The phosphoenolpyruvate-dependent sugar phosphotransferase system (sugar PTS), a major carbohydrate active transport system, catalyzes the phosphorylation of incoming sugar substrates concomitantly with their translocation across the cell membrane. This system is involved in N-acetylglucosamine (GlcNAc) transport. N(pros)-phospho-L-histidyl-[protein] + N-acetyl-D-glucosamine(out) = L-histidyl-[protein] + N-acetyl-D-glucosamine 6-phosphate(in) Induced by GlcNAc. The PTS EIIB type-1 domain is phosphorylated by phospho-EIIA on a cysteinyl residue. Then, it transfers the phosphoryl group to the sugar substrate concomitantly with the sugar uptake processed by the PTS EIIC type-1 domain. Mutant is insensitive to GlcNAc.