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