Reaction catalyzed by lipopolysaccharide heptosyltransferase II (2.4.99.24)

		+			=		ADP	+
	ADP-L-glycero-beta-D-manno-heptose	+		an alpha-Hep-(1->5)-[alpha-Kdo-(2->4)]-alpha-Kdo-(2->6)-[lipid A]	=		ADP	+		an alpha-Hep-(1->3)-alpha-Hep-(1->5)-[alpha-Kdo-(2->4)]-alpha-Kdo-(2->6)-[lipid A]