Catalysis of the reaction: chitobiose + phosphate = N-acetyl-D-glucosamine + N-acetyl-alpha-D-glucosamine 1-phosphate. This reaction is the phosphorolysis of chitobiose, (GlcNAc)2, a dimer of beta-(1->4) linked glucosamine units.
Source:
GOC:mengo_curators,
Wikipedia:chitobiose,
PMID:15274915