Predicted to enable dolichyl-diphosphooligosaccharide-protein glycotransferase activity. Predicted to be involved in cellular protein metabolic process; glycoprotein catabolic process; and response to unfolded protein. Predicted to be located in endoplasmic reticulum. Predicted to be part of oligosaccharyltransferase complex. Human ortholog(s) of this gene implicated in congenital disorder of glycosylation Ix. Orthologous to human STT3B (STT3 oligosaccharyltransferase complex catalytic subunit B). [provided by Alliance of Genome Resources, Apr 2022]