FIKK Kinase, a Ser/Thr Kinase Important to Malaria Parasites, Is Inhibited by Tyrosine Kinase Inhibitors

Area of Science:

• Biochemistry and Parasitology
• Drug Discovery and Development

Background:

• FIKK kinase is a unique enzyme family found in Apicomplexan parasites, essential for malaria parasite survival.
• Targeting FIKK kinase presents a novel strategy for antimalarial drug development.

Purpose of the Study:

• To identify high-affinity inhibitors of FIKK kinase from Plasmodium vivax.
• To explore the FIKK kinase pharmacophore and identify potential lead compounds for antimalarials.

Main Methods:

• In vitro assay of recombinant Plasmodium vivax FIKK kinase.
• Screening of a small molecule library against the kinase domain.
• Investigation of tyrphostins and anthraquinones, including emodin.

Main Results:

• Several tyrosine kinase inhibitors were found to block FIKK kinase activity.
• Emodin was identified as a relatively high-affinity inhibitor of FIKK kinase.
• Anthraquinones were identified as a promising class of compounds for targeting FIKK kinase.

Conclusions:

• FIKK kinase is a viable drug target for antimalarial therapies.
• Emodin and related anthraquinones represent potential lead compounds for developing new antimalarials against Plasmodium vivax.