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• W2396072373 abstract "The metabolism of [35S]methionine in cultured bloodstream forms of African trypanosomes was followed using flow-through radiodetection linked to liquid chromatography separation. The effects of a transmethylase inhibitor, sinefungin, and of the ornithine decarboxylase inhibitor, DL-alpha-difluoromethylornithine (Ornidyl; DFMO), on methionine metabolism were also observed. Trypanosomes rapidly incorporated [35S]methionine into S-adenosylmethionine (AdoMet) and the metabolites methylthioadenosine, S-adenosylhomocysteine, homocysteine, cystathionine cysteine and glutathione. Untreated trypanosomes excreted large quantities of cystathionine and cysteine into the growth medium. DFMO-treated cells formed larger quantities of AdoMet more rapidly than did control cells, as was evident from initial time points (30 min and 1 h). Decarboxylated AdoMet, present in trace quantities in control cells, accumulated in DFMO-treated cells. Sinefungin increased the AdoMet concentrations approximately 20-fold over that of controls after a 6 h incubation with [35S]methionine, while cystathionine and cysteine levels decreased. The half-life (t1/2) and rate of turnover of AdoMet were measured in cells treated with DFMO or sinefungin. DFMO treatment caused a substantial increase in the rate of AdoMet utilization, while sinefungin extended the t1/2 and lowered AdoMet turnover. These studies show that trypanosomes rapidly metabolize methionine through AdoMet to intermediates of the polyamine and transmethylation pathways. Agents inhibiting these pathways rapidly affect the concentration and rate of utilization of AdoMet, significantly changing the concentrations of metabolites." @default.
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• W2396072373 date "1995-08-01" @default.
• W2396072373 modified "2023-09-27" @default.
• W2396072373 title "Fate of soluble methionine in African trypanosomes: effects of metabolic inhibitors" @default.
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• W2396072373 doi "https://doi.org/10.1042/bj3090737" @default.
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