Reaction catalyzed by GalNAc-alpha-(1->4)-GalNAc-alpha-(1->3)-diNAcBac-PP-undecaprenol alpha-1,4-N-acetyl-D-galactosaminyltransferase (2.4.1.292)

3		+			=	3		+
	3 UDP-N-acetyl-alpha-D-galactosamine	+		GalNAc-alpha-(1->4)-GalNAc-alpha-(1->3)-diNAcBac-PP-tritrans,heptacis-undecaprenol	=		3 UDP	+		[GalNAc-alpha-(1->4)]4-GalNAc-alpha-(1->3)-diNAcBac-PP-tritrans,heptacis-undecaprenol