Reaction catalyzed by protein geranylgeranyltransferase type I (2.5.1.59)

		+			=			+
	geranylgeranyl diphosphate	+		Asp-Asp-Pro-Thr-Ala-Ser-Ala-Cys-Val-Leu-Leu	=		Asp-Asp-Pro-Thr-Ala-Ser-Ala-(S-geranylgeranyl)-Cys-Val-Leu-Leu	+		diphosphate