|Detection of Human/Mouse/Rat FKBP38 by Western Blot. Western blot shows lysates of HepG2 human hepatocellular carcinoma cell line, NIH‑3T3 mouse embryonic fibroblast cell line, and L6 rat myoblast cell line. PVDF membrane was probed with 0.5 µg/mL of Human/Mouse/Rat FKBP38 Monoclonal Antibody (Catalog # MAB3580) followed by HRP-conjugated Anti-Mouse IgG Secondary Antibody (Catalog # HAF007). A specific band was detected for FKBP38 at approximately 60 to 64 kDa (as indicated). This experiment was conducted under reducing conditions and using Immunoblot Buffer Group 2.|
FK506 Binding Proteins (FKBPs) are intracellular receptors for the immuno-suppressive drug FK506. The FKBP/FK506 complex exerts its immunosuppressive effects by inhibiting calcineurin, a calcium- and calmodulin-dependent serine/threonine phosphatase that functions as a critical signaling molecule during T-cell activation. FKBP38, also known as FKBP8, is a 355 to 412 amino acid (aa) protein with an apparent molecular mass of ~60‑64 kDa in SDS-PAGE. FKBP38 binds to and inhibits calcineurin even in the absence of FK506, indicating that FKBP38 is a constitutively active inhibitor of calcineurin. Additionally, FKBP38 co‑immunoprecipitates with Bcl-2 and Bcl-xL, suggesting that FKBP38 may regulate apoptosis by anchoring Bcl‑2 and Bcl‑xL to mitochondrial membranes. Mouse FKBP38 shares 94% and 87% sequence identity with human and rat FKBP38, respectively.
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