GPI (glycosyl phosphatidyl inositol) transamidase is a multi-protein complex. Gpi16, Gpi8 and Gaa1 for a sub-complex of the GPI transamidase. GPI transamidase that adds glycosylphosphatidylinositols (GPIs) to newly synthesised proteins. Gpi16 is an essential N-glycosylated transmembrane glycoprotein. Gpi16 is largely found on the lumenal side of the ER. It has a single C-terminal transmembrane domain and a small C-terminal, cytosolic extension with an ER retrieval motif [1].

1: The GPI transamidase complex of Saccharomyces cerevisiae contains Gaa1p, Gpi8p, and Gpi16p. Fraering P, Imhof I, Meyer U, Strub JM, van Dorsselaer A, Vionnet C, Conzelmann A; Mol Biol Cell 2001;12:3295-3306. PMID:11598210