1M6J

CRYSTAL STRUCTURE OF TRIOSEPHOSPHATE ISOMERASE FROM ENTAMOEBA HISTOLYTICA


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.5 Å
  • R-Value Free: 0.206 
  • R-Value Work: 0.184 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structure and Inactivation of Triosephosphate Isomerase from Entamoeba histolytica

Rodriguez-Romero, A.Hernandez-Santoyo, A.Del Pozo-Yauner, L.Kornhauser, A.Fernandez-Velasco, D.A.

(2002) J.Mol.Biol. 322: 669-675


  • PubMed Abstract: 
  • Triosephosphate isomerase (TIM) has been proposed as a target for drug design. TIMs from several parasites have a cysteine residue at the dimer interface, whose derivatization with thiol-specific reagents induces enzyme inactivation and aggregation. ...

    Triosephosphate isomerase (TIM) has been proposed as a target for drug design. TIMs from several parasites have a cysteine residue at the dimer interface, whose derivatization with thiol-specific reagents induces enzyme inactivation and aggregation. TIMs lacking this residue, such as human TIM, are less affected. TIM from Entamoeba histolytica (EhTIM) has the interface cysteine residue and presents more than ten insertions when compared with the enzyme from other pathogens. To gain further insight into the role that interface residues play in the stability and reactivity of these enzymes, we determined the high-resolution structure and characterized the effect of methylmethane thiosulfonate (MMTS) on the activity and conformational properties of EhTIM. The structure of this enzyme was determined at 1.5A resolution using molecular replacement, observing that the dimer is not symmetric. EhTIM is completely inactivated by MMTS, and dissociated into stable monomers that possess considerable secondary structure. Structural and spectroscopic analysis of EhTIM and comparison with TIMs from other pathogens reveal that conformational rearrangements of the interface after dissociation, as well as intramonomeric contacts formed by the inserted residues, may contribute to the unusual stability of the derivatized EhTIM monomer.


    Related Citations: 
    • Sequencing, Expression and Properties of Triosephosphate Isomerase from Entamoeba histolytica
      Landa, A.,Rojo-Dominguez, A.,Jimenez, A.,Fernandez-Velasco, D.A.
      (1997) Eur.J.Biochem. 247: 348


    Organizational Affiliation

    Laboratorio Universitario de Estructura de Proteínas and Departamento de Bioquímica, Instituto de Química, Universidad Nacional Autónoma de México, DF, Mexico. adela@servidor.unam.mx




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Triosephosphate Isomerase
A, B
261Entamoeba histolyticaGene Names: TPI
EC: 5.3.1.1
Find proteins for O02611 (Entamoeba histolytica)
Go to UniProtKB:  O02611
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.5 Å
  • R-Value Free: 0.206 
  • R-Value Work: 0.184 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 85.729α = 90.00
b = 119.947β = 90.00
c = 50.392γ = 90.00
Software Package:
Software NamePurpose
MOSFLMdata reduction
CCP4data scaling
CNSrefinement
CNSphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-10-12
    Type: Initial release
  • Version 1.1: 2008-04-28
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance