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 alpha-glucoside transport. Involved in the transport and simultaneous phosphorylation at O-6 of the glucosyl moiety of sucrose and its five linkage-isomeric alpha-D-glucosyl-D-fructoses. Can also transport maltose, isomaltose and maltitol, phosphorylating at O-6 of their non-reducing glucose portion. The EIIC domain forms the PTS system translocation channel and contains the specific substrate-binding site. 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.