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 ChbABC PTS system is involved in the transport of the chitin disaccharide N,N'-diacetylchitobiose (GlcNAc2). Can also use copper and nickel with lower efficiency. Forms a complex with ChbB (EIIB). ChbA is a homotrimer. By GlcNAc2, GlcNAc3 and beta-N,N'-diacetylchitobiose (Me-TCB). 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.