B-cell receptor-associated protein 31 (BCAP31)

Functions as a chaperone protein. Is one of the most abundant endoplasmic reticulum (ER) proteins.

Plays a role in the export of secreted proteins in the ER, the recognition of abnormally folded protein and their targeting to the ER associated-degradation (ERAD). Also serves as a cargo receptor for the export of transmembrane proteins.