F96Y Mutant of Plasmodium Falciparum Triosephosphate Isomerase

Experimental Data Snapshot

  • Resolution: 1.90 Å
  • R-Value Free: 0.224 
  • R-Value Work: 0.180 
  • R-Value Observed: 0.183 

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This is version 1.2 of the entry. See complete history


Connecting Active-Site Loop Conformations and Catalysis in Triosephosphate Isomerase: Insights from a Rare Variation at Residue 96 in the Plasmodial Enzyme

Pareek, V.Samanta, M.Joshi, N.V.Balaram, H.Murthy, M.R.N.Balaram, P.

(2016) Chembiochem 17: 620-629

  • DOI: https://doi.org/10.1002/cbic.201500532
  • Primary Citation of Related Structures:  
    4X22, 4YMZ, 4YWI, 4YXG, 4Z0J, 4Z0S

  • PubMed Abstract: 

    Despite extensive research into triosephosphate isomerases (TIMs), there exists a gap in understanding of the remarkable conjunction between catalytic loop-6 (residues 166-176) movement and the conformational flip of Glu165 (catalytic base) upon substrate binding that primes the active site for efficient catalysis. The overwhelming occurrence of serine at position 96 (98% of the 6277 unique TIM sequences), spatially proximal to E165 and the loop-6 residues, raises questions about its role in catalysis. Notably, Plasmodium falciparum TIM has an extremely rare residue--phenylalanine--at this position whereas, curiously, the mutant F96S was catalytically defective. We have obtained insights into the influence of residue 96 on the loop-6 conformational flip and E165 positioning by combining kinetic and structural studies on the PfTIM F96 mutants F96Y, F96A, F96S/S73A, and F96S/L167V with sequence conservation analysis and comparative analysis of the available apo and holo structures of the enzyme from diverse organisms.

  • Organizational Affiliation

    Molecular Biophysics Unit, Indian Institute of Science, Bangalore, 560012, India.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Triosephosphate isomerase
A, B
248Plasmodium falciparumMutation(s): 2 
Gene Names: TPI
Find proteins for Q07412 (Plasmodium falciparum)
Explore Q07412 
Go to UniProtKB:  Q07412
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ07412
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.90 Å
  • R-Value Free: 0.224 
  • R-Value Work: 0.180 
  • R-Value Observed: 0.183 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 37α = 90
b = 70.32β = 101.9
c = 72.58γ = 90
Software Package:
Software NamePurpose
iMOSFLMdata reduction
SCALAdata scaling

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number

Revision History  (Full details and data files)

  • Version 1.0: 2016-02-03
    Type: Initial release
  • Version 1.1: 2016-04-20
    Changes: Database references
  • Version 1.2: 2023-11-08
    Changes: Data collection, Database references, Derived calculations, Refinement description