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PfPK6, a novel cyclin-dependent kinase/mitogen-activated protein kinase-related protein kinase from Plasmodium

V Bracchi-Ricard1, S Barik, C Delvecchio

  • 1Department of Molecular Biology and Microbiology, University of Central Florida, Orlando, FL 32816, USA.

The Biochemical Journal
|March 23, 2000
PubMed

Insights

We discovered a new protein kinase, PfPK6, in Plasmodium falciparum, crucial for parasite development. This kinase, similar to CDK and MAPK families, shows activity and is targeted by inhibitors, offering potential therapeutic avenues.

Area of Science:

  • Molecular Parasitology
  • Protein Kinase Research
  • Malaria Drug Discovery

Background:

  • Plasmodium falciparum asexual erythrocytic stages rely on precise cell cycle regulation.
  • Protein kinases play critical roles in cell signaling and developmental transitions.
  • Identifying novel kinases in malaria parasites can reveal new therapeutic targets.

Purpose of the Study:

  • To isolate and characterize a novel protein kinase from Plasmodium falciparum.
  • To investigate the structural and functional properties of the identified kinase, PfPK6.
  • To explore the potential of PfPK6 as a drug target against malaria.

Main Methods:

  • Differential display RT-PCR (DDRT-PCR) for novel gene discovery.
  • Sequence analysis to determine homology to known kinase families (CDK, MAPK).
  • Western blot, immunofluorescence, and in vitro kinase assays for protein expression, localization, and activity.

Main Results:

  • A novel protein kinase cDNA, PfPK6, was isolated and characterized.
  • PfPK6 exhibits sequence similarity to both cyclin-dependent kinase (CDK) and mitogen-activated protein kinase (MAPK) families.
  • PfPK6 transcripts are upregulated during parasite development, and the protein is active, self-phosphorylating and phosphorylating substrates like histone and R2.
  • Kinase activity is sensitive to CDK inhibitors and prefers Mn2+ over Mg2+.

Conclusions:

  • PfPK6 is a novel protein kinase in Plasmodium falciparum with unique features, distinct from canonical CDKs and MAPKs.
  • Its expression and activity correlate with parasite developmental stages, suggesting a role in asexual erythrocytic development.
  • PfPK6 represents a potential new target for antimalarial drug development due to its sensitivity to CDK inhibitors.

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