May play a role in anterograde transport of membrane proteins from the endoplasmic reticulum to the Golgi. May be involved in CASP8-mediated apoptosis. Homodimer and heterodimer with BCAP29. Binds CASP8 (isoform 9) as a complex containing BCAP31, BCAP29, BCL2 and/or BCL2L1. Interacts with VAMP3, VAMP1 and membrane IgD immunoglobulins. May interact with ACTG1 and non-muscle myosin II. Interacts with PTPLB. Ubiquitous. Belongs to the BCAP29/BCAP31 family. 2 isoforms of the human protein are produced by alternative splicing. Note: This description may include information from UniProtKB.
Protein type: Membrane protein, integral; Membrane protein, multi-pass
Cellular Component: cytosol; endoplasmic reticulum; endoplasmic reticulum membrane; integral to plasma membrane; lipid particle; membrane; translocon complex
Molecular Function: protein binding
Biological Process: antigen processing and presentation of peptide antigen via MHC class I; elevation of cytosolic calcium ion concentration; elevation of mitochondrial calcium ion concentration; ER to Golgi vesicle-mediated transport; positive regulation of caspase activity; reduction of endoplasmic reticulum calcium ion concentration