Predicted to enable mannose-ethanolamine phosphotransferase activity. Involved in GPI anchor biosynthetic process. Located in endoplasmic reticulum membrane. Is expressed in several structures, including alimentary system; genitourinary system; nervous system; respiratory system; and skeleton. Orthologous to human PIGO (phosphatidylinositol glycan anchor biosynthesis class O). [provided by Alliance of Genome Resources, Apr 2022]