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A Simple Protocol for Platelet-mediated Clumping of Plasmodium falciparum-infected Erythrocytes in a Resource Poor Setting
Published on: May 16, 2013
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A Plasmodium falciparum PHIST protein binds the virulence factor PfEMP1 and comigrates to knobs on the host cell
Alexander Oberli1, Leanne M Slater2, Erin Cutts2
1Swiss Tropical and Public Health Institute, Basel, Switzerland; University of Basel, Basel, Switzerland; and.
Summary
A Plasmodium falciparum protein, PFE1605w, directly binds PfEMP1, a key malaria adhesion molecule. This interaction occurs in knobs, structures linked to severe malaria, suggesting a role in disease severity.
Area of Science:
- Malariology
- Molecular Parasitology
- Structural Biology
Background:
- Plasmodium falciparum-infected erythrocytes (iRBCs) form knobs, crucial for cytoadherence and severe malaria.
- P. falciparum erythrocyte membrane protein 1 (PfEMP1) is a major adhesion receptor clustering in knobs.
- Plasmodium helical interspersed subtelomeric (PHIST) domain proteins are exported and implicated in severe malaria.
Purpose of the Study:
- To investigate the interaction between PHIST proteins and PfEMP1.
- To elucidate the role of PHIST member PFE1605w in knob formation and PfEMP1 localization.
- To determine the structural basis of the PHIST-PfEMP1 interaction.
Main Methods:
- Co-immunoprecipitation and binding assays to assess PFE1605w-PfEMP1 interaction.
- Protein export and localization studies using microscopy.
- X-ray crystallography and nuclear magnetic resonance (NMR) to determine protein structures and interaction models.
Main Results:
- PFE1605w directly binds the intracellular segment of PfEMP1 with a dissociation constant (Kd) of 5 ± 0.6 μM.
- PFE1605w comigrates with PfEMP1 during export and localizes to knobs.
- Structural analysis revealed the first crystallographic structure of a PHIST protein and a partial model of the PHIST-PfEMP1 interaction.
Conclusions:
- PFE1605w reinforces the PfEMP1-cytoskeletal connection within knobs.
- PHIST proteins may function as interaction hubs within the parasite exportome.
- Understanding these interactions is critical for targeting severe malaria pathogenesis.
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