ID   3.2.1.217
DE   exo-acting protein-alpha-N-acetylgalactosaminidase.
CA   (1) 3-O-[N-acetyl-alpha-D-galactosaminyl]-L-seryl-[protein] + H2O =
CA   L-seryl-[protein] + N-acetyl-D-galactosamine.
CA   (2) 3-O-[N-acetyl-alpha-D-galactosaminyl]-L-threonyl-[protein] + H2O =
CA   L-threonyl-[protein] + N-acetyl-D-galactosamine.
CC   -!- The enzyme, which belongs to the glycosylhydrolase 31 (GH31) family,
CC       is an exo-acting alpha-N-acetylgalactosaminidase that acts on the
CC       innermost alpha-GalNAc residues at the core of O-glycans when no
CC       other saccharides are attached to it.
CC   -!- Unlike EC 3.2.1.49, it is not able to act on blood group A antigen.
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