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cDNA from rat cells with reconstitutive galactose-epimerase activity in E. coli.

cDNA 47-3 (1373 bp) was isolated from a L6-Myoblast (rat) library by a selective screening procedure using an UDP-Galactose-4-Epimerase deficient E. coli strain (DC41-2F'). Expression of this cDNA, leads to reconstitution of epimerase activity in strain DC41/2F' and enables it to grow on medium containing phenylgalactoside. Usually this substrate is lethal for bacteria producing lacZ but lacking galE activity (1). The nucleotide sequence of the isolated cDNA has significant homologies to E. coli- (2) and Yeast-Epimerase (3) (GalE and GalIO). Thus, the isolated cDNA should encode an eukaryotic homologue of UDP-Gal-4-Epimerase.