Domain of unknown function (DUF3492). This presumed domain is functionally uncharacterized. This domain is found in bacteria, archaea and eukaryotes. This domain is typically between 259 to 282 amino acids in length. This domain is found associated with pfam00534. This domain has two conserved sequence motifs: GGVS and EHGIY.

glycosyltransferase family 4 proteins. This family is most closely related to the GT4 family of glycosyltransferases. Glycosyltransferases catalyze the transfer of sugar moieties from activated donor molecules to specific acceptor molecules, forming glycosidic bonds. The acceptor molecule can be a lipid, a protein, a heterocyclic compound, or another carbohydrate residue. This group of glycosyltransferases is most closely related to the previously defined glycosyltransferase family 1 (GT1). The members of this family may transfer UDP, ADP, GDP, or CMP linked sugars. The diverse enzymatic activities among members of this family reflect a wide range of biological functions. The protein structure available for this family has the GTB topology, one of the two protein topologies observed for nucleotide-sugar-dependent glycosyltransferases. GTB proteins have distinct N- and C- terminal domains each containing a typical Rossmann fold. The two domains have high structural homology despite minimal sequence homology. The large cleft that separates the two domains includes the catalytic center and permits a high degree of flexibility. The members of this family are found mainly in bacteria, while some of them are also found in Archaea and eukaryotes.

GT4 family glycosyltransferase PelF. Proteins of this family are components of the exopolysaccharide Pel transporter. It has been reported that PelF is a soluble glycosyltransferase that uses UDP-glucose as the substrate for the synthesis of exopolysaccharide Pel, whereas PelG is a Wzx-like and PST family exopolysaccharide transporter.