3SRI

Crystal structure of Plasmodium falciparum AMA1 in complex with a 29aa PfRON2 peptide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free: 0.195 
  • R-Value Work: 0.176 
  • R-Value Observed: 0.177 

wwPDB Validation   3D Report Full Report


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Literature

Structural and functional insights into the malaria parasite moving junction complex.

Vulliez-Le Normand, B.Tonkin, M.L.Lamarque, M.H.Langer, S.Hoos, S.Roques, M.Saul, F.A.Faber, B.W.Bentley, G.A.Boulanger, M.J.Lebrun, M.

(2012) PLoS Pathog 8: e1002755-e1002755

  • DOI: 10.1371/journal.ppat.1002755
  • Primary Citation of Related Structures:  
    3ZWZ, 3SRJ, 3SRI

  • PubMed Abstract: 
  • Members of the phylum Apicomplexa, which include the malaria parasite Plasmodium, share many features in their invasion mechanism in spite of their diverse host cell specificities and life cycle characteristics. The formation of a moving junction (MJ) between the membranes of the invading apicomplexan parasite and the host cell is common to these intracellular pathogens ...

    Members of the phylum Apicomplexa, which include the malaria parasite Plasmodium, share many features in their invasion mechanism in spite of their diverse host cell specificities and life cycle characteristics. The formation of a moving junction (MJ) between the membranes of the invading apicomplexan parasite and the host cell is common to these intracellular pathogens. The MJ contains two key parasite components: the surface protein Apical Membrane Antigen 1 (AMA1) and its receptor, the Rhoptry Neck Protein (RON) complex, which is targeted to the host cell membrane during invasion. In particular, RON2, a transmembrane component of the RON complex, interacts directly with AMA1. Here, we report the crystal structure of AMA1 from Plasmodium falciparum in complex with a peptide derived from the extracellular region of PfRON2, highlighting clear specificities of the P. falciparum RON2-AMA1 interaction. The receptor-binding site of PfAMA1 comprises the hydrophobic groove and a region that becomes exposed by displacement of the flexible Domain II loop. Mutations of key contact residues of PfRON2 and PfAMA1 abrogate binding between the recombinant proteins. Although PfRON2 contacts some polymorphic residues, binding studies with PfAMA1 from different strains show that these have little effect on affinity. Moreover, we demonstrate that the PfRON2 peptide inhibits erythrocyte invasion by P. falciparum merozoites and that this strong inhibitory potency is not affected by AMA1 polymorphisms. In parallel, we have determined the crystal structure of PfAMA1 in complex with the invasion-inhibitory peptide R1 derived by phage display, revealing an unexpected structural mimicry of the PfRON2 peptide. These results identify the key residues governing the interactions between AMA1 and RON2 in P. falciparum and suggest novel approaches to antimalarial therapeutics.


    Organizational Affiliation

    Unité d'Immunologie Structurale, Institut Pasteur, Paris, France.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Apical membrane antigen 1A381Plasmodium falciparum CAMP/MalaysiaMutation(s): 5 
Gene Names: AMA-1PF83
Find proteins for P50489 (Plasmodium falciparum (isolate Camp / Malaysia))
Explore P50489 
Go to UniProtKB:  P50489
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Rhoptry neck protein 2B29Plasmodium falciparum 3D7Mutation(s): 0 
Gene Names: PF3D7_1452000
Find proteins for Q8IKV6 (Plasmodium falciparum (isolate 3D7))
Explore Q8IKV6 
Go to UniProtKB:  Q8IKV6
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free: 0.195 
  • R-Value Work: 0.176 
  • R-Value Observed: 0.177 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 70.724α = 90
b = 38.137β = 97.72
c = 72.078γ = 90
Software Package:
Software NamePurpose
MxCuBEdata collection
AMoREphasing
BUSTERrefinement
XDSdata reduction
SCALAdata scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-07-11
    Type: Initial release