期刊
ANTIMICROBIAL AGENTS AND CHEMOTHERAPY
卷 56, 期 8, 页码 4207-4213出版社
AMER SOC MICROBIOLOGY
DOI: 10.1128/AAC.00328-12
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资金
- Ontario Agency for Health Protection and Promotion
Previous studies have shown an antimalarial effect of total alkaloids extracted from leaves of Guiera senegalensis from Mali in West Africa. We independently observed that the beta-carboline alkaloid harmine obtained from a natural product library screen inhibited Plasmodium falciparum heat shock protein 90 (PfHsp90) ATP-binding domain. In this study, we confirmed harmine-PfHsp90-specific affinity using surface plasmon resonance analysis (dissociation constant [K-d] of 40 mu M). In contrast, the related compound harmalol bound human Hsp90 (HsHsp90) (K-d of 224 mu M) more tightly than PfHsp90 (K-d of 7,010 mu M). Site-directed mutagenesis revealed that Arg98 in PfFisp90 is essential for harmine selectivity. In keeping with our model indicating that Hsp90 inhibition affords synergistic combinations with existing antimalarials, we demonstrated that harmine potentiates the effect of chloroquine and artemisinin in vitro and in the Plasmodium berghei mouse model. These findings have implications for the development of novel therapeutic combinations that are synergistic with existing antimalarials.
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