Development of a highly selective Plasmodium falciparum proteasome inhibitor with anti-malaria activity in humanized mice.
2021
Plasmodium falciparum proteasome (Pf20S) inhibitors are active against Plasmodium at multiple stages - erythrocytic stages, gametocyte stages, liver stages and gamete activation, indicating that selective Pf20S inhibitors possess the potential to be therapeutic, prophylactic and transmission-blocking antimalarials. Starting from a reported compound, we developed a noncovalent, macrocyclic peptide inhibitor of the malarial proteasome with high species selectivity and improved pharmacokinetic properties. The compound demonstrates specific, time-dependent inhibition of the b5 subunit of the Plasmodium falciparum proteasome, kills artemisinin-sensitive and artemisinin-resistant P. falciparum isolates in vitro and reduces parasitemia in humanized, P. falciparum -infected mice.
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