Reaction catalyzed by glucuronylgalactosylproteoglycan 4-beta-N-acetylgalactosaminyltransferase (2.4.1.174)

		+			=			+
	UDP-N-acetyl-D-galactosamine	+		beta-D-glucuronyl-(1->3)-D-galactosyl-proteoglycan	=		UDP	+		N-acetyl-D-galactosaminyl-(1->4)-beta-D-glucuronyl-(1->3)-beta-D-galactosylproteoglycan