African sleeping sickness is responsible for thousands of deaths annually and new therapeutics are needed. This study evaluated aromathecins, experimental inhibitors of mammalian topoisomerase IB, against Trypanosoma brucei African trypanosomes. The compounds had selectively toxic antiparasitic potency, had in situ poisoning activity against the phylogenetically unique topoisomerase in these parasites, and a representative compound intercalated into DNA with micromolar affinity. DNA intercalation and topoisomerase poisoning may contribute to the antitrypanosomal activity of aromathecins.
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