Proline transport in Saccharomyces cerevisiae - PubMed (original) (raw)

Proline transport in Saccharomyces cerevisiae

P F Lasko et al. J Bacteriol. 1981 Oct.

Abstract

The yeast Saccharomyces cerevisiae is capable of utilizing proline as the sole source of nitrogen. Mutants of S. cerevisiae with defective proline transport were isolated by selecting for resistance to either of the toxic proline analogs L-azetidine-2-carboxylate or 3,4-dehydro-DL-proline. Strains carrying the put4 mutation are defective in the high-affinity proline transport system. These mutants could still grow when given high concentrations of proline, due to the operation of low-affinity systems whose existence as confirmed by kinetic studies. Both systems were repressed by ammonium ions, and either was induce by proline. Low-affinity transport was inhibited by histidine, so put4 mutants were unable to grow on a medium containing high concentrations of proline to which histidine has been added.

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