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 (By similarity). Involved in galactose transport with PtcB and Lmg_0963 (PubMed:30123211). Binds 1 Mg(2+) ion per trimer. Homotrimer. Induced by growth on galactose. 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.