Degradation of external UDP-glucose to uridine monophosphate and glucose-1-phosphate, which can then be used by the cell. UDP-sugar + H2O = UMP + alpha-D-aldose 1-phosphate. a ribonucleoside 5'-phosphate + H2O = a ribonucleoside + phosphate Binds 2 Zn(2+) ions per subunit. The activity of this protein is inhibited by an intracellular protein inhibitor. Monomer. Exported from the cell, except a small proportion that is internally localized. Belongs to the 5'-nucleotidase family.