Abstract
Increased resistance of Plasmodium falciparum to most available drugs challenges the control of malaria. Studies with protease inhibitors have suggested important roles for the falcipain family of cysteine proteases. These enzymes act in concert with other proteases to hydrolyze host erythrocyte hemoglobin in the parasite food vacuole. In order to find potential new antimalarial drugs, we screened in silico the ZINC database using two different protocols involving structure- and ligand-based methodologies. Our search identified 19 novel low micromolar inhibitors of cultured chloroquine resistant P. falciparum. The most active compound presented an IC50 value of 0.5 μM against cultured parasites and it also inhibited the cysteine protease falcipain-2 (IC50 = 25.5 μM). These results identify novel classes of antimalarials that are structurally different from those currently in use and which can be further derivatized to deliver leads suitable for optimisation.
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Acknowledgments
ASN’s work was financially supported by Fundação para a Ciência e Tecnologia, through the doctoral Grant SFRH/BD/41276/2007. GM’s work was financially supported by the South African National Research Foundation (NRF), Medical Research Council, and University of Cape Town. The University of Cape Town, South African Medical Research Council and South African Research Chairs initiative of the Department of Science and Technology administered through the NRF are gratefully acknowledged for support (KC).
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Grace Mugumbate and Ana S. Newton have equally contributed to this work.
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Mugumbate, G., Newton, A.S., Rosenthal, P.J. et al. Novel anti-Plasmodial hits identified by virtual screening of the ZINC database. J Comput Aided Mol Des 27, 859–871 (2013). https://doi.org/10.1007/s10822-013-9685-z
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DOI: https://doi.org/10.1007/s10822-013-9685-z