Contributes to UDP-N-acetylglucosamine-lysosomal-enzyme N-acetylglucosaminephosphotransferase activity. Predicted to be involved in carbohydrate phosphorylation. Located in Golgi membrane. Human ortholog(s) of this gene implicated in glycoproteinosis and mucolipidosis III gamma. Orthologous to human GNPTG (N-acetylglucosamine-1-phosphate transferase subunit gamma). [provided by Alliance of Genome Resources, Apr 2022]