virulence factors in the pathogenesis of a number of diseases. However, extensive studies of viral and microbial sialidases have failed to provide a comprehensive picture of their mechanistic properties, in part because the structures of competent enzyme-substrate complexes and reaction intermediates have never been described. Here we report these structures for the Trypanosoma cruzi trans-sialidase (TcTS), showing that catalysis by sialidases occurs via a similar mechanism to that of other retaining glycosidases, but with some intriguing differences that may have evolved in response to the substrate structure.

  • Organizational Affiliation

    Unité de Biochimie Structurale, CNRS URA 2185, Institut Pasteur, 25 rue du Dr. Roux, 75724 Paris, France.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
trans-sialidase648Trypanosoma cruziMutation(s): 8 
Find proteins for Q26966 (Trypanosoma cruzi)
Explore Q26966 
Go to UniProtKB:  Q26966
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ26966
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on MUS

Download Ideal Coordinates CCD File 
C21 H25 N O11
Experimental Data & Validation

Experimental Data

  • Resolution: 1.65 Å
  • R-Value Free: 0.194 
  • R-Value Work: 0.162 
  • R-Value Observed: 0.163 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 54.373α = 90
b = 129.423β = 108.33
c = 54.234γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-05-18
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2021-10-27
    Changes: Database references, Derived calculations
  • Version 1.4: 2023-08-23
    Changes: Data collection, Refinement description