L-threonyl-[protein] + UTP => uridylyl-L-threonyl-[protein] + diphosphate
l-threonyl-[protein] + utp => uridylyl-l-threonyl-[protein] + diphosphate
L-threonyl-[protein] + UTP => uridylyl-L-threonyl-[protein] + diphosphate
l-threonyl-[protein] + utp => uridylyl-l-threonyl-[protein] + diphosphate