Detection of Human/Mouse/Rat FKBP12 by Western Blot. Western blot shows lysates of Neuro-2A mouse neuroblastoma cell line, Jurkat human acute T cell leukemia cell line, and MCF-7 human breast cancer cell line. PVDF membrane was probed with 1 µg/mL Rat Anti-Human/Mouse/Rat FKBP12 Monoclonal Antibody (Catalog # MAB3777) followed by HRP-conjugated Anti-Rat IgG Secondary Antibody (Catalog # HAF005). For additional reference, Recombinant Human FKBP12 (Catalog # 3777-FK), recombinant human FKBP12.6, and recombinant human FKBP13 (5 ng/lane) were included. A specific band for FKBP12 was detected at approximately 12 kDa (as indicated). This experiment was conducted under reducing conditions and using Immunoblot Buffer Group 3.
Preparation and Storage
Reconstitute at 0.5 mg/mL in sterile PBS.
The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below. *Small pack size (SP) is shipped with polar packs. Upon receipt, store it immediately at -20 to -70 °C
Stability & Storage
Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
12 months from date of receipt, -20 to -70 °C as supplied.
1 month, 2 to 8 °C under sterile conditions after reconstitution.
6 months, -20 to -70 °C under sterile conditions after reconstitution.
FK506 binding protein, 12 kilodalton molecular weight (FKBP12), also called FKBP1, was originally characterized as a peptidyl-prolyl isomerase that catalyzes the transition between cis- and trans-proline residues critical for proper folding of proteins. Proline isomerase activity was demonstrated but not used for quality control. The macrolide immunosuppressants FK506 (Tacrolimus) and rapamycin bind to FKBP12 with high affinity, while the structurally related compound cyclosporine binds with a much lower affinity (1). The binding of these drugs causes FKBP12 to become a potent inhibitor of calcineurin phosphatase activity (2) and TOR kinase activity (3). The inhibition of protein phosphatase activity is highly selective for calcineurin (2), making the FK506/FKBP12 complex a useful tool in the study of this enzyme. Knockout mice lacking FKBP12 are morphologically normal, but develop cardiomyopathies that may be related to dysregulation of ryanodyne receptors (4).
Hamilton, G.S. and J.P. Steiner (1998) J. Med. Chem. 41:5119.
Liu, J. et al. (1992) Biochemistry 31:3896.
Toral-Barza, L. et al. (2005) Biochem. Biophys. Res. Comm. 332:304.
Hamilton, S.L and M.M. Matzuk (1998) Nature 391:489.
12 kDa FK506 Binding Protein
Entrez Gene IDs:
2280 (Human); 14225 (Mouse); 25639 (Rat)
12 kDa FKBP; EC 188.8.131.52; FK506 binding protein 1A, 12kDa; FK506-binding protein 1A; FKBP1; FKBP12; FKBP12C; FKBP12FKBP12-Exip3; FKBP-12T-cell, 12-kD; FKBP1a; FKBP-1A; peptidyl-prolyl cis-trans isomerase FKBP1A; PKC12; PPIase FKBP1A; PPIASE; protein kinase C inhibitor 2; rotamase
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