H2O + N-acetyl-D-galactosamine 6-phosphate = acetate + D-galactosamine 6-phosphate In contrast to E.coli strains C and EC3132, K-12 strains cannot grow on N-acetylgalactosamine and D-galactosamine, because they carry a deletion and thus lack active PTS systems specific for these compounds. Therefore, AgaA in K-12 strains is not involved in the degradation of these compounds. Belongs to the metallo-dependent hydrolases superfamily. NagA family. Could be the product of a pseudogene.