Required for endoplasmic reticulum (ER) network formation, shaping and remodeling; it links ER tubules to the cytoskeleton. May also enhance the cell surface expression of odorant receptors (PubMed:20200447). May play a role in long-term axonal maintenance (PubMed:24478229). {ECO:0000269|PubMed:20200447, ECO:0000269|PubMed:24478229}. This is the function of Ensembl gene identifier ENSG00000068615 (REEP1, receptor accessory protein 1).