Required for endoplasmic reticulum (ER) network formation, shaping and remodeling. May enhance the cell surface expression of odorant receptors (By similarity). Interacts with odorant receptor proteins. Detected in brain, heart and skeletal muscle, and at low levels in placenta, kidney and pancreas (PubMed:11161817). Expressed in circumvallate papillae (PubMed:16720576). The disease is caused by variants affecting the gene represented in this entry. Belongs to the DP1 family.