Reaction catalyzed by dolichyl-P-Man:Man5GlcNAc2-PP-dolichol alpha-1,3-mannosyltransferase (2.4.1.258)

		+			=			+
	GDP-alpha-D-mannose	+		Manalpha(1-2)Manalpha(1-2)Manalpha(1-3)(Manalpha(1-6))Manbeta(1-4)GlcNAcbeta(1-4)GlcNAc-PP-dolichol	=		GDP	+		Manalpha(1-2)Manalpha(1-2)Manalpha(1-3)(Manalpha(1-3)Manalpha(1-6))Manbeta(1-4)GlcNAcbeta(1-4)GlcNAc-PP-dolichol