catalytic activity:UDP-N-acetyl-D-glucosamine + N-acetyl-D-glucosaminyl-diphosphodolichol = UDP + N,N'-diacetylchitobiosyl-diphosphodolichol.,function:Involved in protein N-glycosylation. Essential for the second step of the dolichol-linked oligosaccharide pathway.,online information:GlycoGene database,similarity:Belongs to the glycosyltransferase 28 family.,subunit:Heterodimer with ALG14 to form a functional enzyme.,
[Isoform 2]: Endoplasmic reticulum . Could be recruited to the cytosolic face of the endoplasmic reticulum membrane through its interaction with ALG14.