Abstract

Quinoline derivatives such as chloroquine and primaquine are widely used for the treatment of malaria. These drugs are also used for the treatment of trypanosomiasis, and more recently for cancer therapy. However, molecular target(s) of these drugs remain unclear. In this study, we have identified human pyridoxal kinase as a binding protein of primaquine. Primaquine inhibited pyridoxal kinases of malaria, trypanosome and human, while chloroquine inhibited only malaria pyridoxal kinase. Thus, we have identified pyridoxal kinase as a possible target molecule of the antimalarial drugs chloroquine and primaquine.

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