Component of the coat protein complex II (COPII) which promotes the formation of transport vesicles from the endoplasmic reticulum (ER). The coat has two main functions, the physical deformation of the endoplasmic reticulum membrane into vesicles and the selection of cargo molecules. COPII is composed of at least 5 proteins: the SEC23/24 complex, the SEC13/31 complex and SAR1. Interacts with PDCD6 in a calcium-dependent manner. Interacts with KLHL12. Abundantly and ubiquitously expressed. Belongs to the WD repeat SEC31 family. 8 isoforms of the human protein are produced by alternative splicing. Note: This description may include information from UniProtKB.
Cellular Component: COPII vesicle coat; cytoplasm; cytosol; endoplasmic reticulum; endoplasmic reticulum membrane; ER to Golgi transport vesicle; Golgi membrane; intracellular membrane-bound organelle; perinuclear region of cytoplasm
Molecular Function: calcium-dependent protein binding; protein binding
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; cellular protein metabolic process; COPII coating of Golgi vesicle; ER to Golgi vesicle-mediated transport; post-translational protein modification; protein amino acid N-linked glycosylation via asparagine; protein transport; response to calcium ion; unfolded protein response
Alt. Names/Synonyms: ABP125; ABP130; DKFZp686N07171; HSPC275; HSPC334; KIAA0905; MGC90305; Protein transport protein Sec31A; protein-transport protein SEC31; SC31A; SEC31 homolog A (S. cerevisiae); SEC31-like 1; SEC31-like protein 1; SEC31-related protein A; SEC31A; SEC31L1; Web1-like protein; yeast Sec31p homolog
LTP: The number of records in which this modification site was determined using site-specific methods. SS methods include amino acid sequencing, site-directed mutagenesis, modification site-specific antibodies, specific MS strategies, etc.