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