Reaction catalyzed by UDP-D-xylose:beta-D-glucoside alpha-1,3-D-xylosyltransferase (2.4.2.42)

		+			=			+
	UDP-D-xylose	+		Glcbeta-Ser53-EGF-like domain of bovine factor IX(45-87)	=		UDP	+		Xylalpha(1-3)Glcbeta-Ser53-EGF-like domain of bovine factor IX(45-87)