Abstract
Leishmaniasis is an infectious disease caused by parasites of the genus Leishmania and transmitted by the bite of a sand fly. To date, most available drugs for treatment are toxic and beyond the economic means of those affected by the disease. Protein disulfide isomerase (PDI) is a chaperone protein that plays a major role in the folding of newly synthesized proteins, specifically assisting in disulfide bond formation, breakage, or rearrangement in all non-native proteins. In previous work, we demonstrated that Leishmania major PDI (LmPDI) has an essential role in pathogen virulence. Furthermore, inhibition of LmPDI further blocked parasite infection in macrophages. In this study, we utilized a computer-aided approach to design a series of LmPDI inhibitors. Fragment-based virtual screening allowed for the understanding of the inhibitors’ modes of action on LmPDI active sites. The generated compounds obtained after multiple rounds of virtual screening were synthesized and significantly inhibited target LmPDI reductase activity and were shown to decrease in vitro parasite growth in human monocyte-derived macrophages. This novel cheminformatics and synthetic approach led to the identification of a new series of compounds that might be optimized into novel drugs, likely more specific and less toxic for the treatment of leishmaniasis.
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All data and material used in this study is available.
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The “Small-Molecule Drug Discovery Suite v. 2014” Software package of Schrödinger was used in the study.
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This work was funded by an Internal Grant of the Arabian Gulf University.
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by NBK, SP, SA, GR, SI, LS, PS, JG, DJP, DMF, IH and VP. The first draft of the manuscript was written by NBK, SP, IH and VP, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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PBMCs were isolated from blood of healthy, unidentified donors of both sexes procured from United Blood services (Approved contract #120913, Dr. Douglas Perkins, UNM HSC). This study was performed in line with the principles of the Declaration of Helsinki. Approval was granted by the Ethics Committee of University of New Mexico.
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Ben Khalaf, N., Pham, S., Romeo, G. et al. A computer-aided approach to identify novel Leishmania major protein disulfide isomerase inhibitors for treatment of leishmaniasis. J Comput Aided Mol Des 35, 297–314 (2021). https://doi.org/10.1007/s10822-021-00374-w
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DOI: https://doi.org/10.1007/s10822-021-00374-w