Abstract
Dictyostelium discoideum is able to metabolize [1-14C]galactose to 14CO2 despite the observation that galactose is inhibitory with respect to growth. Galactose-1-phosphate uridyl transferase activity is present throughout growth and development and varies in activity only slightly during the entire life cycle of D. discoideum, in contrast to the rapid increase in UDP-glucose 4-epimerase activity during development. Therefore, in D. discoideum, these two enzymes of the Leloir pathway are independently regulated, unlike E. coli where these enzymes are coordinately controlled.
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