Tags: Enzyme.
In enzymology a mannotetraose 2-alpha-N-acetylglucosaminyltransferase (EC 2.4.1.138) is an enzyme that catalyzes the chemical reactionUDP-N-acetyl-D-glucosamine + 13-alpha-D-mannosyl-12-alpha-D-mannosyl-12-alpha-D-mannosyl-D-mannose UDP + 13-alpha-D-mannosyl-12-(N-acetyl-alpha-D-glucosaminyl-alpha-D-mannosyl)-12-alpha-D-mannosyl-D-mannoseThe 2 substrates of this enzyme are UDP-N-acetyl-D-glucosamine and 13-alpha-D-mannosyl-12-alpha-D-mannosyl-12-alpha-D-mannosyl-D-mannose whereas its 2 products are UDP and 13-alpha-D-mannosyl-12-(N-acetyl-alpha-D-glucosaminyl-alpha-D-mannosyl)-12-alpha-D-mannosyl-D-mannose.This enzyme belongs to the family of glycosyltransferases specifically the hexosyltransferases.