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- W1523133029 abstract "Formycin B is cytotoxic toward Leishmania and is a potential chemotherapeutic agent for leishmaniasis. In order to determine the mechanism of action of formycin B, we have isolated and characterized clonal populations of formycin B-resistant Leishmania donovani. These formycin B-resistant clones are also cross-resistant to formycin A and allopurinol riboside-mediated growth inhibition. Incubation of the formycin B-resistant cells with [3H]formycin B indicates that, unlike wild type cells, the resistant populations cannot accumulate phosphorylated metabolites of exogenous [3H]formycin B. This is due to a defective transport system for formycin B in the resistant cells. However, wild type and mutant cells incorporate [3H]formycin A equally efficiently into [3H]formycin A-containing nucleotides and into RNA. These data suggest that formycin B cytotoxicity in Leishmania is not mediated by its incorporation as the adenosine analog into RNA. A plausible alternative hypothesis is proposed for the mechanism of action of the pyrazolo (4,3-d)pyrimidine C-nucleosides based upon depletion of an essential intracellular metabolite." @default.
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- W1523133029 date "1984-06-01" @default.
- W1523133029 modified "2023-10-16" @default.
- W1523133029 title "Biochemical genetic analysis of formycin B action in Leishmania donovani." @default.
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- W1523133029 doi "https://doi.org/10.1016/s0021-9258(17)42838-9" @default.
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