UDP-xylosyltransferase activity xylosyl alpha-1,3-xylosyltransferase activity https://github.com/geneontology/go-ontology/issues/16869 https://github.com/geneontology/go-ontology/issues/30193 molecular_function GO:0140560 pg RHEA:22820 Catalyzes the reaction: UDP-alpha-D-xylose + [protein with EGF-like domain]-3-O-(alpha-D-xylosyl-(1->3)-beta-D-glucosyl)-L-serine = UDP + [protein with EGF-like domain]-3-O-(alpha-D-xylosyl-(1->3)-alpha-D-xylosyl-(1->3)-beta-D-glucosyl)-L-serine. The enzyme, found in animals and insects, is involved in the biosynthesis of the alpha-D-xylosyl-(1->3)-alpha-D-xylosyl-(1->3)- beta-D-glucosyl trisaccharide on epidermal growth factor-like (EGF- like) domains. 2020-11-25T13:45:18Z EC:2.4.2.62