BAG family molecular chaperone regulator 4 (BAG4)

BAG family molecular chaperone regulator 4 (BAG4, also known as Silencer of death domains or SODD) is a member of the BAG protein family that acts as a co-chaperone and regulatory protein in human cells. It contains a C-terminal BAG domain that interacts with Hsc70/Hsp70 heat shock proteins, inhibiting their chaperone activity by promoting substrate release[1][3][6]. BAG4 is also known for binding to and masking the death domains of tumor necrosis factor receptor type 1 (TNF-R1) and death receptor-3 (DR3), thereby inhibiting constitutive or ligand-independent signaling and negatively regulating downstream apoptotic pathways[1][3][5][6]. Its anti-apoptotic role has been associated with cancer progression, metastasis, and cell survival, particularly through activation of proliferative survival pathways such as PI3K/AKT/NF-κB[4]. There are currently no established drugs directly targeting BAG4, and clinical biomarkers or safety issues specific to this protein have not been established in the current literature.

Other names

Silencer of death domainsSODDBcl-2-associated athanogene 4BAG-4