label: UDP-D-xylose:beta-D-glucoside alpha-1,3-D-xylosyltransferase activity
label_lc: udp-d-xylose:beta-d-glucoside alpha-1,3-d-xylosyltransferase activity
description: "Catalyzes the reaction: UDP-alpha-D-xylose + [protein with EGF-like domain]-3-O-(beta-D-glucosyl)-L-serine = UDP + [protein with EGF-like domain]-3-O-(alpha-D-xylosyl-(1->3)-beta-D-glucosyl)-L-serine."