Mammalian PIG-X and yeast PBN1 are essential components of glycosylphosphatidylinositol-mannosyltransferase I [1]. These enzymes are involved in the transfer of sugar molecules.

1: Mammalian PIG-X and yeast Pbn1p are the essential components of glycosylphosphatidylinositol-mannosyltransferase I. Ashida H, Hong Y, Murakami Y, Shishioh N, Sugimoto N, Kim YU, Maeda Y, Kinoshita T; Mol Biol Cell 2005;16:1439-1448. PMID:15635094