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. The enzyme II complex composed of PtsG and Crr is involved in glucose transport. Also functions as a chemoreceptor monitoring the environment for changes in sugar concentration. It can also phosphorylate mannose, methyl alpha-glucoside and 2-deoxy-glucose. D-glucose(out) + N(pros)-phospho-L-histidyl-[protein] = D-glucose 6-phosphate(in) + L-histidyl-[protein] The EIIB domain is phosphorylated by phospho-EIIA on a cysteinyl or histidyl residue, depending on the transported sugar. Then, it transfers the phosphoryl group to the sugar substrate concomitantly with the sugar uptake processed by the EIIC domain. The EIIC domain forms the PTS system translocation channel and contains the specific substrate-binding site.