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• W2071762189 abstract "Midlogarithmic phase Leishmania donovani promastigotes accumulate 2-deoxy-D-glucose (2-dGlc) and L-proline, maintaining concentration gradient factors across the surface membrane of 78.7 and 60, respectively. Cyanide (1 mM) and iodoacetate (0.5 mM) inhibited the transport of both substrates. L-proline uptake was also inhibited by 2-dGlc (10 mM). Transport of neither substrate was affected by Na+, phlorizin, or ouabain, indicating the sodium-independent transport of both systems. However, N',N'-dicyclohexylcarbodiimide (DCCD; 20 microM) significantly inhibited the transport of both 2-dGlc and L-proline (70% and 90%, respectively). The ionophores valinomycin (1 microM) and nigericin (5 microM) each partially inhibited the uptake of both substrates. In parallel experiments, nigericin and valinomycin were added concomitantly to promastigotes, each at a concentration that individually inhibited the transport of 2-dGlc and L-proline by less than 30%. Under such conditions, the transport of 2-dGlc and L-proline was inhibited by 69% and 78%, respectively. However, these ionophores had no significant effect on the promastigotes cellular ATP level. Carbonylcyanide p-(trifluoromethoxy)phenylhydrazone (FCCP; 1 microM) inhibited 2-dGlc (79%) and L-proline (85%) transport, whereas ATP levels of such cells were diminished by only 20%. Symport of D-glucose/H+ and L-proline/H+ was measured directly in cells pretreated with KCN and DCCD. Upon addition of D-glucose to such cells, a rapid movement of protons into the organisms occurred and was reversed upon addition of FCCP. Conversely, no proton movement was observed when L-glucose was added to such cells. L-proline, as D-glucose, caused a rapid influx of protons into the promastigotes, indicating that both substrates were cotransported with protons. We conclude that transport of D-glucose and L-proline in L. donovani promastigotes is protonmotive force-driven and is coupled to both delta pH and delta psi." @default.
• W2071762189 created "2016-06-24" @default.
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• W2071762189 date "1985-03-01" @default.
• W2071762189 modified "2023-10-15" @default.
• W2071762189 title "Protonmotive force-driven active transport of D-glucose and L-proline in the protozoan parasite Leishmania donovani." @default.
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• W2071762189 doi "https://doi.org/10.1073/pnas.82.6.1716" @default.
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