Term Name:	protein guanylyltransferase activity
Synonyms:
Definition:	Catalysis of the reaction: GTP + protein = diphosphate + guanylyl-protein; mediates the addition of an guanylyl (guanosine 5'-monophosphate; GMP group) to specific residues of target proteins.
Ontology:	GO: Molecular Function [GO:0044600]    QuickGO    AmiGO