Chaperone that plays a key role in various processes such as apoptosis, insertion of tail-anchored (TA) membrane proteins to the endoplasmic reticulum membrane and regulation of chromatin. Acts in part by regulating stability of proteins and their degradation by the proteasome. Participates in endoplasmic reticulum stress-induced apoptosis via its interaction with AIFM1/AIF by regulating AIFM1/AIF stability and preventing its degradation. Also required during spermatogenesis for synaptonemal complex assembly via its interaction with HSPA2, by inhibiting polyubiquitination and subsequent proteasomal degradation of HSPA2. Required for selective ubiquitin-mediated degradation of defective nascent chain polypeptides by the proteasome. In this context, may play a role in immuno-proteasomes to generate antigenic peptides via targeted degradation, thereby playing a role in antigen presentation in immune response. Key component of the BAG6/BAT3 complex, a cytosolic multiprotein complex involved in the post-translational delivery of tail-anchored (TA) membrane proteins to the endoplasmic reticulum membrane. TA membrane proteins, also named type II transmembrane proteins, contain a single C-terminal transmembrane region. BAG6/BAT3 acts by facilitating TA membrane proteins capture by ASNA1/TRC40: it is recruited to ribosomes synthesizing membrane proteins, interacts with the transmembrane region of newly released TA proteins and transfers them to ASNA1/TRC40 for targeting to the endoplasmic reticulum membrane. Component of the BAT3 complex, at least composed of BAG6/BAT3, UBL4A and GET3/TRC35. Interacts with AIFM1, CTCFL, HSPA2 and p300/EP300. Interacts with ricin A chain. Interacts with L.pneumophila proteins Lpg2160 and LegU1. Interacts with NCR3. 3 isoforms of the human protein are produced by alternative splicing. Note: This description may include information from UniProtKB.
Protein type: Apoptosis; Ubiquitin conjugating system; Cell cycle regulation; Chaperone
Chromosomal Location of Human Ortholog: 6p21.3
Cellular Component: nucleus; cytosol
Molecular Function: protein binding; ribosome binding; Hsp70 protein binding; polyubiquitin binding
Biological Process: ubiquitin-dependent protein catabolic process; negative regulation of proteolysis; synaptonemal complex assembly; internal peptidyl-lysine acetylation; protein stabilization; immune system process; chromatin modification; negative regulation of proteasomal ubiquitin-dependent protein catabolic process; regulation of cell proliferation; embryonic development; transport; spermatogenesis; brain development; kidney development; cell differentiation; DNA damage response, signal transduction by p53 class mediator resulting in induction of apoptosis; lung development
SS: 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.