Relationship between low- and high-affinity glucose transport systems of Saccharomyces cerevisiae

The high-affinity glucose transport process in Saccharomyces cerevisiae whole cells was regulated by catabolite repression and inactivation. The low-affinity process was constitutive, and its activity was inhibited in proportion to the extent of derepression of the high-affinity process. The latter finding suggests that there is some regulatory relationship between the two processes.