2RJI

Malarial EBA-175 region VI crystallographic structure reveals a KIX-like binding interface


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.208 

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Literature

Malarial EBA-175 Region VI Crystallographic Structure Reveals a KIX-Like Binding Interface

Withers-Martinez, C.Haire, L.F.Hackett, F.Walker, P.A.Howell, S.A.Smerdon, S.J.Dodson, G.G.Blackman, M.J.

(2008) J.Mol.Biol. 375: 773-781

  • DOI: 10.1016/j.jmb.2007.10.071

  • PubMed Abstract: 
  • The malaria parasite proliferates in the bloodstream of its vertebrate host by invading and replicating within erythrocytes. To achieve successful invasion, a number of discrete and essential events need to take place at the parasite-host cell interf ...

    The malaria parasite proliferates in the bloodstream of its vertebrate host by invading and replicating within erythrocytes. To achieve successful invasion, a number of discrete and essential events need to take place at the parasite-host cell interface. Erythrocyte-binding antigen 175 (EBA-175) is a member of a family of Plasmodium falciparum erythrocyte-binding proteins involved in the formation of a tight junction, a necessary step in invasion. Here we present the crystal structure of EBA-175 region VI (rVI), a cysteine-rich domain that is highly conserved within the protein family and is essential for EBA-175 trafficking. The structure was solved by selenomethionine single-wavelength anomalous dispersion at 1.8 A resolution. It reveals a homodimer, containing in each subunit a compact five-alpha-helix core that is stabilized by four conserved disulfide bridges. rVI adopts a novel fold that is likely conserved across the protein family, indicating a conserved function. It shows no similarity to the Duffy-binding-like domains of EBA-175 involved in erythrocyte binding, indicating a distinct role. Remarkably, rVI possesses structural features related to the KIX-binding domain of the coactivator CREB-binding protein, supporting the binding and trafficking roles that have been ascribed to it and providing a rational basis for further experimental investigation of its function.


    Organizational Affiliation

    Division of Parasitology, National Institute for Medical Research, Mill Hill, London NW7 1AA, UK. cmartin@nimr.mrc.ac.uk




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Erythrocyte binding antigen 175
A, B
84Plasmodium falciparumMutation(s): 2 
Gene Names: erythrocyte-binding protein
Find proteins for Q25842 (Plasmodium falciparum)
Go to UniProtKB:  Q25842
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download SDF File 
Download CCD File 
A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.208 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 50.237α = 90.00
b = 65.591β = 90.00
c = 105.352γ = 90.00
Software Package:
Software NamePurpose
SHELXSphasing
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling
HKL-2000data collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-11-27
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance