1M6J

CRYSTAL STRUCTURE OF TRIOSEPHOSPHATE ISOMERASE FROM ENTAMOEBA HISTOLYTICA

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.206 
  • R-Value Work: 0.184 
  • R-Value Observed: 0.184 

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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

  • DOI: 10.1016/s0022-2836(02)00809-4
  • Primary Citation of Related Structures:  
    1M6J

  • 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. TIMs lacking this residue, such as human TIM, are less affected ...

    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
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(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Triosephosphate IsomeraseA, B261Entamoeba histolyticaMutation(s): 0 
Gene Names: TPI
EC: 5.3.1.1
UniProt
Find proteins for O02611 (Entamoeba histolytica)
Explore O02611 
Go to UniProtKB:  O02611
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO02611
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.206 
  • R-Value Work: 0.184 
  • R-Value Observed: 0.184 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 85.729α = 90
b = 119.947β = 90
c = 50.392γ = 90
Software Package:
Software NamePurpose
CNSrefinement
MOSFLMdata reduction
CCP4data scaling
CNSphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

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