Required for MUC2 post-transcriptional synthesis and secretion. May play a role in the production of mucus by intestinal cells. Proto-oncogene that may play a role in cell migration, cell differentiation and cell growth (By similarity). Promotes cell adhesion (By similarity). Monomer and homodimer. Interacts with LYPD3 and DAG1 (alphaDAG1). Interacts with MUC2; disulfide-linked. Belongs to the AGR family.