Polypeptide N-acetylgalactosaminyltransferase 5 (GALNT5)

Catalyzes the initial reaction in O-linked oligosaccharide biosynthesis, the transfer of an N-acetyl-D- galactosamine residue to a serine or threonine residue on the protein receptor. Has action toward EA2 peptide substrate, but has a weak activity toward Muc2 or Muc1b substrates (By similarity).

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