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: Golgi membrane; endoplasmic reticulum membrane; intracellular membrane-bound organelle; COPII vesicle coat; endoplasmic reticulum; perinuclear region of cytoplasm; cytoplasm; cytosol; ER to Golgi transport vesicle
Molecular Function: protein binding; calcium-dependent protein binding
Biological Process: COPII coating of Golgi vesicle; antigen processing and presentation of peptide antigen via MHC class I; protein transport; ER to Golgi vesicle-mediated transport; unfolded protein response, activation of signaling protein activity; cellular protein metabolic process; unfolded protein response; antigen processing and presentation of exogenous peptide antigen via MHC class II; protein amino acid N-linked glycosylation via asparagine; post-translational protein modification; response to calcium ion
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.