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 GmuABC PTS system is involved in the transport of oligo-glucomannans such as cellobiose or mannobiose. Up-regulated by konjac glucomannan and by cellobiose and mannobiose, the possible degradation products of glucomannan. Repressed by glucose via the carbon catabolite repression system. Also repressed by GmuR. The PTS EIIA type-3 domain is phosphorylated by phospho-HPr on a histidyl residue. Then, it transfers the phosphoryl group to the PTS EIIB type-3 domain.