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A conditional export system provides new insights into protein export in Plasmodium falciparum-infected erythrocytes

Theodora Saridaki1, Cecilia P Sanchez, Judith Pfahler

  • 1Hygiene Institut, Abteilung Parasitologie, Universitätsklinikum Heidelberg, Im Neuenheimer Feld 324, 69120 Heidelberg, Germany.

Cellular Microbiology
|August 12, 2008
PubMed

Insights

Researchers developed a new system to track how malaria parasites export virulence proteins. This method revealed that exported proteins interact with the molecular chaperone PfBiP during early export steps, clarifying the Plasmodium falciparum export pathway.

Area of Science:

  • Molecular parasitology
  • Cell biology
  • Infectious diseases

Background:

  • The malaria parasite Plasmodium falciparum exports virulence factors into the host erythrocyte.
  • The precise trafficking routes for these exported proteins remain poorly understood due to technical limitations.

Purpose of the Study:

  • To establish a conditional protein export system in P. falciparum to study the temporal dynamics of protein trafficking.
  • To identify intermediate steps and interacting factors during protein export.

Main Methods:

  • Development of a conditional protein export system using a conditional aggregation domain (CAD domain).
  • Fusion of the CAD domain to STEVOR and PfSBP1 to control export of soluble and transmembrane proteins.
  • Utilizing the system to study temporal events and identify interacting proteins.

Main Results:

  • The conditional export system successfully controlled the export of proteins to the erythrocyte cytosol and Maurer's clefts.
  • The system enabled the study of temporal sequences and identification of intermediate export steps.
  • Evidence was found for a physical interaction between exported proteins and the molecular chaperone PfBiP during early export.

Conclusions:

  • The developed conditional export system is a valuable tool for studying Plasmodium falciparum protein export.
  • The study identified PfBiP as an interacting factor during the early stages of protein export.
  • This work provides new insights into the molecular mechanisms of malaria parasite virulence factor trafficking.

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