1MS9

Triclinic form of Trypanosoma cruzi trans-sialidase, in complex with lactose


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.58 Å
  • R-Value Free: 0.198 
  • R-Value Work: 0.163 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The crystal structure and mode of action of trans-sialidase, a key enzyme of Trypanosoma cruzi pathogenesis

Buschiazzo, A.Amaya, M.F.Cremona, M.L.Frasch, A.C.Alzari, P.M.

(2002) Mol.Cell 10: 757-768

  • Primary Citation of Related Structures:  1MR5, 1MS0, 1MS1, 1MS3, 1MS4, 1MS5, 1MS8

  • PubMed Abstract: 
  • Trans-sialidases (TS) are GPI-anchored surface enzymes expressed in specific developmental stages of trypanosome parasites like Trypanosoma cruzi, the etiologic agent of Chagas disease, and T. brucei, the causative agent of sleeping sickness. TS cata ...

    Trans-sialidases (TS) are GPI-anchored surface enzymes expressed in specific developmental stages of trypanosome parasites like Trypanosoma cruzi, the etiologic agent of Chagas disease, and T. brucei, the causative agent of sleeping sickness. TS catalyzes the transfer of sialic acid residues from host to parasite glycoconjugates through a transglycosidase reaction that appears to be critical for T. cruzi survival and cell invasion capability. We report here the structure of the T. cruzi trans-sialidase, alone and in complex with sugar ligands. Sialic acid binding is shown to trigger a conformational switch that modulates the affinity for the acceptor substrate and concomitantly creates the conditions for efficient transglycosylation. The structure provides a framework for the structure-based design of novel inhibitors with potential therapeutic applications.


    Organizational Affiliation

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
trans-sialidase
A, B
648Trypanosoma cruziN/A
Find proteins for Q26966 (Trypanosoma cruzi)
Go to UniProtKB:  Q26966
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
LAT
Query on LAT

Download SDF File 
Download CCD File 
A, B
BETA-LACTOSE
C12 H22 O11
GUBGYTABKSRVRQ-DCSYEGIMSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.58 Å
  • R-Value Free: 0.198 
  • R-Value Work: 0.163 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 51.046α = 86.02
b = 74.204β = 84.17
c = 87.496γ = 88.31
Software Package:
Software NamePurpose
AMoREphasing
MOSFLMdata reduction
CCP4data scaling
SCALAdata scaling
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-03-25
    Type: Initial release
  • Version 1.1: 2008-04-28
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Non-polymer description, Version format compliance