In enzymology, a glycoprotein 2-beta-D-xylosyltransferase is an enzyme that catalyzes the chemical reaction UDP-D-xylose + N4-{N-acetyl-beta-D-glucosaminyl-(1->2)-alpha-D-mannosyl-(1->3)-[N- acetyl-beta-D-glucosaminyl-(1->2)-alpha-D-mannosyl-(1->6)]-beta-D- mannosyl-(1->4)-N-acetyl-beta-D-glucosaminyl-(1->4)-N-acetyl-beta-D- glucosaminyl}asparagine UDP + N4-{N-acetyl-beta-D-glucosaminyl-(1->2)-alpha-D-mannosyl-(1->3)-[N- acetyl-beta-D-glucosaminyl-(1->2)-alpha-D-mannosyl-(1->6)]-[beta-D- xylosyl-(1->2)]-beta-D-mannosyl-(1->4)-N-acetyl-beta-D-glucosaminyl- (1->4)-N-acetyl-beta-D-glucosaminyl}asparagine The 5 substrates of this enzyme are UDP-D-xylose,, [[Acetyl-beta-D-glucosaminyl-(1->2)-alpha-D-mannosyl-(1->6)]-beta-D-|acetyl-beta-D-glucosaminyl-(1->2)-alpha-D-mannosyl-(1->6)]-beta-D-]],, and, whereas its 5 products are UDP,, [[Acetyl-beta-D-glucosaminyl-(1->2)-alpha-D-mannosyl-(1->6)]-[beta-D-|acetyl-beta-D-glucosaminyl-(1->2)-alpha-D-mannosyl-(1->6)]-[beta-D-]], [[Xylosyl-(1->2)]-beta-D-mannosyl-(1->4)-N-acetyl-beta-D-glucosaminyl-|xylosyl-(1->2)]-beta-D-mannosyl-(1->4)-N-acetyl-beta-D-glucosaminyl-]], and ...