UDP-glycosyltransferase activity pentosyltransferase activity 1,4-beta-D-xylan synthase activity https://github.com/geneontology/go-ontology/issues/30193 GO:0047517 EC:2.4.2.24 molecular_function uridine diphosphoxylose-1,4-beta-xylan xylosyltransferase activity xylan synthase activity RHEA:15289 MetaCyc:RXN-9104 Catalysis of the reaction: UDP-D-xylose + [(1->4)-beta-D-xylan](n) = UDP + [(1->4)-beta-D-xylan](n+1). xylan synthetase activity 1,4-beta-xylan synthase activity UDP-D-xylose:1,4-beta-D-xylan 4-beta-D-xylosyltransferase activity