Does not seem to be a disulfide isomerase. Plays an important role in the processing of secretory proteins within the endoplasmic reticulum (ER), possibly by participating in the folding of proteins in the ER.
Subcellular locations: Endoplasmic reticulum lumen, Melanosome
Identified by mass spectrometry in melanosome fractions from stage I to stage IV.
Ubiquitous. Mostly expressed in secretory tissues.