4JNO

Crystal structure of Plasmodium falciparum Erythrocyte Binding Antigen 140 (PfEBA-140/BAEBL) Region II in complex with sialyllactose


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.218 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Molecular Basis for Sialic Acid-dependent Receptor Recognition by the Plasmodium falciparum Invasion Protein Erythrocyte-binding Antigen-140/BAEBL.

Malpede, B.M.Lin, D.H.Tolia, N.H.

(2013) J.Biol.Chem. 288: 12406-12415

  • DOI: 10.1074/jbc.M113.450643

  • PubMed Abstract: 
  • Plasmodium falciparum erythrocyte invasion is dependent on high affinity recognition of sialic acid on cell surface receptors. The erythrocyte binding-like (EBL) family of invasion ligands mediates recognition of sialic acid on erythrocyte glycoprote ...

    Plasmodium falciparum erythrocyte invasion is dependent on high affinity recognition of sialic acid on cell surface receptors. The erythrocyte binding-like (EBL) family of invasion ligands mediates recognition of sialic acid on erythrocyte glycoproteins. Erythrocyte-binding antigen-140 (PfEBA-140/BAEBL) is a critical EBL ligand that binds sialic acid on its receptor glycophorin C. We present here the crystal structure of the two-domain receptor-binding region of PfEBA-140 in complex with a glycan containing sialic acid. The structure identifies two glycan-binding pockets unique to PfEBA-140 and not shared by other EBL ligands. Specific molecular interactions that enable receptor engagement are identified and reveal that the glycan binding mode is distinct from that of apicomplexan and viral cell surface recognition ligands as well as host immune factors that bind sialic acid. Erythrocyte binding experiments elucidated essential glycan contact residues and identified divergent functional roles for each receptor-binding site. One of four polymorphisms proposed to affect receptor binding was localized to a glycan-binding site, providing a structural basis for altered erythrocyte engagement. The studies described here provide the first full description of sialic acid-dependent molecular interactions at the P. falciparum erythrocyte invasion interface and define a framework for development of PfEBA-140-based therapeutics, vaccines, and diagnostics assessing vaccine efficacy and natural immunity to infection.


    Organizational Affiliation

    Department of Molecular Microbiology, Washington University School of Medicine, St Louis, Missouri 63110, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
BAEBL protein
A
615Plasmodium falciparumN/A
Find proteins for Q8WS31 (Plasmodium falciparum)
Go to UniProtKB:  Q8WS31
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SIA
Query on SIA

Download SDF File 
Download CCD File 
A
O-SIALIC ACID
C11 H19 N O9
SQVRNKJHWKZAKO-YRMXFSIDSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.218 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 64.950α = 90.00
b = 76.030β = 96.93
c = 81.430γ = 90.00
Software Package:
Software NamePurpose
PHENIXrefinement
PHASERphasing
XDSdata reduction
Blu-Icedata collection
XDSdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2013-03-15 
  • Released Date: 2013-03-27 
  • Deposition Author(s): Tolia, N.H.

Revision History 

  • Version 1.0: 2013-03-27
    Type: Initial release
  • Version 1.1: 2013-04-03
    Type: Database references
  • Version 1.2: 2013-05-22
    Type: Database references