In enzymology, an aldose-1-phosphate nucleotidyltransferase is an enzyme that catalyzes the chemical reaction NDP + alpha-D-aldose 1-phosphate ⇌ {\displaystyle \rightleftharpoons } phosphate + NDP-aldoseThus, the two substrates of this enzyme are NDP and alpha-D-aldose 1-phosphate, whereas its two products are phosphate and NDP-aldose. Wikipedia