This family of proteins is found in bacteria, archaea and eukaryotes. Proteins in this family are typically between 558 and 775 amino acids in length. There is a conserved TGG sequence motif. PNGase A is a protein which cleaves glycopeptides.

1: Haemonchus contortus glycoproteins contain N-linked oligosaccharides with novel highly fucosylated core structures. Haslam SM, Coles GC, Munn EA, Smith TS, Smith HF, Morris HR, Dell A; J Biol Chem. 1996;271:30561-30570. PMID:8940027