Reaction catalyzed by protein geranylgeranyltransferase type I (2.5.1.59)

		+		Ki-Ras4A	=			+		S-geranylgeranyl-Ki-Ras4A
	geranylgeranyl diphosphate	+		Ki-Ras4A	=		diphosphate	+		S-geranylgeranyl-Ki-Ras4A