CSG2 is an integral membrane protein with up to 10 transmembrane segments that, when over-expressed, localises to the endoplasmic reticulum [1,2]. CSG2 is a family of fungal transmembrane proteins that regulate mannosyl phosphorylinositol ceramide synthase and are thereby implicated in calcium homoeostasis in the cell [3].

1: The CLS2 gene encodes a protein with multiple membrane-spanning domains that is important Ca2+ tolerance in yeast. Takita Y, Ohya Y, Anraku Y; Mol Gen Genet. 1995;246:269-281. PMID:7854312

2: A novel protein, CSG2p, is required for Ca2+ regulation in Saccharomyces cerevisiae. Beeler T, Gable K, Zhao C, Dunn T; J Biol Chem. 1994;269:7279-7284. PMID:8125941

3: Csg1p and newly identified Csh1p function in mannosylinositol phosphorylceramide synthesis by interacting with Csg2p. Uemura S, Kihara A, Inokuchi J, Igarashi Y; J Biol Chem. 2003;278:45049-45055. PMID:12954640