UDP-6-deoxygalactose inhibits the UDP-galactose 4-epimerase (EC from Escherichia coli in a competitive manner with respect to the substrate UDP-galactose, giving Ki 1.3×10-3m. As a substrate for the enzyme, it is transformed into UDP-6-deoxyglucose, although the reaction stops before equilibrium is attained. Possible causes of this behaviour are discussed.

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