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1.  α-Ketoheterocycles as inhibitors of Leishmania mexicana cysteine protease CPB 
ChemMedChem  2010;5(10):1734-1748.
Cysteine proteases of the papain superfamily are present in nearly all eukaryotes and also play pivotal roles in the biology of parasites. Inhibition of cysteine proteases is emerging as an important strategy to combat parasitic diseases such as sleeping sickness, Chagas’ disease and leishmaniasis. Inspired by the in vivo antiparasitic activity of the vinyl sulfone based cysteine protease inhibitors (CPIs), a series of α-ketoheterocycles 1-15 has been developed as reversible inhibitors of a recombinant L. mexicana cysteine protease CPB2.8. The isoxazoles 1-3 and especially the oxadiazole 15 are potent reversible inhibitors of CPB2.8, however, in vitro whole-organism screening against a panel of protozoan parasites did not fully correlate with the observed inhibition of the cysteine protease.
doi:10.1002/cmdc.201000265
PMCID: PMC3245848  PMID: 20799311
cysteine proteases; inhibitors; ketoheterocycle; parasite CPB; Trypanosoma

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