Plasmodium PK9 Inhibitors Promote Growth of Liver-Stage Parasites.

Journal Article (Journal Article)

There is a scarcity of pharmacological tools to interrogate protein kinase function in Plasmodium parasites, the causative agent of malaria. Among Plasmodium's protein kinases, those characterized as atypical represent attractive drug targets as they lack sequence similarity to human proteins. Here, we describe takinib as a small molecule to bind the atypical P. falciparum protein kinase 9 (PfPK9). PfPK9 phosphorylates the Plasmodium E2 ubiquitin-conjugating enzyme PfUBC13, which mediates K63-linkage-specific polyubiquitination. Takinib is a potent human TAK1 inhibitor, thus we developed the Plasmodium-selective takinib analog HS220. We demonstrate that takinib and HS220 decrease K63-linked ubiquitination in P. falciparum, suggesting PfPK9 inhibition in cells. Takinib and HS220 induce a unique phenotype where parasite size in hepatocytes increases, yet high compound concentrations decrease the number of parasites. Our studies highlight the role of PK9 in regulating parasite development and the potential of targeting Plasmodium kinases for malaria control.

Full Text

Duke Authors

Cited Authors

  • Raphemot, R; Eubanks, AL; Toro-Moreno, M; Geiger, RA; Hughes, PF; Lu, K-Y; Haystead, TAJ; Derbyshire, ER

Published Date

  • March 21, 2019

Published In

Volume / Issue

  • 26 / 3

Start / End Page

  • 411 - 419.e7

PubMed ID

  • 30595530

Pubmed Central ID

  • PMC6430656

Electronic International Standard Serial Number (EISSN)

  • 2451-9448

Digital Object Identifier (DOI)

  • 10.1016/j.chembiol.2018.11.003


  • eng

Conference Location

  • United States