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- W2116778920 abstract "In the yeast Saccharomyces cerevisiae, there is a general amino acid permease, regulated by nitrogen catabolite repression, and several specific permeases whose nitrogen regulation is not well understood. In this study, we used continuous cultures to analyse the effect of nitrogen limitation and pH on the activity of general and several specific amino acid permeases. General permease activity was maximal in severe nitrogen limitation and diminished 400-fold in cells grown under nitrogen excess. For the specific permeases, the maximal uptake activity was found between mild limitation and nitrogen excess, while very small activity was detected under strict limitation. These results indicate that the nitrogen regulation of the general and the specific amino acid carriers is coordinated in such a way that no redundancy exists in amino acid transport. The regulation of the specific permeases was similar to that found for a system with anabolic function in nitrogen metabolism. All of these permeases are supposed to work through a proton symport mechanism, and thus rely on pH gradients to carry out their function. We studied the effect of pH on the kinetic constants of the general permease. Our results show that the effect of pH on the Km was different for acidic, neutral and basic amino acids, while the effect on Vmax was independent of the electrical charge of the amino acids." @default.
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- W2116778920 date "1993-10-01" @default.
- W2116778920 modified "2023-10-05" @default.
- W2116778920 title "Regulation of the amino acid permeases in nitrogen-limited continuous cultures of the yeastSaccharomyces cerevisiae" @default.
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- W2116778920 doi "https://doi.org/10.1002/yea.320091005" @default.
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