Members of glycosyltransferase family 8 (GT-8) are involved in lipopolysaccharide biosynthesis and glycogen synthesis. Members of this family are involved in lipopolysaccharide biosynthesis and glycogen synthesis. GT-8 comprises enzymes with a number of known activities: lipopolysaccharide galactosyltransferase, lipopolysaccharide glucosyltransferase 1, glycogenin glucosyltransferase, and N-acetylglucosaminyltransferase. GT-8 enzymes contains a conserved DXD motif which is essential in the coordination of a catalytic divalent cation, most commonly Mn2+.

The C-terminal domain of HUGT1-like is highly homologous to the GT 8 family. C-terminal domain of glycoprotein glucosyltransferase (UGT). UGT is a large glycoprotein whose C-terminus contains the catalytic activity. This catalytic C-terminal domain is highly homologous to Glycosyltransferase Family 8 (GT 8) and contains the DXD motif that coordinates donor sugar binding, characteristic for Family 8 glycosyltransferases. GT 8 proteins are retaining enzymes based on the relative anomeric stereochemistry of the substrate and product in the reaction catalyzed. The non-catalytic N-terminal portion of the human UTG1 (HUGT1) has been shown to monitor the protein folding status and activate its glucosyltransferase activity.