5EUC

The role of the C-terminal region on the oligomeric state and enzymatic activity of Trypanosoma cruzi hypoxanthine phosphoribosyl transferase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.65 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.190 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

The role of the C-terminal region on the oligomeric state and enzymatic activity of Trypanosoma cruzi hypoxanthine phosphoribosyl transferase.

Valsecchi, W.M.Cousido-Siah, A.Defelipe, L.A.Mitschler, A.Podjarny, A.Santos, J.Delfino, J.M.

(2016) Biochim.Biophys.Acta 1864: 655-666

  • DOI: 10.1016/j.bbapap.2016.03.005

  • PubMed Abstract: 
  • Hypoxanthine phosphoribosyl transferase from Trypanosoma cruzi (TcHPRT) is a critical enzyme for the survival of the parasite. This work demonstrates that the full-length form in solution adopts a stable and enzymatically active tetrameric form, exhi ...

    Hypoxanthine phosphoribosyl transferase from Trypanosoma cruzi (TcHPRT) is a critical enzyme for the survival of the parasite. This work demonstrates that the full-length form in solution adopts a stable and enzymatically active tetrameric form, exhibiting large inter-subunit surfaces. Although this protein irreversibly aggregates during unfolding, oligomerization is reversible and can be modulated by low concentrations of urea. When the C-terminal region, which is predicted as a disordered stretch, is excised by proteolysis, TcHPRT adopts a dimeric state, suggesting that the C-terminal region acts as a main guide for the quaternary arrangement. These results are in agreement with X-ray crystallographic data presented in this work. On the other hand, the C-terminal region exhibits a modulatory role on the enzyme, as attested by the enhanced activity observed for the dimeric form. Bisphosphonates act as substrate-mimetics, uncovering long-range communications among the active sites. All in all, this work contributes to establish new ways applicable to the design of novel inhibitors that could eventually result in new drugs against parasitic diseases.


    Organizational Affiliation

    Instituto de Química y Fisicoquímica Biológicas, Universidad de Buenos Aires, Junín 956, C1113AAD Buenos Aires, Argentina.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Hypoxanthine-guanine phosphoribosyltransferase
A, B, C, D
229Trypanosoma cruzi (strain CL Brener)Mutation(s): 0 
EC: 2.4.2.8
Find proteins for Q4DRC4 (Trypanosoma cruzi (strain CL Brener))
Go to UniProtKB:  Q4DRC4
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.65 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.190 
  • Space Group: P 31
Unit Cell:
Length (Å)Angle (°)
a = 95.667α = 90.00
b = 95.667β = 90.00
c = 75.685γ = 120.00
Software Package:
Software NamePurpose
PHASERphasing
REFMACrefinement
PDB_EXTRACTdata extraction
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2016-03-30
    Type: Initial release