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• W2971843523 abstract "Abstract The cysteine protease cruzipain is considered to be a validated target for therapeutic intervention in the treatment of Chagas disease. A series of 26 new compounds waswere designed, synthesized, and tested against the recombinant cruzain (Cz) to map its S1/S1′ subsites. The same series was evaluated on a panel of four human cysteine proteases (CatB, CatK, CatL, CatS) and Leishmania mexicana CPB, which is a potential target for the treatment of cutaneous leishmaniasis. The synthesized compounds are dipeptidyl nitriles designed based on the most promising combinations of different moieties in P1 (ten), P2 (six), and P3 (four different building blocks). Eight compounds exhibited a K i smaller than 20.0 nM for Cz, whereas three compounds met these criteria for LmCPB. The three inhibitors had an EC 50 value of ca. 4 μM, thus being equipotent to benznidazole according to the anti-trypanosomal effects. Our mapping approach and the respective structure-activity relationships provide insights into the specific ligand-target interactions for therapeutically relevant cysteine proteases. Author Summary Despite many achievements in identifying novel agents for the treatment of tropical and neglected diseases, further research continues to be of fundamental importance. Our research groups have been using the cruzipain cysteine protease in its recombinant form, cruzain (Cz), to identify new trypanocidal agents. Considering the possible interchangeability with other cysteine proteases, the same series of dipeptidyl nitriles was tested in Leishmania mexicana LmCPB. Other potential targets for such inhibitors are human cysteine cathepsins, which are involved in different disease states. Thus, the inhibitors were also tested against cathepsins B, L, K, and S. Our results demonstrate that inhibition of these cysteine proteases can be achieved by appropriate structural modifications of dipeptidyl nitriles. It was also possible to identify trypanocidal agents, equipotent to benznidazole, the current drug of choice used for the treatment of Chagas disease." @default.
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• W2971843523 date "2019-09-08" @default.
• W2971843523 modified "2023-09-26" @default.
• W2971843523 title "Mapping the S1 and S1’ subsites of cysteine proteases with new dipeptidyl nitrile inhibitors as trypanocidal agents" @default.
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• W2971843523 doi "https://doi.org/10.1101/760736" @default.
• W2971843523 hasPublicationYear "2019" @default.
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