3ZLE

Crystal structure of Toxoplasma gondii sporozoite AMA1

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.35 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.209 
  • R-Value Observed: 0.210 

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Literature

Toxoplasma Gondii Sporozoites Invade Host Cells Using Two Novel Paralogs of Ron2 and Ama1

Poukchanski, A., Tonkin, M.L., Fritz, H.M., Treeck, M., Boulanger, M.J., Boothroyd, J.C.

(2013) PLoS One 8: 70637

  • DOI: 10.1371/journal.pone.0070637
  • Primary Citation of Related Structures:  
    3ZLD, 3ZLE

  • PubMed Abstract: 

    • Toxoplasma gondii is an obligate intracellular parasite of the phylum Apicomplexa. The interaction of two well-studied proteins, Apical Membrane Antigen 1 (AMA1) and Rhoptry Neck protein 2 (RON2), has been shown to be critical for invasion by the asexual tachyzoite stage ...

    Toxoplasma gondii is an obligate intracellular parasite of the phylum Apicomplexa. The interaction of two well-studied proteins, Apical Membrane Antigen 1 (AMA1) and Rhoptry Neck protein 2 (RON2), has been shown to be critical for invasion by the asexual tachyzoite stage. Recently, two paralogues of these proteins, dubbed sporoAMA1 and sporoRON2 (or RON2L2), respectively, have been identified but not further characterized in proteomic and transcriptomic analyses of Toxoplasma sporozoites. Here, we show that sporoAMA1 and sporoRON2 localize to the apical region of sporozoites and that, in vitro, they interact specifically and exclusively, with no detectable interaction of sporoAMA1 with generic RON2 or sporoRON2 with generic AMA1. Structural studies of the interacting domains of sporoRON2 and sporoAMA1 indicate a novel pairing that is similar in overall form but distinct in detail from the previously described interaction of the generic pairing. Most notably, binding of sporoRON2 domain 3 to domains I/II of sporoAMA1 results in major alterations in the latter protein at the site of binding and allosterically in the membrane-proximal domain III of sporoAMA1 suggesting a possible role in signaling. Lastly, pretreatment of sporozoites with domain 3 of sporoRON2 substantially impedes their invasion into host cells while having no effect on tachyzoites, and vice versa for domain 3 of generic RON2 (which inhibits tachyzoite but not sporozoite invasion). These data indicate that sporozoites and tachyzoites each use a distinct pair of paralogous AMA1 and RON2 proteins for invasion into host cells, possibly due to the very different environment in which they each must function.

    Organizational Affiliation: 

    Department of Microbiology and Immunology, Stanford University School of Medicine, Stanford, California, United States of America.



Macromolecules
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(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
APICAL MEMBRANE ANTIGEN 1
A, B, C, D, E, F, G, H, I, J, K, L
A, B, C, D, E, F, G, H, I, J, K, L
396Toxoplasma gondiiMutation(s): 0 
UniProt
Find proteins for B6K9M7 (Toxoplasma gondii (strain ATCC 50861 / VEG))
Explore B6K9M7 
Go to UniProtKB:  B6K9M7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupB6K9M7
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NAG
Query on NAG
Download Ideal Coordinates CCD File 
BA [auth F],
DA [auth G],
FA [auth H],
JA [auth K],
KA [auth L],
BA [auth F],
DA [auth G],
FA [auth H],
JA [auth K],
KA [auth L],
M [auth A],
Q [auth B],
T [auth C],
Y [auth E]
2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N		 Ligand Interaction
GOL
Query on GOL
Download Ideal Coordinates CCD File 
AA [auth E],
CA [auth F],
EA [auth G],
GA [auth H],
HA [auth I],
AA [auth E],
CA [auth F],
EA [auth G],
GA [auth H],
HA [auth I],
IA [auth J],
LA [auth L],
MA [auth L],
N [auth A],
O [auth A],
P [auth A],
R [auth B],
S [auth B],
U [auth C],
V [auth C],
W [auth D],
X [auth D],
Z [auth E]
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.35 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.209 
  • R-Value Observed: 0.210 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 179.19α = 90
b = 155.52β = 92.31
c = 180.59γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
iMOSFLMdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-08-28
    Type: Initial release
  • Version 1.1: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Derived calculations, Other, Structure summary