This enzyme belongs to the family of oxidoreductases, specifically those acting on the CH-OH group of donor with NAD+ or NADP+ as acceptor. The systematic name of this enzyme class is dTDP-D-galactose:NADP+ 6-oxidoreductase. This enzyme is also called thymidine-diphosphate-galactose dehydrogenase. This enzyme participates in nucleotide sugars metabolism.
References
Katan R, Avigad G (1966). "NADP dependent oxidation of TDP-glucose by an enzyme system from sugar beets". Biochem. Biophys. Res. Commun. 24 (1): 18–24. doi:10.1016/0006-291X(66)90403-7. PMID4381717.