5BMW

Crystal structure of T75V mutant of Triosephosphate isomerase from Plasmodium falciparum


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.86 Å
  • R-Value Free: 0.182 
  • R-Value Work: 0.131 
  • R-Value Observed: 0.134 

Starting Model: experimental
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This is version 1.4 of the entry. See complete history


Literature

Probing the role of highly conserved residues in triosephosphate isomerase - analysis of site specific mutants at positions 64 and 75 in the Plasmodial enzyme

Bandyopadhyay, D.Murthy, M.R.Balaram, H.Balaram, P.

(2015) FEBS J 282: 3863-3882

  • DOI: https://doi.org/10.1111/febs.13384
  • Primary Citation of Related Structures:  
    4ZZ9, 5BMW, 5BMX, 5BNK, 5BRB

  • PubMed Abstract: 

    Highly conserved residues in enzymes are often found to be clustered close to active sites, suggesting that functional constraints dictate the nature of amino acid residues accommodated at these sites. Using the Plasmodium falciparum triosephosphate isomerase (PfTIM) enzyme (EC 5.3.1.1) as a template, we have examined the effects of mutations at positions 64 and 75, which are not directly involved in the proton transfer cycle. Thr (T) occurring at position 75 is completely conserved, whereas only Gln (Q) and Glu (E) are accommodated at position 64. Biophysical and kinetic data are reported for four T75 (T75S/V/C/N) and two Q64 (Q64N/E) mutants. The dimeric structure is weakened in the Q64E and Q64N mutants, whereas dimer integrity is unimpaired in all four T75 mutants. Measurement of the concentration dependence of enzyme activity permits an estimate of Kd values for dimer dissociation (Q64N = 73.7 ± 9.2 nm and Q64E = 44.6 ± 8.4 nm). The T75S/V/C mutants have activities comparable to the wild-type enzyme, whereas a fourfold drop is observed for T75N. All four T75 mutants show a dramatic fall in activity between 35 °C and 45 °C. Crystal structure determination of the T75S/V/N mutants provides insights into the variations in local interactions, with the T75N mutant showing the largest changes. Hydrogen-bond interactions determine dimer stability restricting the choice of residues at position 64 to Gln (Q) and Glu (E). At position 75, the overwhelming preference for Thr (T) may be dictated by the imperative of maintaining temperature stability of enzyme activity. Structural data have been deposited in the Protein Data Bank under accession numbers 4ZZ9, 5BMW, 5BMX, 5BNK and 5BRB.


  • Organizational Affiliation

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


Macromolecules
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
EC: 5.3.1.1
UniProt
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
Expand
  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
MES
Query on MES

Download Ideal Coordinates CCD File 
J [auth A]2-(N-MORPHOLINO)-ETHANESULFONIC ACID
C6 H13 N O4 S
SXGZJKUKBWWHRA-UHFFFAOYSA-N
EDO
Query on EDO

Download Ideal Coordinates CCD File 
C [auth A]
D [auth A]
E [auth A]
F [auth A]
G [auth A]
C [auth A],
D [auth A],
E [auth A],
F [auth A],
G [auth A],
H [auth A],
L [auth B],
M [auth B]
1,2-ETHANEDIOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
CA
Query on CA

Download Ideal Coordinates CCD File 
K [auth A]CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
NA
Query on NA

Download Ideal Coordinates CCD File 
I [auth A],
N [auth B]
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.86 Å
  • R-Value Free: 0.182 
  • R-Value Work: 0.131 
  • R-Value Observed: 0.134 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 39.21α = 90
b = 76.02β = 97.47
c = 74.36γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
SCALAdata scaling
PDB_EXTRACTdata extraction
iMOSFLMdata reduction
PHASERphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Department of BiotechnologyIndia--

Revision History  (Full details and data files)

  • Version 1.0: 2015-07-29
    Type: Initial release
  • Version 1.1: 2015-08-05
    Changes: Database references
  • Version 1.2: 2015-08-12
    Changes: Other
  • Version 1.3: 2015-10-28
    Changes: Database references
  • Version 1.4: 2023-11-08
    Changes: Data collection, Database references, Derived calculations, Refinement description