2Y8S

Co-structure of an AMA1 mutant (Y230A) with a surface exposed region of RON2 from Toxoplasma gondii

• PDB DOI:  https://doi.org/10.2210/pdb2Y8S/pdb

• Classification: MEMBRANE PROTEIN
• Organism(s): Toxoplasma gondii
• Expression System: Trichoplusia ni
• Mutation(s): Yes 


• Deposited: 2011-02-10 Released: 2011-08-03 
• Deposition Author(s): Tonkin, M.L., Roques, M., Lamarque, M.H., Pugniere, M., Douguet, D., Crawford, J., Lebrun, M., Boulanger, M.J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.55 Å
• R-Value Free: 0.263 
• R-Value Work: 0.185 
• R-Value Observed: 0.189 

Literature

Host Cell Invasion by Apicomplexan Parasites: Insights from the Co-Structure of Ama1 with a Ron2 Peptide

Tonkin, M.L., Roques, M., Lamarque, M.H., Pugniere, M., Douguet, D., Crawford, J., Lebrun, M., Boulanger, M.J.

(2011) Science 333: 463

• PubMed: 21778402 
• DOI: https://doi.org/10.1126/science.1204988
• Primary Citation of Related Structures:  
  2Y8R, 2Y8S, 2Y8T


• PubMed Abstract: 
  

Apicomplexan parasites such as Toxoplasma gondii and Plasmodium species actively invade host cells through a moving junction (MJ) complex assembled at the parasite-host cell interface. MJ assembly is initiated by injection of parasite rhoptry neck proteins (RONs) into the host cell, where RON2 spans the membrane and functions as a receptor for apical membrane antigen 1 (AMA1) on the parasite. We have determined the structure of TgAMA1 complexed with a RON2 peptide at 1.95 angstrom resolution. A stepwise assembly mechanism results in an extensive buried surface area, enabling the MJ complex to resist the mechanical forces encountered during host cell invasion. Besides providing insights into host cell invasion by apicomplexan parasites, the structure offers a basis for designing therapeutics targeting these global pathogens.

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Organizational Affiliation: 

Department of Biochemistry and Microbiology, University of Victoria, Victoria, British Columbia V8W 3P6, Canada.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Biological Assembly 2  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

Biological assembly 2 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 104.19 kDa 
• Atom Count: 6,862 
• Modelled Residue Count: 848 
• Deposited Residue Count: 938 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
APICAL MEMBRANE ANTIGEN, PUTATIVE	A, C [auth D]	432	Toxoplasma gondii	Mutation(s): 1
UniProt
Find proteins for B6KAM0 (Toxoplasma gondii (strain ATCC 50861 / VEG)) Explore B6KAM0  Go to UniProtKB:  B6KAM0

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
RHOPTRY NECK PROTEIN 2	B, D [auth E]	37	Toxoplasma gondii	Mutation(s): 0
UniProt
Find proteins for B6KV60 (Toxoplasma gondii (strain ATCC 50611 / Me49)) Explore B6KV60  Go to UniProtKB:  B6KV60

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
NAG	E [auth A], J [auth D]	2-acetamido-2-deoxy-beta-D-glucopyranose C8 H15 N O6 OVRNDRQMDRJTHS-FMDGEEDCSA-N
GOL	H [auth A], I [auth A], K [auth D]	GLYCEROL C3 H8 O3 PEDCQBHIVMGVHV-UHFFFAOYSA-N
BO3	F [auth A], G [auth A]	BORIC ACID B H3 O3 KGBXLFKZBHKPEV-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.55 Å
• R-Value Free: 0.263 
• R-Value Work: 0.185 
• R-Value Observed: 0.189 
• Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 70.52	α = 90
b = 96.83	β = 116.75
c = 78.33	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement

Structure Validation

Entry History 

Deposition Data

• Released Date: 2011-08-03 
Deposition Author(s): Tonkin, M.L., Roques, M., Lamarque, M.H., Pugniere, M., Douguet, D., Crawford, J., Lebrun, M., Boulanger, M.J.

Revision History  

• Version 1.0: 2011-08-03
  Type: Initial release
  
• Version 1.1: 2019-04-03
  Changes: Data collection, Derived calculations, Other, Source and taxonomy
• Version 1.2: 2020-07-29
  Type: Remediation
  Reason: Carbohydrate remediation
  Changes: Data collection, Derived calculations, Other, Structure summary