| Modification Notes |
The glycosylphosphatidylinositol (GPI)-anchored proteins are subjected to lipid remodeling during their biosynthesis. FRAG1 (FGF receptor-activating protein 1), also known as PGAP2 (post-GPI attachment to proteins 2) or CWH43-N (cell wall biogenesis 43 N-terminal homolog), is a 315 amino acid multi-pass membrane protein and a member of the PGAP2 family. Ubiquitously expressed, with highest levels in testis and pancreas, FRAG1 localizes to both the Endoplasmic reticulum and the Golgi apparatus. FRAG1 interacts with PGAP2IP and is involved in the lipid remodeling steps of GPI-anchor maturation. FRAG1 is required for stable expression of GPI-anchored proteins at the cell surface. Existing as three alternatively spliced isoforms, FRAG1 is conserved in chimpanzee, dog and Drosophila melanogaster, and encoded by a gene located on human chromosome 11p15.4. Chromosome 11 is comprised of 135 million base pairs encoding approximately 1,400 genes and makes up around 4% of the human genome. |