Component of the COPII coat, that covers ER-derived vesicles involved in transport from the endoplasmic reticulum to the Golgi apparatus. COPII acts in the cytoplasm to promote the transport of secretory, plasma membrane, and vacuolar proteins from the endoplasmic reticulum to the Golgi complex. COPII is composed of at least five proteins: the Sec23/24 complex, the Sec13/31 complex and Sar1. Interacts with SEC23IP. Interacts with HTR4. Interacts with SLC6A4. Interacts with SEC16A. Belongs to the SEC23/SEC24 family. SEC23 subfamily. Note: This description may include information from UniProtKB.
Biological Process: antigen processing and presentation of exogenous peptide antigen via MHC class II; antigen processing and presentation of peptide antigen via MHC class I; COPII coating of Golgi vesicle; ER to Golgi vesicle-mediated transport; vesicle-mediated transport