Involved in the lipid remodeling steps of GPI-anchor maturation. Required for stable expression of GPI-anchored proteins at the cell surface. Interacts with PGAP2IP. Ubiquitously expressed, with highest levels in testis and pancreas. The disease is caused by variants affecting the gene represented in this entry. This isoform is predicted to contain an additional transmembrane domain at position 85-105. If this domain exists, the topology of the protein would be modified, possibly challenging the GPI-anchor remodeling function of the protein. Belongs to the PGAP2 family.