Reaction catalyzed by xylosyl alpha-1,3-xylosyltransferase (2.4.2.62)

		+			=			+
	UDP-D-xylose	+		N-pyridin-2-yl-3-O-alpha-D-xylopyranosyl-beta-D-glucopyranosylamine	=		UDP	+		alpha-D-xylopyranosyl-(1-3)-alpha-D-xylopyranosyl-(1-3)-N-pyridin-2-yl-beta-D-glucopyranosylamine