3PF3

Crystal structure of a mutant (C202A) of Triosephosphate isomerase from Giardia lamblia derivatized with MMTS


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.098 Å
  • R-Value Free: 0.207 
  • R-Value Work: 0.180 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Determining the molecular mechanism of inactivation by chemical modification of triosephosphate isomerase from the human parasite Giardia lamblia: A study for antiparasitic drug design.

Enriquez-Flores, S.Rodriguez-Romero, A.Hernandez-Alcantara, G.Oria-Hernandez, J.Gutierrez-Castrellon, P.Perez-Hernandez, G.Mora-Ide, L.Castillo-Villanueva, A.Garcia-Torres, I.Mendez, S.T.Gomez-Manzo, S.Torres-Arroyo, A.Lopez-Velazquez, G.Reyes-Vivas, H.

(2011) Proteins 79: 2711-2724

  • DOI: 10.1002/prot.23100

  • PubMed Abstract: 
  • Giardiasis, the most prevalent intestinal parasitosis in humans, is caused by Giardia lamblia. Current drug therapies have adverse effects on the host, and resistant strains against these drugs have been reported, demonstrating an urgent need to desi ...

    Giardiasis, the most prevalent intestinal parasitosis in humans, is caused by Giardia lamblia. Current drug therapies have adverse effects on the host, and resistant strains against these drugs have been reported, demonstrating an urgent need to design more specific antigiardiasic drugs. ATP production in G. lamblia depends mainly on glycolysis; therefore, all enzymes of this pathway have been proposed as potential drug targets. We previously demonstrated that the glycolytic enzyme triosephosphate isomerase from G. lamblia (GlTIM), could be completely inactivated by low micromolar concentrations of thiol-reactive compounds, whereas, in the same conditions, the activity of human TIM (HuTIM) was almost unaltered. We found that the chemical modification (derivatization) of at least one Cys, of the five Cys residues per monomer in GlTIM, causes this inactivation. In this study, structural and functional studies were performed to describe the molecular mechanism of GlTIM inactivation by thiol-reactive compounds. We found that the Cys222 derivatization is responsible for GlTIM inactivation; this information is relevant because HuTIM has a Cys residue in an equivalent position (Cys217). GlTIM inactivation is associated with a decrease in ligand affinity, which affects the entropic component of ligand binding. In summary, this work describes a mechanism of inactivation that has not been previously reported for TIMs from other parasites and furthermore, we show that the difference in reactivity between the Cys222 in GlTIM and the Cys217 in HuTIM, indicates that the surrounding environment of each Cys residue has unique structural differences that can be exploited to design specific antigiardiasic drugs.


    Related Citations: 
    • Disulfide bridges in the mesophilic triosephosphate isomerase from Giardia lamblia are related to oligomerization and activity.
      Reyes-Vivas, H.,Diaz, A.,Peon, J.,Mendoza-Hernandez, G.,Hernandez-Alcantara, G.,De la Mora-De la Mora, I.,Enriquez-Flores, S.,Dominguez-Ramirez, L.,Lopez-Velazquez, G.
      (2007) J.Mol.Biol. 365: 752


    Organizational Affiliation

    Laboratorio de Bioquímica-Genética, Torre de Investigación, Instituto Nacional de Pediatría, Secretaría de Salud, 04530, México, D.F.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Triosephosphate isomerase
A
257Giardia intestinalisMutation(s): 1 
EC: 5.3.1.1
Find proteins for P36186 (Giardia intestinalis)
Go to UniProtKB:  P36186
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
GOL
Query on GOL

Download SDF File 
Download CCD File 
A
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
CA
Query on CA

Download SDF File 
Download CCD File 
A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
SCH
Query on SCH
A
L-PEPTIDE LINKINGC4 H9 N O2 S2CYS
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.098 Å
  • R-Value Free: 0.207 
  • R-Value Work: 0.180 
  • Space Group: I 2 2 2
Unit Cell:
Length (Å)Angle (°)
a = 56.373α = 90.00
b = 102.881β = 90.00
c = 118.908γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
SCALAdata scaling
CrystalCleardata collection
XDSdata reduction
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-06-22
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2011-08-24
    Type: Database references