Enables UDP-glucose:glycoprotein glucosyltransferase activity and unfolded protein binding activity. Predicted to be involved in ER-associated misfolded protein catabolic process and protein N-linked glycosylation via asparagine. Located in endoplasmic reticulum lumen and endoplasmic reticulum-Golgi intermediate compartment. Orthologous to human UGGT1 (UDP-glucose glycoprotein glucosyltransferase 1). [provided by Alliance of Genome Resources, Apr 2022]