Crystal structure of Schistosoma mansoni Peroxiredoxin I C48S mutant with one decamer in the ASU

Experimental Data Snapshot

  • Resolution: 2.49 Å
  • R-Value Free: 0.203 
  • R-Value Work: 0.188 
  • R-Value Observed: 0.190 

wwPDB Validation   3D Report Full Report

This is version 1.2 of the entry. See complete history


Switching between the Alternative Structures and Functions of a 2-Cys Peroxiredoxin, by Site-Directed Mutagenesis

Angelucci, F.Saccoccia, F.Ardini, M.Boumis, G.Brunori, M.Dileandro, L.Ippoliti, R.Miele, A.E.Natoli, G.Scotti, S.Bellelli, A.

(2013) J Mol Biol 425: 4556

  • DOI: https://doi.org/10.1016/j.jmb.2013.09.002
  • Primary Citation of Related Structures:  
    3ZL5, 3ZLP

  • PubMed Abstract: 

    Members of the typical 2-Cys peroxiredoxin (Prx) subfamily represent an intriguing example of protein moonlighting behavior since this enzyme shifts function: indeed, upon chemical stimuli, such as oxidative stress, Prx undergoes a switch from peroxidase to molecular chaperone, associated to a change in quaternary structure from dimers/decamers to higher-molecular-weight (HMW) species. In order to detail the structural mechanism of this switch at molecular level, we have designed and expressed mutants of peroxiredoxin I from Schistosoma mansoni (SmPrxI) with constitutive HMW assembly and molecular chaperone activity. By a combination of X-ray crystallography, transmission electron microscopy and functional experiments, we defined the structural events responsible for the moonlighting behavior of 2-Cys Prx and we demonstrated that acidification is coupled to local structural variations localized at the active site and a change in oligomerization to HMW forms, similar to those induced by oxidative stress. Moreover, we suggest that the binding site of the unfolded polypeptide is at least in part contributed by the hydrophobic surface exposed by the unfolding of the active site. We also find an inverse correlation between the extent of ring stacking and molecular chaperone activity that is explained assuming that the binding occurs at the extremities of the nanotube, and the longer the nanotube is, the lesser the ratio binding sites/molecular mass is.

  • Organizational Affiliation

    Department of Health, Life and Environmental Sciences, University of L'Aquila, Piazzale Salvatore Tommasi 1, 67100 L'Aquila, Italy. Electronic address: francesco.angelucci@univaq.it.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C, D, E
A, B, C, D, E, F, G, H, I, J
222Schistosoma mansoniMutation(s): 1 
Gene Names: TPx-1TPx1
Find proteins for O97161 (Schistosoma mansoni)
Explore O97161 
Go to UniProtKB:  O97161
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO97161
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on PEG

Download Ideal Coordinates CCD File 
P [auth F],
Q [auth F],
T [auth H],
X [auth I]
C4 H10 O3
Query on SO4

Download Ideal Coordinates CCD File 
K [auth A]
L [auth C]
M [auth D]
N [auth E]
O [auth F]
K [auth A],
L [auth C],
M [auth D],
N [auth E],
O [auth F],
R [auth G],
S [auth H],
U [auth I],
V [auth I],
W [auth I],
Y [auth J],
Z [auth J]
O4 S
Experimental Data & Validation

Experimental Data

  • Resolution: 2.49 Å
  • R-Value Free: 0.203 
  • R-Value Work: 0.188 
  • R-Value Observed: 0.190 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 114.44α = 90
b = 94.985β = 108.51
c = 114.417γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XDSdata scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-09-11
    Type: Initial release
  • Version 1.1: 2013-09-18
    Changes: Database references
  • Version 1.2: 2013-11-13
    Changes: Database references