Reaction catalyzed by protein geranylgeranyltransferase type I (2.5.1.59)

		+			=			+
	geranylgeranyl diphosphate	+		dansyl-Cys-Ile-Ile-Leu	=		diphosphate	+		dansyl-S-geranylgeranyl-Cys-Ile-Ile-Leu