UDP-GalNAc (UDP-N-acetyl-D-galactosamine) disodium, a sugar nucleotide, serves as a substrate for EpsC115, an exopolymeric substances (EPS) N-terminal deletion mutant characterized by the absence of residues 1-115. Additionally, UDP-GalNAc acts as the donor substrate for numerous N-acetylgalactosaminyltransferases. These enzymes facilitate the transfer of GalNAc from the nucleotide sugar to various saccharide or peptide acceptors [1].