4CBU

Crystal structure of Plasmodium falciparum actin I


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.30 Å
  • R-Value Free: 0.153 
  • R-Value Work: 0.120 
  • R-Value Observed: 0.121 

wwPDB Validation 3D Report Full Report



Literature

Structural Differences Explain Diverse Functions of Plasmodium Actins.

Vahokoski, J.Bhargav, S.P.Desfosses, A.Andreadaki, M.Kumpula, E.Martinez, S.M.Ignatev, A.Lepper, S.Frischknecht, F.Siden-Kiamos, I.Sachse, C.Kursula, I.

(2014) PLoS Pathog 10: 4091

  • DOI: 10.1371/journal.ppat.1004091
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Actins are highly conserved proteins and key players in central processes in all eukaryotic cells. The two actins of the malaria parasite are among the most divergent eukaryotic actins and also differ from each other more than isoforms in any other s ...

    Actins are highly conserved proteins and key players in central processes in all eukaryotic cells. The two actins of the malaria parasite are among the most divergent eukaryotic actins and also differ from each other more than isoforms in any other species. Microfilaments have not been directly observed in Plasmodium and are presumed to be short and highly dynamic. We show that actin I cannot complement actin II in male gametogenesis, suggesting critical structural differences. Cryo-EM reveals that Plasmodium actin I has a unique filament structure, whereas actin II filaments resemble canonical F-actin. Both Plasmodium actins hydrolyze ATP more efficiently than α-actin, and unlike any other actin, both parasite actins rapidly form short oligomers induced by ADP. Crystal structures of both isoforms pinpoint several structural changes in the monomers causing the unique polymerization properties. Inserting the canonical D-loop to Plasmodium actin I leads to the formation of long filaments in vitro. In vivo, this chimera restores gametogenesis in parasites lacking actin II, suggesting that stable filaments are required for exflagellation. Together, these data underline the divergence of eukaryotic actins and demonstrate how structural differences in the monomers translate into filaments with different properties, implying that even eukaryotic actins have faced different evolutionary pressures and followed different paths for developing their polymerization properties.


    Organizational Affiliation

    Faculty of Biochemistry and Molecular Medicine, University of Oulu, Oulu, Finland; Centre for Structural Systems Biology; Helmholtz Centre for Infection Research and German Electron Synchrotron, Hamburg, Germany.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
GELSOLING127Mus musculusMutation(s): 0 
Gene Names: GsnGsb
Find proteins for P13020 (Mus musculus)
Explore P13020 
Go to UniProtKB:  P13020
Protein Feature View
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  • Reference Sequence

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ACTIN-1A378Plasmodium falciparumMutation(s): 0 
Find proteins for P86287 (Plasmodium falciparum (isolate HB3))
Explore P86287 
Go to UniProtKB:  P86287
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ATP
Query on ATP

Download CCD File 
A
ADENOSINE-5'-TRIPHOSPHATE
C10 H16 N5 O13 P3
ZKHQWZAMYRWXGA-KQYNXXCUSA-N
 Ligand Interaction
CA
Query on CA

Download CCD File 
A, G
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.30 Å
  • R-Value Free: 0.153 
  • R-Value Work: 0.120 
  • R-Value Observed: 0.121 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 68.98α = 90
b = 110.3β = 90
c = 71.48γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XSCALEdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-04-30
    Type: Initial release