title: Absence of derepression of amino acids transport in Candida.
abstract: The transport of glycine, L-alanine, L-proline, L-leucine, L-lysine, L-phenylalanine and L-glutamic acid did not enhance in various strains of Candida cells, when they were grown in proline containing medium or preincubated with proline. However, under similar conditions, a significant enhancement in the level of accumulation of amino acids (derepression) was observed in Saccharomyces cerevisiae X-2180-A2 (GAP+) cells, which was sensitive to ammonium ions (NH4+). As expected, the derepression was absent in GAP- cells of S. cerevisiae X-2180 (GAP- mutant). In contrast to S. cerevisiae (GAP+) cells, the increase in few amino acids uptake in different Candida strains, grown in proline or preincubated in proline, could not be inhibited by cycloheximide, NH4+ or their D-stereoisomers. It appears that derepression of amino acids transport, a well known phenomenon in S. cerevisiae, may not exist in Candida species.
mesh_terms: D000596:Amino Acids / Q000378:metabolism*; D001692:Biological Transport; D002175:Candida / Q000378:metabolism*; D002176:Candida albicans / Q000378:metabolism; D011392:Proline / Q000378:metabolism; D012441:Saccharomyces cerevisiae / Q000378:metabolism; D013045:Species Specificity
chemical_list: D000596:Amino Acids; D011392:Proline