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• W2019978136 abstract "Experiments to elucidate the mechanism by which Pneumocystis carinii transports glutamine, leucine, and serine were performed in this study. Uptake of all three radiolabeled amino acids exhibited first-order, saturation kinetics as extracellular substrate concentrations were increased, thus ruling out simple diffusion and indicating carrier-mediated transport. Kinetic analyses of amino acid uptake and the results of competitive inhibition experiments suggested that leucine, serine, and glutamine were taken up via a common transporter system. The uptake of serine was examined in greater detail to characterize the nature of the carrier. Serine uptake was not affected by N, N'-dicyclohexylcarbodiimide, carbonyl cyanide m-chlorophenyl hydrazone, ouabain, gramicidin, valinomycin, sodium azide, salicylhydroxamine acid (SHAM), iodoacetate, iodoacetate plus SHAM, KCN, and azide. Thus serine uptake did not require sodium or energy from ATP, an electrochemical proton gradient or a membrane potential across the cell surface (i.e., proton-motive force). Serine uptake was dependent on glucose in the extracellular compartment. In the presence of glucose, serine uptake was inhibited by chloramphenicol but not cycloheximide. The results from these experiments are most consistent with facilitated diffusion as the mechanism. After 30 min of incubation, most of the radioactivity was in the cellular soluble fraction. In most cases, incorporation into the extractable total lipids and the remaining particulate cellular components were detectable after this incubation period." @default.
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• W2019978136 date "2001-07-01" @default.
• W2019978136 modified "2023-09-24" @default.
• W2019978136 title "Uptake of the Neutral Amino Acids Glutamine, Leucine, and Serine by Pneumocystis carinii" @default.
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• W2019978136 doi "https://doi.org/10.1006/abbi.2001.2389" @default.
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