Galactitol-1-phosphate 5-dehydrogenase

In enzymology, a galactitol-1-phosphate 5-dehydrogenase is an enzyme that catalyzes the chemical reaction

galactitol-1-phosphate + NAD+ rightleftharpoons L-tagatose 6-phosphate + NADH + H+

Thus, the two substrates of this enzyme are galactitol-1-phosphate and NAD+, whereas its 3 products are L-tagatose 6-phosphate, NADH, and H+.

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 galactitol-1-phosphate:NAD+ oxidoreductase. This enzyme participates in galactose metabolism. It employs one cofactor, zinc.


  • Nobelmann B, Lengeler JW "Sequence of the gat operon for galactitol utilization from a wild-type strain EC3132 of Escherichia coli". Biochim. Biophys. Acta. 1262 69–72.

External links

The CAS registry number for this enzyme class is .

Gene Ontology (GO) codes

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