Predicted to enable mannosyltransferase activity. Predicted to be involved in GPI anchor biosynthetic process. Predicted to be located in endoplasmic reticulum and membrane. Predicted to be integral component of membrane. Predicted to be part of glycosylphosphatidylinositol-mannosyltransferase I complex. Is expressed in several structures, including alimentary system; aorta; genitourinary system; nervous system; and thymus. Orthologous to human PIGM (phosphatidylinositol glycan anchor biosynthesis class M). [provided by Alliance of Genome Resources, Apr 2022]