Abstract
The steady-state levels of distribution of glycine,l-aspartic acid,l-leucine and, to a lesser extent, ofl-lysine andl-methionine, in actidione-treated baker’s yeast cells are significantly altered (usually decreased) in the presence ofd-glucose,d-mannose,d-fructose, 2-deoxy-d-glucose, maltose, sucrose and, after induction,d-galactose. Stimulatory effects ofd-ribose,l-sorbose andd-xylose are not highly significant. Pronounced effects of sugars were also found anaerobically. No effect of amino acids on sugar uptake was observed. Three types of interaction appear to be present: (1) increase of energy reserves by metabolized sugars; (2) increased rate of carrier breakdown in the presence of metabolized sugars; (3) interaction at the carrier level in a “heteropolyvalent” membrane complex.
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