Influence of human p16INK4 and p21CIP1 on the in vitro activity of recombinant Plasmodium falciparum cyclin-dependent protein kinases

Zhiyu Li, Karine Le Roch, Jeanne A. Geyer, Cassandra L. Woodard, Sean T. Prigge, James Koh, Christian Doerig, Norman C. Waters

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28 Citations (Scopus)


The regulatory mechanisms of most cyclin dependent protein kinases (CDKs) are well understood and are highly conserved in eukaryotes. CDKs from the malaria parasite, Plasmodium falciparum, appear to be regulated in a similar manner with regard to cyclin binding and phosphorylation. In order to further understand their regulatory mechanisms, we examined two classes of cyclin dependent kinase inhibitors (CDIs) to inhibit a panel of plasmodial CDKs. We find that Pfmrk and PfPK5 are inhibited by heterologous p21CIP1 with varying degrees of inhibition. In contrast, PfPK6, a kinase with sequence features characteristic of both a CDK and MAP kinase, is unaffected by this CDI. Furthermore, the CDK4/6 specific CDI, p16INK4, fails to inhibit these plasmodial CDKs. Taken together, these results suggest that plasmodial CDKs may be regulated by the binding of inhibitory proteins in vivo.

Original languageEnglish
Pages (from-to)1207-1211
Number of pages5
JournalBiochemical and Biophysical Research Communications
Issue number5
Publication statusPublished - 16 Nov 2001
Externally publishedYes


  • Cell cycle
  • Cyclin dependent protein kinase
  • Inhibition
  • p16
  • p21
  • Pfmrk
  • PfPK5
  • PfPK6
  • Plasmodium falciparum

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