1WOA

Structure of the loop6 hinge mutant of Plasmodium falciparum Triosephosphate Isomerase, W168F, complexed with Glycerol-2-phosphate


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.219 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structures of Unliganded and Inhibitor Complexes of W168F, a Loop6 Hinge Mutant of Plasmodium falciparum Triosephosphate Isomerase: Observation of an Intermediate Position of Loop6

Eaazhisai, K.Balaram, H.Balaram, P.Murthy, M.R.N.

(2004) J.Mol.Biol. 343: 671-684

  • DOI: 10.1016/j.jmb.2004.08.060
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The enzymatic reaction of triosephosphate isomerase (TIM) is controlled by the movement of a loop (loop6, residues 166-176). Crystal structures of TIMs from a variety of sources have revealed that the loop6, which is in an open conformation in the un ...

    The enzymatic reaction of triosephosphate isomerase (TIM) is controlled by the movement of a loop (loop6, residues 166-176). Crystal structures of TIMs from a variety of sources have revealed that the loop6, which is in an open conformation in the unliganded enzyme, adopts a closed conformation in inhibitor complexes. In contrast, structures with loop open conformation are obtained in most of the complexes of TIM from the malarial parasite Plasmodium falciparum (PfTIM). W168 is a conserved N-terminal hinge residue, involved in different sets of interactions in the "open" and "closed" forms of loop6. The role of W168 in determining the loop conformation was examined by structural studies on the mutant W168F and its complexes with ligands. The three-dimensional structures of unliganded mutant (1.8 A) and complexes with sulfate (2.8 A) and glycerol-2-phosphate (G2P) (2.8 A) have been determined. Loop6 was found disordered in these structures, reflecting the importance of W168 in stabilizing either the open or the closed states. Critical sequence differences between the Plasmodium enzyme and other TIMs may influence the equilibrium between the closed and open forms. Examination of the environment of the loop6 shows that its propensity for the open or the closed forms is influenced not only by Phe96 as suggested earlier, but also by Asn233, which occurs in the vicinity of the active site. This residue is Gly in the other TIM sequences and probably plays a crucial role in the mode of ligand binding, which in turn affects the loop opening/closing process in PfTIM.


    Organizational Affiliation

    Molecular Biophysics Unit, Indian Institute of Science, Bangalore, India.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Triosephosphate isomerase
A, B, C, D
248Plasmodium falciparumMutation(s): 2 
Gene Names: TPI
EC: 5.3.1.1
Find proteins for Q07412 (Plasmodium falciparum)
Go to UniProtKB:  Q07412
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
G2H
Query on G2H

Download SDF File 
Download CCD File 
A, B, C, D
2-HYDROXY-1-(HYDROXYMETHYL)ETHYL DIHYDROGEN PHOSPHATE
GLYCEROL-2-PHOSPHATE
C3 H9 O6 P
DHCLVCXQIBBOPH-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.219 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 51.050α = 90.00
b = 108.510β = 90.00
c = 178.750γ = 90.00
Software Package:
Software NamePurpose
AMoREphasing
SCALEPACKdata scaling
DENZOdata reduction
CNSrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-10-26
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance