Pho86p is an ER chaperone required for chaperoning multi-pass membrane proteins through the ER membrane compartment [1,2]. It is essential for growth when phosphate levels are limiting [1], being involved in the regulation of Pho84p, a high-affinity phosphate transporter which is localised to the endoplasmic reticulum (ER) in low phosphate medium. When the level of phosphate increases Pho84p is transported to the vacuole. Pho86p is required for packaging of Pho84p in to COPII vesicles [1]. This entry also includes the Uncharacterized protein C12B10.02c from S. pombe (Swiss:Q10436), which is thought to be an orthologue of S. cerevisiae Pho86.

1: Pho86p, an endoplasmic reticulum (ER) resident protein in Saccharomyces cerevisiae, is required for ER exit of the high-affinity phosphate transporter Pho84p. Lau WT, Howson RW, Malkus P, Schekman R, O'Shea EK; Proc Natl Acad Sci U S A. 2000;97:1107-1112. PMID:10655492

2: Specialized membrane-localized chaperones prevent aggregation of polytopic proteins in the ER. Kota J, Ljungdahl PO; J Cell Biol 2005;168:79-88. PMID:15623581