4O32

Structure of a malarial protein


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.196 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.207 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history

Literature

Crystal structure and solution characterization of the thioredoxin-2 from Plasmodium falciparum, a constituent of an essential parasitic protein export complex.

Peng, M.Cascio, D.Egea, P.F.

(2015) Biochem.Biophys.Res.Commun. 456: 403-409

  • DOI: 10.1016/j.bbrc.2014.11.096

  • PubMed Abstract: 
  • Survival of the malaria parasite Plasmodium falciparum when it infects red blood cells depends upon its ability to export hundreds of its proteins beyond an encasing vacuole. Protein export is mediated by a parasite-derived protein complex, the Plasm ...

    Survival of the malaria parasite Plasmodium falciparum when it infects red blood cells depends upon its ability to export hundreds of its proteins beyond an encasing vacuole. Protein export is mediated by a parasite-derived protein complex, the Plasmodium translocon of exported proteins (PTEX), and requires unfolding of the different cargos prior to their translocation across the vacuolar membrane. Unfolding is performed by the AAA+protein unfoldase HSP101/ClpB2 and the thioredoxin-2 enzyme (TRX2). Protein trafficking is dramatically impaired in parasites with defective HSP101 or lacking TRX2. These two PTEX subunits drive export and are targets for the design of a novel class of antimalarials: protein export inhibitors. To rationalize inhibitor design, we solved the crystal structure of Pfal-TRX2 at 2.2-Å resolution. Within the asymmetric unit, the three different copies of this protein disulfide reductase sample its two redox catalytic states. Size exclusion chromatography and small-angle X-ray scattering (SAXS) analyses demonstrate that Pfal-TRX2 is monomeric in solution. A non-conserved N-terminal extension precedes the canonical thioredoxin-fold; although it is not observed in our structure, our solution analysis suggests it is flexible in contrast to Plasmodium thioredoxin-1. This represents a first step towards the reconstitution of the entire PTEX for mechanistic and structural studies.


    Organizational Affiliation

    Department of Biological Chemistry, David Geffen School of Medicine, UCLA, Los Angeles, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Thioredoxin
A, B, C
138Plasmodium falciparum (isolate 3D7)Mutation(s): 0 
Gene Names: trx2
Find proteins for Q8IDP4 (Plasmodium falciparum (isolate 3D7))
Go to UniProtKB:  Q8IDP4
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL

Download SDF File 
Download CCD File 
A
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.196 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.207 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 77.030α = 90.00
b = 77.030β = 90.00
c = 134.415γ = 90.00
Software Package:
Software NamePurpose
HKL2Mapphasing
APSdata collection
XDSdata scaling
PHENIXrefinement
HKL2Mapmodel building
XDSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-12-24
    Type: Initial release
  • Version 1.1: 2015-01-14
    Type: Other
  • Version 1.2: 2015-01-28
    Type: Database references
  • Version 1.3: 2017-11-22
    Type: Refinement description
  • Version 1.4: 2018-01-24
    Type: Refinement description