Reaction catalyzed by protein geranylgeranyltransferase type I (2.5.1.59)

		+			=			+
	geranylgeranyl diphosphate	+		Phe-Phe-Cys-Ala-Ile-Leu	=		diphosphate	+		Phe-Phe-S-geranylgeranyl-Cys-Ala-Ile-Leu