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Protocol for Plasmodium falciparum Infections in Mosquitoes and Infection Phenotype Determination
14:10

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Published on: July 4, 2007

Characterization of a mitogen-activated protein (MAP) kinase from Plasmodium falciparum

R Graeser1, P Küry, R M Franklin

  • 1Department of Structural Biology, University of Basel, Switzerland.

Molecular Microbiology
|January 1, 1997
PubMed

Insights

The Plasmodium falciparum MAP kinase, PfMAP, is a functional kinase that phosphorylates substrates and is expressed in red blood cells. Active forms of PfMAP kinase increase during parasite maturation.

Area of Science:

  • Molecular Biology
  • Parasitology
  • Biochemistry

Background:

  • A novel mitogen-activated protein (MAP) kinase gene, PfMAP, has been identified in Plasmodium falciparum.
  • Understanding the function and expression of PfMAP is crucial for comprehending malaria parasite biology.

Purpose of the Study:

  • To confirm the functional activity of the Plasmodium falciparum MAP kinase (PfMAP).
  • To investigate the expression patterns and active forms of PfMAP during parasite development.

Main Methods:

  • Recombinant PfMAP kinase was expressed in Escherichia coli and tested for enzymatic activity.
  • Western blotting and immunoprecipitation were used to analyze PfMAP expression in Plasmodium falciparum-infected red blood cells.
  • PfMAP kinase activity was assessed using myelin basic protein as a substrate and by examining tyrosine phosphorylation.

Main Results:

  • Recombinant PfMAP kinase demonstrated autophosphorylation and substrate phosphorylation, confirming its MAP kinase function.
  • PfMAP is expressed in infected red blood cells as 40 kDa, 80 kDa, and 150 kDa forms.
  • The 40 kDa and 80 kDa forms are tyrosine phosphorylated, indicating active kinase, and their activity increases with parasite maturation.

Conclusions:

  • PfMAP is a functional MAP kinase essential for Plasmodium falciparum.
  • The expression and activation of PfMAP are regulated during the intraerythrocytic stage of the parasite lifecycle.

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