GlcNAc is an enzyme that carries out the first glycosylation step of hydroxylated Skp1, a ubiquitous eukaryotic protein, in the cytoplasm [1].

1: Molecular cloning and expression of a UDP-N-acetylglucosamine (GlcNAc):hydroxyproline polypeptide GlcNAc-transferase that modifies Skp1 in the cytoplasm of dictyostelium. Van Der Wel H, Morris HR, Panico M, Paxton T, Dell A, Kaplan L, West CM; J Biol Chem. 2002;277:46328-46337. PMID:12244115