Alpha-1,6-mannosyl-glycoprotein 6-beta-N-acetylglucosaminyltransferase (, N-acetylglucosaminyltransferase V, alpha-mannoside beta-1,6-N-acetylglucosaminyltransferase, uridine diphosphoacetylglucosamine-alpha-mannoside beta1->6-acetylglucosaminyltransferase, UDP-N-acetylglucosamine:alpha-mannoside-beta1,6 N-acetylglucosaminyltransferase, alpha-1,3(6)-mannosylglycoprotein beta-1,6-N-acetylglucosaminyltransferase, GnTV) is an enzyme with systematic name UDP-N-acetyl-D-glucosamine:6-(2-(N-acetyl-beta-D-glucosaminyl)-alpha-D-mannosyl)-glycoprotein 6-beta-N-acetyl-D-glucosaminyltransferase. This enzyme catalyses the following chemical reaction
R represents the remainder of the N-linked oligosaccharide in the glycoprotein acceptor.