The phosphoenolpyruvate-dependent sugar phosphotransferase system (PTS), a major carbohydrate active transport system, catalyzes the phosphorylation of incoming sugar substrates concomitant with their translocation across the cell membrane. The enzyme II complex composed of SrlA, SrlB and SrlE is involved in glucitol/sorbitol transport. Activated by sorbitol and repressed by glucose. The EIIC domain forms the PTS system translocation channel and contains the specific substrate-binding site.