undecaprenyldiphospho-muramoylpentapeptide beta-N-acetylglucosaminyltransferase activity
UDP-N-acetyl-D-glucosamine:N-acetyl-alpha-D-muramyl(oyl-L-Ala- gamma-D-Glu-L-Lys-D-Ala-D-Ala)-diphosphoundecaprenol beta-1,4-N-acetylglucosaminlytransferase activity