4Z80

Crystal structure of Toxoplasma gondii AMA4 DI-DII-EGF1 in complex with a 33 aa TgRON2L1 peptide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.53 Å
  • R-Value Free: 0.172 
  • R-Value Work: 0.153 
  • R-Value Observed: 0.154 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Dissecting the interface between apicomplexan parasite and host cell: Insights from a divergent AMA-RON2 pair.

Parker, M.L.Penarete-Vargas, D.M.Hamilton, P.T.Guerin, A.Dubey, J.P.Perlman, S.J.Spano, F.Lebrun, M.Boulanger, M.J.

(2016) Proc Natl Acad Sci U S A 113: 398-403

  • DOI: 10.1073/pnas.1515898113
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Plasmodium falciparum and Toxoplasma gondii are widely studied parasites in phylum Apicomplexa and the etiological agents of severe human malaria and toxoplasmosis, respectively. These intracellular pathogens have evolved a sophisticated invasion str ...

    Plasmodium falciparum and Toxoplasma gondii are widely studied parasites in phylum Apicomplexa and the etiological agents of severe human malaria and toxoplasmosis, respectively. These intracellular pathogens have evolved a sophisticated invasion strategy that relies on delivery of proteins into the host cell, where parasite-derived rhoptry neck protein 2 (RON2) family members localize to the host outer membrane and serve as ligands for apical membrane antigen (AMA) family surface proteins displayed on the parasite. Recently, we showed that T. gondii harbors a novel AMA designated as TgAMA4 that shows extreme sequence divergence from all characterized AMA family members. Here we show that sporozoite-expressed TgAMA4 clusters in a distinct phylogenetic clade with Plasmodium merozoite apical erythrocyte-binding ligand (MAEBL) proteins and forms a high-affinity, functional complex with its coevolved partner, TgRON2L1. High-resolution crystal structures of TgAMA4 in the apo and TgRON2L1-bound forms complemented with alanine scanning mutagenesis data reveal an unexpected architecture and assembly mechanism relative to previously characterized AMA-RON2 complexes. Principally, TgAMA4 lacks both a deep surface groove and a key surface loop that have been established to govern RON2 ligand binding selectivity in other AMAs. Our study reveals a previously underappreciated level of molecular diversity at the parasite-host-cell interface and offers intriguing insight into the adaptation strategies underlying sporozoite invasion. Moreover, our data offer the potential for improved design of neutralizing therapeutics targeting a broad range of AMA-RON2 pairs and apicomplexan invasive stages.


    Organizational Affiliation

    Department of Biochemistry and Microbiology, University of Victoria, Victoria, BC, V8P 5C2, Canada; mboulang@uvic.ca mylebrun@univ-montp2.fr.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
EGF family domain-containing protein
A, B
508Toxoplasma gondiiMutation(s): 0 
Gene Names: TGVEG_294330
Find proteins for S7UIL3 (Toxoplasma gondii (strain ATCC 50853 / GT1))
Go to UniProtKB:  S7UIL3
Protein Feature View
  • Reference Sequence

Find similar proteins by: Sequence  |  Structure

Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Cytoadherence-linked asexual protein
C, D
37Toxoplasma gondiiMutation(s): 0 
Gene Names: TGVEG_294400
Find proteins for B6KQU6 (Toxoplasma gondii (strain ATCC 50861 / VEG))
Go to UniProtKB:  B6KQU6
Protein Feature View
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NAG
Query on NAG

Download CCD File 
B
N-ACETYL-D-GLUCOSAMINE
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
SO4
Query on SO4

Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
GOL
Query on GOL

Download CCD File 
A, B
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.53 Å
  • R-Value Free: 0.172 
  • R-Value Work: 0.153 
  • R-Value Observed: 0.154 
  • Space Group: P 65
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 120.56α = 90
b = 120.56β = 90
c = 141.69γ = 120
Software Package:
Software NamePurpose
iMOSFLMdata reduction
Aimlessdata scaling
SHELXphasing
PHASERphasing
Cootmodel building
PHENIXrefinement
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Canadian Institutes of Health Research (CIHR)CanadaMOP82915

Revision History 

  • Version 1.0: 2015-12-30
    Type: Initial release
  • Version 1.1: 2016-01-13
    Changes: Database references
  • Version 1.2: 2016-01-27
    Changes: Database references
  • Version 1.3: 2017-09-20
    Changes: Author supporting evidence, Database references, Derived calculations
  • Version 1.4: 2020-01-08
    Changes: Author supporting evidence