PER1 is required for GPI-phospholipase A2 activity and is involved in lipid remodelling of GPI-anchored proteins [2]. PER1 is part of the CREST superfamily [3].

1: The unfolded protein response regulates multiple aspects of secretory and membrane protein biogenesis and endoplasmic reticulum quality control. Ng DT, Spear ED, Walter P; J Cell Biol 2000;150:77-88. PMID:10893258

2: PER1 Is Required for GPI-Phospholipase A2 Activity and Involved in Lipid Remodeling of GPI-anchored Proteins. Fujita M, Umemura M, Yoko-O T, Jigami Y; Mol Biol Cell. 2006; [Epub ahead of print] PMID:17021251

3: CREST--a large and diverse superfamily of putative transmembrane hydrolases. Pei J, Millay DP, Olson EN, Grishin NV; Biol Direct. 2011;6:37. PMID:21733186