Positively stimulates PRMT1-induced protein arginine methylation. Involved in skeletal homeostasis. Positively regulates lysosome peripheral distribution and ruffled border formation in osteoclasts. Interacts (via N- and C-terminus) with DDX1. Interacts (via N- and C-terminus) with C14orf166. Interacts with FAM98B. Interacts with PLEKHM1 (via N- and C-terminus). Belongs to the FAM98 family.