UTP–hexose-1-phosphate uridylyltransferase

UTP–hex·ose-1-phos·phate uri·dyl·yl·trans·fer·ase (hekґsōs fosґfāt u″rĭ-dil″əl-transґfər-ās) [EC 2.7.7.10] an enzyme of the transferase class that catalyzes the transfer of galactose 1-phosphate to UTP to form UDP-galactose. The reaction is an alternative minor pathway for producing UDP-galactose for galactose utilization (cf. UDP-glucose–hexose-1-phosphate uridylyltransferase). The enzyme is present in the liver of adults, but is lacking in infants. Called also galactose 1-phosphate uridylyltransferase.