Abstract
Uridine-diphosphogalactose-4-epimerase has been shown to be an adaptive enzyme in Saccharomyces fragilis as well as in S. cerevisiae. The two other enzymes of the galactose-pathway, galactokinase and galactose-1-phosphate-transuridylase are also formed adaptively in response to galactose in these two yeast species. On the contrary, UDPG-pyrophosphorylase, responsible for the formation of uridine-diphosphogalactose (catalytical amounts of which are necessary for the over-all inversion process) is a constitutive enzyme.
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