Catalysis of the reaction: L-glutamine + lipid II + ATP + H2O = L-glutamate + beta-D-GlcNAc(1->4)-Mur2Ac(oyl-L-Ala-D-isoGln-L-Lys-D-Ala-D-Ala)-diphospho-di-trans,octa-cis-undecaprenol + ADP + phosphate.
L-glutamate--lipid II transaminase activity