Catalysis of the reaction: Mur2Ac(oyl-L-Ala-gamma-D-Glu-L-Lys-D-Ala-D-Ala)-di-trans,octa-cis-undecaprenyl diphosphate + UDP-N-acetyl-alpha-D-glucosamine = beta-D-GlcNAc-(1->4)-Mur2Ac(oyl-L-Ala-gamm-D-Glu-L-Lys-D-Ala-D-Ala)-di-trans,octa-cis-undecaprenyl diphosphate + H+ + UDP.
undecaprenyldiphospho-muramoylpentapeptide b-N-acetylglucosaminyltransferase activity